Enhanced recovery methods for obtaining hydrocarbons (E21B43/16)

E   Fixed constructions(158735)
E21B43        Obtaining fluids from wells(11343)
E21B43/16                     Enhanced recovery methods for obtaining hydrocarbons (fracturing e21b0043260000; obtaining slurry e21b0043290000; reclamation of contaminated soil in situb09c)(465)

ethod to increase formation hydrocarbon yield and intensify oil-gas-condensate production by means of formation radial penetration with water jet // 2642194
FIELD: oil and gas industry.SUBSTANCE: method includes installing into the well a high-strength tubing, a diverter with inner channel extending therethrough, tying and possible thereof orientation in space in the interval of the lower level drilling of lateral wellbores, sealing the wellhead, installing downhole equipment comprising a water jet nozzle, control unit of the wellbore path, navigation system, working flexible tubing, a device for redistribution of flow, return valve feeding the flexible tubing, supplying liquid into the inter-string area of the tubing/flexible tubing, moving the water jet nozzle through the sealing device. Through the diverter, in contact with rock, drilling of planned length radial wellbore is conducted using the navigation system for monitoring actual position of the wellbore in the formation, and with using the control unit of the wellbore path to provide wellbore drilling along the planned path. After driving the working flexible tubing string with the nozzle through the formation, removal from the formation and well flushing is carried out up to complete discharge of slime. By actuation of the mechanical turning device, the diverter is moved to another plane. The work cycle is repeated for the next lateral wellbore. Milling of a separate port for each lateral wellbore is carried out immediately before performing the main operation for driving lateral wellbores through the diverter. When drilling the lateral wellbore, the wellbore path is determined and changed by supplying the working flexible tubing with wellbore path control unit and the navigation equipment. In order to perform drilling of radial wellbores at the following levels, the supply and working flexible tubing is extracted from the well, tubing is removed from the mechanical anchor, fitting pipe of the tubing that was preinstalled and equal to the length of the transition to the next level is removed, the tubing is seated on the mechanical anchor, and the working flexible tubing with navigation system, control unit of the wellbore path, water jet nozzle is run in into well, after that the operation for drilling of radial wellbores is repeated.EFFECT: increased productivity of wells and hydrocarbons recovery factor, possibility to conduct address action on the formation, possibility to conduct intensification without effecting on string cement support with considerable pressure drop and chemical destruction, possibility to stimulate the formation by a significant pressure drop or chemical failure, cleaning the wellbore when drilling thereof.3 cl, 2 dwg
ethod and device for recovery of horizontal well production and effect on formation // 2640846
FIELD: oil and gas industry.SUBSTANCE: method for recovery of horizontal well production and effect on formation includes the following steps. A complex device is first run into the horizontal wellbore consisting of a ground multifunctional control panel and control, and downhole acoustic radiator connected by a hose-cable of radial-type, a unit of geophysical instruments and an electro-hydraulic radiator with plasma discharger connected therebetween by geophysical adapters. Before completion of horizontal section, the instruments are tied by the geophysical unit. After that, the readings of downhole parameters are taken before treatment, the formation pores and the filters of the horizontal well section are cleaned acoustically. Plasma treatment of the cleaned section is carried out in order to involve dead formation zones by the source. Then, actual parameters are taken by the geophysical unit and the processes are repeated until the horizontal section of the well is covered completely. Electric hydraulic emitter is configured as a modular design and comprises a stabilisation unit, a capacitor bank, and a plasma discharger. The stabilisation unit contains a step-up-decoupling transformer which also supplies power to discharge gap plasma ignition unit. Plasma discharger consists of a body with inner cavity, whose upper part is connected to the connecting bushing, and the lower part is connected to the supporting bushing. In the body cavity there is a cylinder fixed on the middle part of the supporting bushing. The cylinder contains a piston with a rod, and a spring. Wire feed mechanism is secured in the upper part of the piston. The wire feed mechanism is in the form of a lever with a supporting platform and a link with spring. Directed incisions are made on the supporting platform and on the link from the side facing the wire. Four rods are attached to the cylinder that serve as a base for a coil fastening unit. The holes are made in the supporting bushing for arrangement and attachment of negative and positive electrodes. The electrodes are insulated with open sections providing plasma discharge. The negative electrode has an axial hole for passing the wire. A guide cone is fixed on the supporting bushing by means of posts.EFFECT: improved cleaning of bottomhole formation zone, increased well production rate.12 cl, 4 dwg

Formations electric fracturing // 2640520
FIELD: oil and gas industry.SUBSTANCE: method is carried out in formations with a low permeability. The initial permeability of the formation is less than 10 mD. A pair of electrodes is set. Various voltages are supplied between pairs of electrodes of specified frequency. In this case, the potential difference is more than at least 10000 V. The potential difference between the pairs of electrodes is provided by pulses of less than 500 ns duration with the formation of plasma discharges. Rock mass is removed between electrodes to reduce stress in formation by at least 5% of initial voltage in formation. Due to electric arc, rock is removed in local area with formation of channels.EFFECT: increased permeability of formations.18 cl, 5 dwg

ethod for development of nonuniform permeability reservoirs // 2639341
FIELD: oil and gas industry.SUBSTANCE: method involves injecting aqueous suspension of pre-crosslinked polymer into the formation. For this purpose, a brand of pre-crosslinked polymer and processing technological parameters are selected taking into account individual geological and physical characteristics of the facility. Initial suspension of the pre-crosslinked polymer is prepared on the well by mixing at least two volumes of water and one volume of reagent, which is particles with initial size from 0.1 to 10 mm. After maturation for not more than 120 min the produced suspension is stirred in tank with water and pumped into injection well in working concentration of 0.1-0.5%. When pumping, the suspension of reagent particles is maintained in suspended state. At the same time, it prevents filtration of reagent particles into low- permeability portion of the reservoir due to initial sizes of reagent particles and their subsequent swelling. The range of permeability threshold below which the reagent is not filtered into the formation is permitted from 200 to 500 md depending on initial fraction and swelling value. Reagent concentration is controlled depending on reagent injection pressure.EFFECT: increased efficiency when developing non-uniform permeability reservoirs with water drive operation mode due to additional oil production, reduced or stabilized rate of water content growth.6 cl, 7 dwg, 1 tbl

Production cluster for production and processing of gas condensate of shelf field // 2635799
FIELD: oil and gas industry.SUBSTANCE: production cluster for production and processing of shelf field gas condensate combines straight and non-return links of the underwater production complex. This complex is located on gas condensate shelf field. The gas-processing complex is located on the coastal part of the continental shelf and includes a block for receiving produced gas-condensate mixture, a block of gas condensate low-temperature separation, and a block of gas condensate low-temperature separation, a unit for stabilizing and separating unstable condensate and a compressor station unit connected by pipelines. In this case, it is possible to mix commercial gas with compressed gases for stabilisation and use as domestic and industrial fuel gas or as feedstock for the plant to be included in the gas-processing complex for production of export liquefied natural gas and/or gas-chemical plant.EFFECT: increased production efficiency and processing of shelf field gas condensate.12 cl, 1 dwg

ethod of automatic distribution of total gas flow through pressure wells in water-gas method effect on formation // 2634754
FIELD: oil and gas industry.SUBSTANCE: invention relates to the oil and gas industry, in particular, to methods to methods for automatic control of the system for maintaining formation pressure during water-gas effect on the formation, and can be used for automatic distribution of the total gas flow between the pressure wells. The method determines integral volume of gas to be pumped into the pressure wells on the basis of gas flow rate measurement at the inlet to the system for maintaining the formation pressure. The total volume of gas to be distributed is determined by the difference between the integral volume of injection and target gas flow rates of those wells, for which the accounting flag is set to zero. After that the obtained total volume of gas is distributed between those pressure wells, for which the accounting flag in the distribution equals one, proportionally to their weight coefficients, which are obtained as a result of mathematical modelling and industrial experiments, or on the basis of regulatory documentation. In this case, the target gas flow rates for each well are automatically adjusted.EFFECT: increase method efficiency due to provision of stable operating mode of the wells in the conditions of inconstancy of incoming gas.1 dwg

ethod to increase formation hydrocarbon yield and intensify oil-gas-condensate production by means of formation radial penetration with hydraulic monitor at pressure drawdown // 2632836
FIELD: oil and gas industry.SUBSTANCE: presented method includes installing in a well high-strength tubing, a mechanical anchor, a mechanical anchor, rotary and sealing devices, a deflecting tool with an inner channel extending therein, positioning and its possible orientation in space in lower level interval of lateral well bore wiring. A disconnector, a circulation unit, a packer and a funnel are and installed in series below the divider. The wellhead is sealed. The hydraulic monitor nozzle, a wellbore path control unit, a navigation system, working coil (flexible tubing), a flow redistribution device, a non-return valve and a supply coil are installed. Aerated liquid is supplied to inter-string space of the tubing string/coil or simultaneously into inter-string space of tubing string/coil and into inner space of the coil or separate pumping of liquid and gas via two given spaces. The aerated liquid enters the lateral well bore and with the destroyed rock products is returned to the well and pulled to the wellhead through the Inter-string space of the tubing/casing string. On the surface, the washing liquid is degassed, cleaned from hydrocarbons and destroyed rock products. If necessary, it is subjected to additional chemical treatment and returned along annular circulation into the well. The hydraulic monitor nozzle is moved through the sealing device through the deflecting tool to the rock contact. The planned drilling of the radial well bore is carried out at the pressure drawdown, when during formation development the bottom-hole pressure is below the formation pressure or equal to it which is determined by the density of the washing liquid reduced due to aeration and, if necessary, performing foam formation to required values and controlled by calculated ratio of gas and washing liquid supplied from the surface providing changing of such relation in accordance with actual bottomhole pressure measured in the lateral well bore. After formation development, the coil with the nozzle is removed from the formation and the well is flushed down for complete removal of mud at pressure drawdown. By actuation of the mechanical turning device, the divider is moved to another plane. The work cycle is repeated for the next lateral well bore. Milling of ports for all lateral well bores shafts is carried out in advance before performing the main operation for development of lateral well bores by means of string annular milling or hydraulic jet cutting of separate ports. When drilling the lateral well bore, the well bore path is determined and changed by supplying the coil with the well bore path control unit and the navigation equipment.EFFECT: increased efficiency of wells and extraction coefficient of hydrocarbons.5 cl, 2 dwg

ethod for developing well after hydraulic fracturing // 2630930
FIELD: oil and gas industry.SUBSTANCE: method of well development includes lowering a tubing string into the well, binding a nitrogen compressor with an injection line with the upper end of the tubing string at the wellhead, injection of nitrogen through the tubing string into the well, circulation of aerated liquid into a channel-type container. At that, the tubing string is equipped with a packer at the wellhead and lowered into the well. The packer in seated on the well above formation cap. Hydraulic fracturing of the formation is produced to form a fracture crack and its fixation by proppant. Then the lower end of the coiled tubing string (CT) is provided with a flushing nib and check valve at the wellhead. The CT string is lowered into the well by 100 m and the pump set is started at a flow rate of 3.0⋅10-3 m3/c. Circulation of process fluid is induced through annular space between the tubing and CT strings in the channel-type container. Next, the CT string is lowered to the lower end of the tubing string. Compressor is started with nitrogen flow rate of 0.2⋅10-3 m3/s and circulation of aerated liquid is induced along inter-tube space between columns of tubing and CT into channel-type container. The CT string is lowered to the bottomhole. The well bottom is flushed with aerated liquid to clean water for 2 hours, after which the pump unit and compressor are switched off. The CT string is lifted in the tubing string 20 m above the lower end of the tubing. The nitrogen compressor is started. After the release of nitrogen from inter-tube space between the tubing and CT strings into the channel-type container, the well is developed with nitrogen at a flow rate of 16 m3/min for 2 hours. In the course of well development, the CT string is lifted and lowered every 20 minutes at a rate of 5 m/min. In the process of development, sampling fluid is sampled every 30 min on oil-water percentage, average flow, sampled water density. After 2 hours, the compressor is stopped and process settling is carried out for 2 hours, then CT string is introduced into the well to the bottom without circulation at a rate of 2 m/min with unloading of CT string on the bottom with a force of 5000 N.EFFECT: increase of efficiency and quality of well development, simplification of technological process.2 dwg

Formation of cross-linking in the swellable polymer with pei // 2630543
FIELD: chemistry.SUBSTANCE: composition contains polymer particles expand, capable of containing polymers based on acrylamide, cross stitched using unsustainable cross-linking agents and stable cross-linking agents. These polymers have the ability to reamidation reaction. Particles are mixed with liquid and not reacted with a tertiary crosslinking agent that contains the polyethylenimine PEA ("PEI"). Tertiary crosslinker has the ability to continue sew these particles covalently through reamidation reaction at a temperature of 150-190°F after the destruction of the unsteady crosslinking agent with the formation of a stable gel.EFFECT: invention allows to receive stable gels, stable and less susceptible to fluid loss or resistant to leaching of subsequent download liquid.17 cl, 6 dwg, 1 tbl, 8 ex

ethod and for ultrasonic intensification of oil production and device for its implementation // 2630012
FIELD: oil and gas industry.SUBSTANCE: method includes placing a well device in well at working depth and connecting it to ground source, and performing excitation of elastic oscillations of different frequencies. At that, polluting products are destroyed from the bottomhole area of the oil formation, and oil recovery is stimulated by regular impact of elastic oscillations field of ultrasonic range in a continuous mode and pulse acoustic low-frequency action with simultaneous removal of the polluting products from bottomhole area of oil formation by creating rarefied space in the well perforation area and withdrawing said products from well with a jet pump. In the continuous mode, the impact is performed by high-frequency oscillation of 16-25 kHz in ultrasonic range, and the impact is carried out in pulse mode at frequency of 1-50 Hz. At that, the impact on the perforation area is started from the lower section with the subsequent movement above. The oil stimulation devices are three main devices: an ultrasonic generator, a downhole acoustic emitter and the jet pump. The downhole emitter is of magnetostrictive type or has a modular structure consisting of resonators with piezoelectric packs.EFFECT: increase of operation efficiency for intensification of oil production and duration of impact effect of equipment used.12 cl, 5 dwg
Recovery method for oil-source reservoirs by the controlled multi-stage hydraulic fracture // 2627799
FIELD: oil and gas industry.SUBSTANCE: invention can be applied in the development of oil-source reservoirs managed using a controlled multi-stage hydraulic fracturing (MHF). To isolate high permeability zones and fractures, the method comprises applying in the wells of injection of mixture of surfactants, polyacrylamide (PAA), a stapler - chromium acetate, filler and water, well subjecting to process exposure, products selection from wells. According to the invention, a low-permeability reservoir is selected with an average absolute permeability of less than 2 mD, which are used for drilling, or already drilled horizontal sidetrack wells are used. In each of such wells, the first MHF is performed, during which the fracture propagation area is recorded by means of low-frequency seismic survey. Packers separate the horizontal wellbores into sections, then the wells with conducted MHF are injected, through each horizontal wellbore section, with insulating composition with the following component ratio, wt %: SAW - 0.2-5.0, PAA - 0.005-2.5, chromium acetate - 0.01-1.0, filler - 0.5-15.0, water with a salinity of less than 1.5 g/l - the rest. After the soak period during 1-10 days and colmatation of fractures after the first HF, the second HF is conducted in the same wells by the pumped insulation compound, during which fracture propagation is also recorded by means of the low-frequency seismic survey. Upon obtaining data on fractures distribution after the first and the second MHF, a decision is made on performance in these injection wells of subsequent phases of insulating composition injection and MHF conducting. Moreover, the number of subsequent MHF is determined based on the full reservoir coverage with MHF fracture zones both in plan and in profile around each horizontal wellbore. After all MHF, the reservoir is processed by separate injection in each stage of the horizontal wellbores of the insulating composition solvent in a volume of 0.8-2.0 from the total volumes previously pumped insulating compositions to this satge of the horizontal wellbore.EFFECT: increasing of the coverage factor and oil production of the oil-source reservoirs.

Operating method of high-viscosity oil recovery downhole // 2626484
FIELD: oil and gas industry.SUBSTANCE: method includes the downhole assembly, consisting of the bottom upwards from the lower perforated joint, the rod well pump, the tubing string - TS and the rod string. The rod well pump is actuated by the action of the rod string movements, the high-viscosity oil is supplied to the wellhead through the tubing string and the high-viscosity oil is selected through the tubing string with the possibility of direct washing. After actuating the rod well pump and the high-viscosity oil selection start, the initial dynamometer chart is recorded and the initial maximum and minimum loads to the rod string is determined. Continue the high-viscosity oil selection from the downhole through the tubing string by the rod well pump and periodically record the dynamometer charts. If according to the dynamometer chart results the maximum or minimum loads deviation is from 0 to 5% from the initial values, then continue to operate the downhole. If the deviation is from 5 to 30% from the initial values, then stop the rod well pump and perform the downhole backwashing by pumping of hot oil with the special pump unit through the interstring space into the lower perforated joint through the tubing string to the trough until the injection pressure in the interstring space drops in 1.5 times. After that provide the repeated recording of the dynamometer chart. Determine the maximum or minimum loads to the rod string, from the condition of reaching 0 to 5% from the initial values. If the maximum or minimum loads deviation during the dynamometer chart recording is from 30 to 100% from the initial values, then the geophysical tipped logging cable is lowered without interrupting the selection of high-viscosity oil by the rod well pump. Provide the impulse high-frequency thermoacoustic (IHFTA) conditioning of the borehole and bottomhole formation zone. During the IHFTA conditioning process of the borehole and bottomhole formation zone the dynamometer chart is periodically recorded every 4 hours until the maximum and minimum loads on the rod string are restored from 0 to 5% of the initial values. After that without interrupting the high-viscosity oil selection, the downhole treatment is stopped and the tipped logging cable is extracted from the downhole interstring space.EFFECT: increase of the high-viscosity oil recovery downhole efficiency by reducing the intensity of asphaltene deposits on the downhole inner walls, the water-oil emulsion breaking and increasing of the high-viscosity oil amount selection from the downhole.3 dwg

ethod of hydrocarbons deposit develompent in low-permeability sediments // 2625829
FIELD: oil and gas industry.SUBSTANCE: according to the method, in the wells, repeated cycles are implemented of pressure decrease and increase, forming a network of micro and macro fractures. Each cycle consists of the steps of hydrocarbons extraction, well downtime, methane agent injection in the same well, repeated downtime. In each cycle, formation hydrocarbon production from wells is carried out until productivity reduction by 30-50% below the initial value of the current cycle. After shutoff, well downtime is for at least 5-7 days for pressure equalization, relaxation of the rock stress-strain state and stabilization of the fracture system in the area covered by the deformation effects at lower bottomhole and formation pressure. During the downtime, the condensate bank parameters are estimated. In the process of gas injection and subsequent downtime, the effectiveness is estimated of the condensate bank deforming due to the condensate evaporation in the gas phase.EFFECT: increased hydrocarbon extraction rates: gas recovery, condensate recovery, oil recovery, and productivity of production wells.9 cl, 1 dwg

ethod of forming a water-gas mixture for pumping in a performance well and a control system for its implementation // 2622575
FIELD: oil and gas industry.SUBSTANCE: according to the method, a gas-water mixture is formed for pumping into the injection well. This is done by means of a mixer that is connected at the inlet to the water pipeline and the gas pipeline. The mixer is made with the possibility of a controlled reduction of the inlet pressure and enabling the perturbations in the formation system of the water-gas mixture to be extinguished by the gas valve. Measuring the water and gas pressures in the water and gas lines, is made respectively, before and after the control valves and monitor the pressure differences thereon to control the flow of water or gas. Gas consumption is limited within the operating range. To do this, the resulting pressure drops are compared with a given value of the minimum pressure drop. If the actual pressure drop is greater than the preset minimum, the target water and gas flow rates continue to be maintained. If the actual pressure drop becomes equal to or less than the specified minimum differential pressure, then the control signal to the valve via the gas is applied to the valve via the gas to reduce the flow rate of the injected gas. It is supported on the control valve on the water by injecting it into the well, ensuring self-tuning of the operating mode of the well for pumping the water-gas mixture. How to implement a system to manage the process of formation of water-gas compounds for injection into an injection well.EFFECT: achieving stabilization of water-gas injection of the mixture in the injection hole, preventing excessive wellhead pressure due to borehole gas phase.2 cl, 2 dwg

High-viscosity oil well development method // 2620692
FIELD: oil and gas industry.SUBSTANCE: invention is intended to reduce asphaltene, resin and paraffin sediment (ARPS) for downhole equipment and water oil emulsion breaking in the borehole during high-viscosity oil well operation. The high viscosity oil well development method includes the descent into the well of a tubing string - tubing with a pump and a capillary tube fixed to the outer surface of the tubing tring with taps, simultaneous oil withdrawal and chemical reagent supply with a metering pump from the wellhead via a capillary tube. Screw pump with top drive from the rod string is used as the pump. Oil paraffin solvent is used as the chemical reagent dispensed through the capillary tube. 12 hours before start of the screw pump drive, pulsed high frequency thermoacoustic processing of the bottomhole formation zone is carried out. Before starting the screw pump, by supplying solvent, the metering pump fills the capillary tube with a solvent from the screw pump suction interval to the wellhead, solvent supply into the capillary tube is stopped, maximum current load is set to the screw pump drive, depending on the rated current load of the screw pump drive electric motor. The screw pump drive is started with rotor speed 70 rpm, followed by gradual increase up to 110 rpm. After starting the screw pump drive, solvent is supplied through the capillary tube for the screw pump suction at a rate of 10% of the well flow rate. When the load current rises to 15% of the rated load, rotor speed is reduced to 60 rpm, solvent supply to the capillary tube is stepwisely increased to 20% of the well flow rate. If the load rises above the maximum value, and the pump is disconnected, backwash with hot oil is performed and well development continues with high viscosity oil.EFFECT: improved reliability of method implementation by ARPS elimination on the downhole equipment, with the pump putting into operation with increased efficiency of the downhole pump.2 dwg
Oil deposit development method // 2618246
FIELD: oil and gas industry.SUBSTANCE: method is carried out by selection of objects for formation stimulation and increase of oil recovery coefficient. Laboratory studies of oil and gas of selected objects are conducted to define conditions to ensure effective displacement of oil from reservoir formation by gas. Maximum allowable formation pressure values in gas bypass into oil deposit at the oil-water contact and the size of gas factor of oil taken from oil deposit in the area of gas bypass formation stimulation are determined. Gas bypass from gas-saturated formation or gas cap is carried out in a cyclic mode. Time of gas bypass cycle to oil-saturated deposit is set on the basis of regularly measured values of current formation pressure values at the oil-water contact interface, which should be no higher than pressure value of water contacting to oil deposit, and the value of the GOR should be appropriate to working conditions of oil production wells without breakthrough of gas bypassed to oil deposit. Changes in GOR for all producing wells are monitored, and in case of breakthrough of gas bypassed into oil deposit, producing wells flow rate is regulated or these wells are temporarily stopped. Changes in formation pressure or liquid levels in a zone close to the current oil-water contact are monitored, and when they reach values close to pressure in aquifer zone, gas bypass mode is changed or bypass is temporarily stopped.EFFECT: increased of oil withdrawal from oil deposit.1 ex, 2 dwg

ethod for determining horizontal shaft maximum length in conditions of cavern-fractured carbonate oil and gas-saturated formation with abnormally low formation pressure // 2617820
FIELD: oil and gas industry.SUBSTANCE: method comprises determining abnormality coefficients, fracturing, absorption, measured depth, vertical depth, mud density equivalent to circulating density considering distribution on the shaft. Wherein identification and analysis of cavern-fractured formation permeability gradations is carried based on previously drilled wells, then the chart of allowable depression/repression range is plotted; the range of fluctuation in equivalent circulating density of particular horizontal shaft point is additionally evaluated based on actual measurements of downhole pressure fluctuations in the well, equivalent circulating density is calculated based on bottomhole pressure fluctuations characterized by chart line thickness; then the chart of combined pressures of horizontal shaft interval is plotted and, based on the chart, horizontal shaft maximum possible length is determined at intersection of allowable repression/depression ranges and equivalent circulating density range.EFFECT: improved accuracy of calculation of maximum horizontal barrel length for a particular type of fractured reservoir and hydrocarbon system.4 dwg

ethod and device with solid bottom to generate pressure waves in the injection well bore // 2616024
FIELD: oil and gas industry.SUBSTANCE: device for generating pressure waves in the injector bore is designed as the Helmholtz jet generator (HJG), containing: a cylindrical chamber of the cavity resonator with two parallel lids - front and rear; the inlet nozzle, disposed in the front lid; the ring, mounted on the radial pillars on the cylindrical chamber axis of the cavity resonator in the interval between the lids; and the outlet hole. Wherein the inlet nozzle is connected with FC and the outlet is directed downward along the borehole. Wherein the outlet is made on the side from the inlet nozzle, in the front lid or housing of the cavity resonator cylindrical chamber.EFFECT: increasing the efficiency of low-frequency vibrations generating without increasing volume of the cavity resonator chamber or holes length.2 cl, 5 dwg

Elements of wiping cementing plug and methods of treatment of medium surrounding well for the ihflow stimulation // 2615196
FIELD: mining.SUBSTANCE: group of inventions relates to treating the medium surrounding the well for the inflow stimulation. According to the method, the casing string cementation in the wellbore is carried out. The wellbore casing comprises a valve disposed below the fluid medium throttling device. The fluid medium throttling device comprises the tubular element with the saddle disposed in the tubular element channel, and the plug to be mounted on the saddle. The valve opening is carried out to establish fluid communication between the wellbore casing and the medium surrounding the well. The plug is mounted on the saddle for throttling fluid communication between the wellbore casing and the medium surrounding the well. Pressure testing of the wellbore casing is performed. Without additional geotechnical measures, part of the plug in the wellbore is removed, what provides increased fluid communication between the wellbore casing and the medium surrounding the well. Treatment for the inflow stimulation in the medium surrounding the well is performed.EFFECT: invention provides increased efficiency in the treatment of the medium surrounding the well.15 cl, 6 dwg

ethod of extraction of oil, condensate and high-molecular compounds // 2613644
FIELD: oil and gas industry.SUBSTANCE: industry of a single technical-and-economic regional cluster. A method of extraction of oil, condensates and high molecular compounds is implemented in the complex comprising at least two gas-condensate fields with oil banks. The first field is close to be depleted, and the second one is high-yielding. The fields differ by content of hydrogen sulphide and carbon dioxide impurities in the produced hydrocarbon gas. The process is performed by injection into the reservoir of gas condensate fields with oil rims of carbon dioxide and extraction of gas-liquid mixture. The carbon dioxide for injection into the reservoir of the first field iatn the initial stage is produced from extracted second hydrocarbon gas with a larger amount of carbon dioxide. The ratio of hydrogen sulfide and carbon dioxide impurities in the recovered hydrocarbon gas for the first and the second fields are (2.4): 1 and 1: 1 respectively. At the initial stage the gas treatment is performed at the first field with one stage with simultaneous deep extraction of hydrogen sulfide and carbon dioxide. As the impurities ratio gets closer to 1: 1 two treatment stages - selective and deep - are performed. Purification of the produced gas of the second field is continuously performed in two stages. The recovered carbon dioxide is pumped to the compression down to the pressure 7.0-8.0 MPa for further transportation in liquid form to the first field. Injection is performed into injection wells located on hydrocarbon production sites. The recovered gas, condensate from production wells, including retrograde one, and high molecular compounds are separated into gas and liquid phases. The gas phase is transported to gas processing plants, and liquid phase - to refineries of the single cluster.EFFECT: invention improves the efficiency of extraction of hydrocarbon from the fields depleted by forming links between production and processing elements of the cluster to ensure its functioning in conditions of dynamic changes in composition of produced hydrocarbon gas and productivity of fields.6 cl, 1 dwg
ethod for formation water-gas simulation during oil deposits development // 2613404
FIELD: oil and gas industry.SUBSTANCE: according to the method, preliminary, on a hydrodynamic formation model target volumes are determined of alternating water and gas slugs for injection into the formation corresponding to the maximum value of the oil recovery factor. Then, a target gas slug volume is injected into the injection well. Then, the injection well is stopped before the pressure reduction in the well bore zone to the value of the average formation pressure at the time of termination of the gas injection into the formation, covered by the injection well influence. Further, the injection well is pumped the first part of the target water slug with a minimum technologically possible injectability to reduce gas saturation of the well bore zone to the value of residual gas saturation. This value is achieved upon stabilizing the injectability dynamics of on the formation. After that, the injection well is further pumped with the rest of the target water slug volume with maximum technologically possible injectability until recover of the formation pressure at the level of the initial value or above. The above pumping cycle is repeated in the oil deposit development.EFFECT: enhanced oil production.3 dwg, 3 tbl, 1 ex
Recovery method of oil-source fields // 2612063
FIELD: petroleum industry.SUBSTANCE: invention refers to the petroleum industry. The recovery method of oil-source fields includes selection of oil field, oil-source deposits of which has average absolute permeability of 2 mD. Either already drilled wells or the new wells to drill may be used. All wells should be production wells. A well is switched to pumping of operation agent after completion of a condition in one of the wells ql < 0.3·ql0 where Pb < 0.3·Pfor0, where ql is the current liquid rate of a well, ql0 is the initial liquid rate after commissioning of a well before corresponding withdrawal cycle, Pb is the current bottom hole pressure, Pfor0 is the initial formation pressure. Carbon dioxide (CO2) is used as the operation agent, pumping of which is performed with gradual increasing of consumption from 0 to qpumpmax, where qpumpmax is the maximum consumption of CO2 at the pumping pressure of Ppump = (0.8-1.0)·Prock, where Prock is the vertical rock pressure. After achieving qpumpmax, the pumping stops, and the well stop either for redistribution of pressure in the reservoir for 10-100 days long, after that, the well may be commissioned into production, the cycles of the pumping and withdrawal are repeated. The same operations should be performed in all wells of the oil field.EFFECT: technical result lies in the increasing of oil production from oil-source fields.6 ex
Recovery method for oil-source carbonate reservoirs // 2612062
FIELD: petroleum industry.SUBSTANCE: invention refers to the petroleum industry. The method of recovery of oil-source carbonate reservoirs includes drilling, recovery, and extraction of product from wells, and definition of the injection capacity of wells. An oil-source carbonate collector is selected with the average absolute permeability of at least 2 mD. All wells should be production wells with horizontal ends. In the horizontal shafts, the multistage hydraulic fracturing is performed, after completion of a condition in one of the wells ql < 0.3·ql0 where Pb < 0.3·Pfor0, where ql is the current liquid rate of a well, ql0 - is the initial liquid rate after commissioning of a well before corresponding withdrawal/pumping cycle, Pb s the current bottom hole pressure, Pfor0 is the initial formation pressure, this such well is switched to the pumping of the operation agent with gradual increasing of consumption from 0 to qpumpmax, where qpumpmax is the maximum consumption of a mixture at the pumping pressure of Ppump = (0.5-1.0)·Prock, where Prock is the vertical rock pressure. The mixture of acid with the initial concentration of 15-24%, surface-active agents (SAA) with the concentration of 0.2-1.0%, and water with the total mineralization of no more than 1.5 g/l - the rest is used as the operation agent. During the pumping, the acid concentration is gradually reducing to the null. The ratio of these components, such as SAA, acid, and concentration reduction rate, is defined according to laboratory testing for determination of a compound showed the best core oil recovery factor. After achieving qpumpmax the pumping stops, and the well stop either for redistribution of pressure in the reservoir for 10-100 days long, after that, the well may be commissioned into production, the cycles of the pumping and withdrawal are repeated. The same operations should be performed in all wells of the oil-source carbonate reservoir.EFFECT: technical result lies in the increasing of oil production from oil-source carbonate reservoirs.3 ex

ethod of developing oil deposits at late stage of operation // 2611097
FIELD: oil and gas industry.SUBSTANCE: invention relates to the extraction of hydrocarbons, namely to the development of oil deposits at the late stage of operation. The method includes the initial period of operation and the final period of operation, at which the methods of enhancing oil recovery - EOR - are applied. According to the method, determining the criterion of the EOR implementing start is envisaged. To do this, the graphical dependence of the relationship of the volume of initial extracted oil reserves located within the feeding radius of a specific production well to the estimated value of cumulative oil extraction of this well depending on the time of operation (the reference chart) is drawn, then - to the forecast value of cumulative oil production, then - to the value of the actual cumulative production of this well. After that, the resulting graphs are combined. During the well operation, the time point of the beginning of divergence in the graphs of the reference and actual changes in the volume relationships of the initial extracting reserves is established. The graphs divergence point is defined as the time point for introducing an appropriate EOR for the impact on the pitface formation zone to restore the productivity of the selected well. Wherein the following graphs discrepancies of the reference and actual changes of said relationships over time are selected as the basis for the next EOR introduction.EFFECT: invention provides improving the efficiency of the operation method due to the timeliness of introducing the necessary methods for enhanced oil recovery.1 dwg

ethod and device for two-chamber helmholz spray oscillator for generating pressure waves at the bottom hole // 2610598
FIELD: oil industry.SUBSTANCE: group of inventions refers to oil industry and is intended for removing solid deposits from walls of casing pipes and perforation apertures, decolmatation of the formation bottomhole zone and increasing mobility of the formation fluids. In the method of pressure waves generation at the bottom of the well a Helmholz spray oscillator (HSO) is installed on the lower end of a tubing string (TS), representing an oscillating system excited with a spray of fluid flowing through it and consisting of a spray generator positioned inside the chamber of the volume resonator. Herewith primary pressure oscillations of certain frequency in a spray of liquid are generated with the spray generator and the oscillating system is excited with them. Primary pressure oscillations are amplified in the chamber of the volume resonator, natural frequency of which is tuned with resonance to generation frequency of primary pressure oscillations. Pressure waves at the bottom hole are created. Herewith another chamber with an opening is installed behind the chamber of the volume resonator, thus forming the oscillating system having three natural frequencies not corresponding to natural frequencies of its separate elements. Primary pressure oscillations generation frequency is adjusted at the highest natural frequency of the oscillation system. Herewith the oscillating system on all the other natural frequencies is excited and pressure oscillations are generated on the lowest natural frequency.EFFECT: technical result is higher efficiency of generation of low-frequency oscillations at the bottom hole with a high-speed spray.2 cl, 2 dwg

ethod of developing oil and gas deposits // 2610485
FIELD: oil industry.SUBSTANCE: invention relates to the oil and gas industry and may find application in the development of oil and gas deposits where oil production is associated with a high risk of a breakthrough of gas from the gas cap. Method involves drilling of horizontal wells. In a horizontal section of oil wells set casing packers and autonomous or adjustable inflow control devices with the creation in the oil-saturated range of not less than 3 sections isolated from each other. Additionally, in the oil rim drill horizontal injection wells. Through them prior to the beginning of operation of oil wells perform pumping of pressure agent to create in the field of oil production of pressure above the initial reservoir one. Through this form the main fluid flow in oil wells in the lateral direction. Gas is produced through one or more horizontal wells in the gas cap angled or perpendicularly to oil producing wells. Extraction is carried out in volumes that allow to create in the gas cap of funnel of depression over the area of extraction of liquid fluids in the oil portion in the area of oil wells. This helps to maintain the stability of the gas-oil contact with a delay of time of formation of the gas cone. Design of the gas wells provides blind inserts located above the injection wells, with a length of at least one of the distance between oil-producing and injection wells preventing production of fluids in those intervals.EFFECT: technical result is the intensification of oil production and possibility of control over the movement of gas-oil contact to reduce the intensity of gas coning out of the gas cap in the development of oil rims below the gas cap.3 cl, 4 dwg, 2 tbl
Recovery method for oil-source reservoirs by controlled hydraulic fracture // 2610473
FIELD: petroleum industry.SUBSTANCE: invention refers to the petroleum industry. The method of recovery of oil-source reservoirs by the controlled hydraulic fracturing includes selection of tight reservoir with the average absolute permeability of lea than 2 mD, where drilled wells are used or the new wells are drilled, either vertical or obliquely-directed. In each of such wells, the first hydraulic fracturing is performed (HF), during which the area of fracture propagation are recorded by means of low-frequency seismic survey. To the wells with the HF conducted, the insulation compound is pumped with the following ratio of components, mass.%: SAS - 0.2-5.0; SAA - 0.005-2.5; chromium acetate - 0.01-1.0; filler - 0.5-15.0; water with mineralization of no more 1.5 g/l - the rest. After the soak period during 1-10 days and colmatation of fractures after the first HF, the second HF is conducted in the same well by the pumped insulation compound, during which fracture propagation is also recorded by means of the low-frequency seismic survey. According to the received data on fracture propagation after the first and the second HF, a decision on conduction in these wells of the following stages of the pumping of the insulation compound and conduction of the following HF is made, moreover, the number of the following HF is determined according to the coverage of a reservoir by fractures areas in 360° in the plan in the area of each well. After all HF, the processing of the reservoir is held by the pumping of the insulation compound solvent in the volume of 0.8-2.0 from the sum of volumes of insulation compounds pumped earlier in the same well.EFFECT: technical result lies in the increasing of the coverage factor and oil production of the oil-source reservoirs.2 ex

One-piece joint for insulated conductors // 2610459
FIELD: mining.SUBSTANCE: invention relates to production of hydrocarbons, more specifically, to connecting elements, intended for insulated cables and/or input cables connection, used for formations heating. Method includes connection of heating section core with insulated conductor core in covering rock. Diameter of heating section core is less, than diameter of section core in covering rock. First insulating layer is placed on heating section core so, that at least part of heating section core end section remains open. Second insulation layer is placed on section core in covering rock so, that second insulation layer passes along heating section core open section. Second insulating layer thickness is less than thickness of first insulating layer, and section in covering rock outer diameter is substantially equal to heating section outer diameter.EFFECT: technical result consists in improvement in insulated conductors joints reliability during manufacturing, assembling and/or their installation.30 cl, 7 dwg

ethod of intensification of hydrocarbons production using horizontal wells // 2607563
FIELD: oil and gas industry.SUBSTANCE: invention relates to oil and gas industry, namely, to wave technology of combined action on productive formations using horizontal wells. Method means placing hydraulically connected to the well head through the upper obstacle-reflector column two tubing - TS string of different length in the casing string. One column of TS ends at the inlet to the horizontal section of the well. Other TS ended near the bottom of the casing string. This bottom is outlet obstacle-reflector, forming together with upper obstacle volume, inside of which is the liquid column working agent. Creating homogeneous wave field on the horizontal section of casing string in the liquid by installing vibration generators on the ends of the TS in the casing string. Vibration amplitude is increased. Vibration is controlled with recording of vibrations supplied via the cable from the downhole level meter to ground recording unit. Matching of oscillation phase on horizontal section of the well casing string is provided after well start-up in operating conditions of hydrocarbons production by change of the initially selected oscillation frequency output pressure generators by automatic or manual variation of flow rates of working agent through generators provided that flow rate in steady-state conditions. Initial length of TS, prior to lowering into well is selected through calculation using the analytic expressions in case phases of oscillations match and amplitudes of oscillations equality on horizontal section of casing string for a selected frequency action on formation.EFFECT: technical result - increased output of productive formation as a whole and on horizontal sections of the well due to wave action optimization.1 cl, 2 dwg
ethod of development of oil fringe and under-gaz zone of complex deposits // 2606740
FIELD: oil industry.SUBSTANCE: invention relates to oil and gas industry, namely to problem of increasing efficiency of development of oil fringes and under-gaz zones of oil, oil and gas and oil and gas condensate deposits with previous period of gas production from gas or gas condensate cap or without it. According to method samples of oil and/or gas are obtained. Component composition of samples and value of critical pressure are determined, at which oil evaporates in gas. Then for deposit three-dimensional geological and multicomponent filtration model of productive formation are created. On basis of it production and gas-injection wells are placed. Their drilling is performed depending on oil-water contact and gas-oil contact. Wherein oil fringe between levels of oil-water and oil-gas formations is drilled with injection wells. Dry gas is pumped into them. Dry gas injection is carried out with bottom-hole pressure, exceeding critical pressure of oil evaporation, defined by experimental results. Gas-saturated zone above level of oil-gas contact is drilled with production wells. Evaporated oil is extracted through them together with gas and condensate.EFFECT: technical result is increase of well product extraction efficiency.1 cl, 4 ex, 2 tbl, 2 dwg

ethod of developing oil deposit by horizontal wells // 2605860
FIELD: oil and gas industry.SUBSTANCE: invention relates to oil industry and can be used in development, using horizontal wells, heterogenous terrigenous or carbonate oil deposits. Method involves drilling horizontal wells. Horizontal boreholes are arranged at an angle of 0-30° to each other in horizontal plane at a distance of 50-500 m. Production and injection wells are alternated. According to drilling a map of distribution of permeability of reservoir in area of drainage of horizontal wells is constructed. Zones differing from each other by more than 1.5 times on permeability are selected on maps. At points of intersection of horizontal bores of transition from one zone to another packers are installed. This divides horizontal boreholes into sections. Length of each section is selected not less than 10 m. Development is started by lowering pumps in horizontal boreholes of producing and injection wells in most permeable sections. After development of reservoir opposite one of sections in one of producing wells a pump of said well is moved and installed in horizontal borehole in a section next on decrease of permeability. When moving all pumps of production wells at next section on permeability pump is also moved in injection wells at following sections on reduction of permeability. In each well in operation of one of sections in horizontal shaft, other sections of same horizontal shaft is switched off by said packers. Procedure of moving pumps into less permeable sections is repeated, by successive development of entire deposit from higher permeability to lower permeability.EFFECT: increasing oil recovery of inhomogeneous oil deposits.1 cl, 1 ex, 1 tbl, 1 dwg

Garipov method for intensification of oil extraction and apparatus therefor // 2605571
FIELD: oil industry.SUBSTANCE: group of inventions relates to oil industry and can be used for simultaneous separate development of multiple production facilities with electric submersible pump using acoustic effect on formation fluid in oil well. Method involves lowering in a given well interval tubing string, submersible pump and a source of acoustic vibrations, connected to generator of acoustic vibrations. Method includes degassing of reservoir fluid by exposing reservoir fluid to acoustic vibrations, generated by a source of acoustic vibrations. Degassed fluid is extracted from well. Source of acoustic vibrations is a high-frequency acoustic radiator, one or more. Said source of acoustic vibrations is installed above submersible pump. Degassing of reservoir fluid, coming out output of submersible pump, is performed.EFFECT: technical result is higher efficiency of oil production, increase oil inflow and continuous process of extracting degassed oil due to acoustic degassing of fluid in well above submersible pump.18 cl, 5 dwg

Well bottomhole zone treatment method // 2601960
FIELD: oil and gas industry.SUBSTANCE: invention relates to oil production and, in particular, to methods of acid treatment of a bottomhole formation zone with subsequent well introduction into service. Method can also be used at wells workover and, in particular, when cleaning channels of the productive formation. Method involves the treated formation separation from the annular space of the well. Injection of an oxygen composition into the treated formation interval is performed. Process exposure is performed. Reaction products are swabbed and extracted from the formation. Well killing is carried out. Pump unit is lowered and the well operation is started. Herewith, before separation of the treated formation from the annular space a tubing string is lowered into the well with an open end provided with a check valve and with two packers for separation of the treated formation interval from the annular space and from the bottom or from another formation in the well. Tubing string above the lower packer is equipped with a setting tool - ST. Well circulating valve is set above the upper packer. After the process holding both packers are reset above the interval of the treated formation. Well killing is carried out through the borehole circulation valve by replacement of fluid in the annular space of the well and in the tubing string with a killing fluid. Then the upper packer is removed. Prior to lowering into the well the pump unit by means of the ST the tubing string is disconnected from the lower packer and the above said tubing string is removed from the well.EFFECT: provided is maintaining of collection properties of the bottomhole zone of a productive formation at the use at the killing stage of any types of killing fluids.8 cl, 2 dwg

ethod of development of oil and gas condensate deposit // 2601707
FIELD: oil and gas industry.SUBSTANCE: invention relates to oil and gas industry and can be used in development of oil and gas condensate deposits. Method involves drilling the oil part in the under-gas-cap zone using horizontal wells. First, the first open borehole is drilled at the boundary of the gas-oil contact in location and length corresponding to the main production barrel. Water is pumped in to form a water screen able to interact with the gas cap to form methane hydrates. First borehole is eliminated after the water injection is over by placing a cement plug. Further drilling of the main borehole of the production well is performed under the first borehole closer to the bottom of the deposit or to the oil-water contact. Well is operated with a downhole pressure corresponding to the minimum pressure of the hydrate formation area at a specified formation temperature until the necessity of pressure reduction below the pressure of dehydration occurs.EFFECT: increasing oil recovery of deposits due to prolongation of service life of oil wells in under-gas-cap zones.1 cl, 2 dwg

ulti-zone completion with formation hydraulic fracturing // 2601641
FIELD: mining.SUBSTANCE: group of inventions relates to downhole tool for use in oil and gas wells and, particularly, to completion with openings equipment, which can be used for formation hydraulic fracturing in multi-zone wells. Well shaft completion equipment includes casing string assembly with plurality of casing string links and at least one adapter coupling for connection of casing string links. At least one adapter coupling comprises tubular housing having internal flow path and at least one hydraulic fracturing opening made with possibility to create hydraulic connection between adapter coupling outer surface and inner flow path. Equipment includes piece of flexible tubing string. It is installed in casing string assembly. Flexible tubing string includes internal flow path. Between flexible tubing string and casing string assembly annular space is formed. Drill string bottom assembly is connected to flexible tubing string. Drill string bottom assembly comprises formation hydraulic fracturing opening. It is made with possibility of hydraulic connection creation between flexible tubing string internal flow path and annular space. Equipment includes packer. It is installed in specified place to enable contact with at least one adapter coupling during packer operation. At that, packer is made with possibility of annular space above packer isolation from annular space under packer, so that fluid medium passing downwards along flexible tubing string, can flow out of formation hydraulic fracturing opening, thus creating pressure drop at packer to open hydraulic fracturing opening.EFFECT: higher reliability of formation hydraulic fracturing in multi-zone wells.21 cl, 21 dwg

ethod and device of impact on oil-saturated formations and bottomhole zone of horizontal well // 2600249
FIELD: oil industry.SUBSTANCE: group of inventions relates to oil and gas industry for intensification of oil inflow. Method includes delivery and placement in a horizontal well completion a device, equipped with a storage unit of electric energy, a radiator with two electrodes, which are closed by operator command using a calibrated metal wire, that leads to its explosion and formation of directed, point shock wave of high pressure, spreading radially from preset points of horizontal borehole in order to increase permeability of bottomhole zone of working sections of horizontal shaft.EFFECT: technical result is improvement of efficiency of operation of deviating well with horizontal shaft.2 cl, 3 dwg

ethod of high-viscosity oil pool development by a system of wells with side horizontal shafts (shs) // 2599995
FIELD: oil industry.SUBSTANCE: invention relates to oil industry and can be used in development of deposits of high-viscosity oil with water-oil zones of small thickness. In according with method chose oil-saturated section of the deposit, with dynamic viscosity more than 400 mPa·s and with water-oil zone, where the thickness of the oil part formation exceeds 10 m, a water-bearing - is not more than 5 m. Section is drilled with fill-spot elements of vertical wells. From vertical shafts of each well carry out drill in productive layer from one to four BGS with controlled filters. Each BGS is placed towards the neighbor well, receiving so system of opposite BGS. Length of each BGS is carried out 0.4-0.5 from the distance between neighbor vertical wells. Vertical distance between opposite BGS in the productive layer is provided by no more than 2 m. In vertical bores of wells is perforated water bearing part of the layer. In each well is lowered two columns of pipes. One of these pipes packed at oil-water contact. In each element central well is used for plumbing working substance in circulation mode through this columns of pipes. Extraction of the plumped mixture is carried out through the neighbor wells on the specified columns of pipes. Second columns of pipes packed above the roof of productive layer and through them carry out selection of production of layer through BGS. As working substance apply mixture of water with temperature of more than 50 °C, nitrogen and solvent. Optimal ratio of components of mixture is determined by laboratory investigations of oil displacement on cores.EFFECT: technical result - increase of coefficients of coverage and oil recovery of deposits of high viscous oil.1 cl, 1 ex, 2 dwg

ethod for development of high-viscosity oil deposit // 2599676
FIELD: oil and gas industry.SUBSTANCE: invention can be used in development of deposits of high-viscosity oil with water-oil zones of small thickness. Method comprises selecting a section of a deposit, oil-saturated with dynamic viscosity more than 400 mPa·s, with water-oil zone, where thickness of oil part of formation is greater than 10 m, and water-bearing part is not greater than 5 m. Main vertical boreholes are drilled on deposit. Lateral horizontal boreholes - BGS are cut from one of said boreholes with controlled filters towards closest neighbouring vertical well. Length of BGS is 0.5-0.9 of distance between said vertical wells. Distance between horizontal boreholes in productive formation is set not less than 4 m vertically. Water-bearing part of formation is perforated in vertical borehole. Two pipe strings are lowered into well, one of which is packed below sidetracking of lower BGS. Mixture of water at temperature higher than 50 °C, nitrogen and solvent is pumped through said string. Extraction of pumped mixture is carried out in circulation mode through adjacent vertical well, in side of which are drilled BGS. Optimal ratio of components of mixture is determined by laboratory investigations of oil displacement on cores. Oil is recovered through BGS through a second string. Oil extraction is carried out by means of equipment for dual production.EFFECT: increasing sweep efficiency and oil recovery of deposits of highly viscous oil.1 cl, 1 ex, 1 dwg

Well operation method // 2599653
FIELD: oil and gas industry.SUBSTANCE: invention relates to oil industry and can be used in operation of well for extraction of viscous oil emulsion. Method of well operation includes equipment of well tubing string (TS) with bottom-hole pump, filter, cable and capillary pipeline. Electric current is supplied via cable and a solvent and asphaltene-resin-paraffin deposits - ARPD, via capillary pipeline. Method comprises simultaneous recovery of products via tubing string by sucker rod pump. At wellhead in tubing string from below upwards is arranged: plug, heater, filter, bottom-hole pump. Cable is connected with heater, and on external surface of tubing string is secured by clamps cable to heater and capillary pipeline from wellhead to depth of above sucker rod pump with input into inner cavity of tubing string. Tubing string is placed in well so that heater is located from middle of formation to its bottom. For 24 hours before starting drive of sucker rod pump, heater is put into operation. Operating temperature of heater is not higher than 40 °C. After 24 hours is performed step-by-step operation of well bottom-hole pump drive starting with minimum number of swings and maximum stroke and with periodical stepped increase of temperature of heater at 20 °C, starting with temperature of 50 to 90 °C, and solvent supply with pump dosaging device via capillary pipeline with stepped reduction of solvent feeding at 5 l/h, starting from supply of 15-5 l/h, at each stage of operation under condition of achieving maximum volume of product.EFFECT: higher efficiency of heating bottom-hole zone.1 cl, 1 dwg, 1 tbl

ethod of interval treatment of bottom hole zone of horizontal well shaft // 2599156
FIELD: oil and gas industry.SUBSTANCE: invention relates to oil industry and can be used in treatment of bottom-hole zone of horizontal boreholes opening carbonate collector. According to the method is determined a pressure of fluid absorption in open horizontal borehole. Performs processing of open horizontal borehole for liquidation of absorption. After treatment at the wellhead collected from bottom to top and is lowered into open horizontal shaft, which consists of a perforated liner with centralizers, the packer, disconnector, the process pipes string. Performs lowering of the packaging arrangement into an open horizontal borehole. Descent of it is lowering up to the lower end of a perforated liner of bottom horizontal borehole. Then inside a perforated liner is lowered a string pump-compressor tubes - PCT and up to 5 m till the lower end of the tubing string PCT of he lower end of a perforated liner lowering of tubing string PCT is stopped. At the wellhead top end of the production string is equipped with casing valve with casing-head stuffing box. Upper end of the process pipe string is equipped with shell valve with stuffing box. On upper end of the tubing pipe PCT tube valve is mounted. Pumped into the casing space invert emulsion until it appears at the wellhead. Casing valve is closed and opened shell and tube valves. Invert emulsion is pumped via the tubing string PCT to shell space until the appearing of inverted emulsion at the wellhead from shell space. Pumping is stopped and closed shell valve. Casing valve is opened. Performs interval treatment of horizontal shaft, which is divided into sections with length at 50 m, starting from the section from bottom hole. For this purpose, at closed casing valve and opened tube and shell valves in tubing string PCT is injected acid composition and flushed it in casing space in a value equal to the volume of the casing space between tubing string PCT and a perforated liner at the length of processed section. Shell valve is closed. Casing valve is opened and with a reverse emulsion launched on the surface, acid composition is forced via the tubing string PCT from casing space between tubing string PCT and perforated liner at the length of processed section to the bottom hole zone of bench along the whole length of processed section. Waiting for response within 12 hours. Invert emulsion is pumped to the tubing string PCT and displaced the reaction products from horizontal shaft in vertical part. Tubing string PCT is moved to the next interval. After processing of all sections of horizontal shaft the tubing string PCT is lowered to bottom. Casing valve is closed and opened shell valve. In the tubing string PCT marketable oil is pumped until it appears at the mouth of the shell space. Then the packer is installed. Disconnector is disconnected and process pipe string removed from the well. Perforated liner is left in the horizontal well bore. Borehole is equipped with well operating equipment and put into operation.EFFECT: high efficiency of processing.1 cl, 2 dwg

ethod of treatment of bottom-hole zone of the horizontal shafts of boreholes, opening carbonate collector // 2599155
FIELD: oil and gas industry.SUBSTANCE: invention relates to oil industry and can be used in treatment of bottom-hole zone of horizontal shafts of boreholes, penetrated carbonate collector. According to the method is determined pressure of fluid absorption in open horizontal borehole with cased production string in vertical part. There is performed processing of open horizontal borehole by fluid, providing the absence of absorption. After that, at the wellhead collected from bottom to top and is lowered into open horizontal hole, which consists of a perforated liner with centralizers, the packer, disconnector, the process pipes string. Descent of build is lowered to reach with the lower end of a perforated liner bottom horizontal borehole. Then inside a perforated liner is lowered a string pump-compressor tubes - PCT and up to 5 m till the lower end of the tubing string PCT of he lower end of a perforated liner lowering of tubing string PCT is stopped. Upper end of the production string is equipped with casing valve with casing-head stuffing box. Upper end of the process pipe string is equipped with shell valve with stuffing box. On upper end of the tubing pipe PCT tube valve is mounted. At open pipe and shell valves and closed casing valve is pumped into the tubing PCT invert emulsion. It is injected by acid composition to filling tube space of the well by reverse emulsion. Casing valve is closed and opened shell valve and continued pumping of acid composition through casing space of well in tank. Produce circulation of the acid composition to the loss of activity of acid composition. After that, circulation of the acid composition is stopped. Casing valve is closed and open shell valve. By pumping of fluid in shell space of the well is displaced the invert emulsion from shell valve to the casing space of well. By reverse emulsion is displaced the products of reaction of acid composition with carbonate reservoir through the casing valve in tank. Packer seating is performed. Disconnector is disconnected and process pipe string removed from the well. Perforated liner is left in the horizontal well bore. Well is equipped with production equipment and put it into operation.EFFECT: high efficiency of processing.1 cl, 2 dwg

ethod for oil production from underground oil deposits // 2598672
FIELD: oil industry.SUBSTANCE: invention relates to oil production, particularly to a method of oil extraction from underground oil deposits. Method assumes penetration of at least one injection well and at least one production well. One or more displacement media are forced in at least one injection well, and oil is extracted through at least one production well. Zones of oil deposit with high permeability in the area between at least one injection well and at least one production well are locked out, for this purpose at least one F1 aqueous composition of and at least one F2 aqueous composition is forced through at least one injection well in deposit in each case individually and in series. Compositions after pumping get mixed with each other in the formation in the zone of mixing and form viscous gels. Continued injection of one or several displacement in injection well. Composition F1 includes water and urotropine. Composition F2 includes water and urea. F1 and/or F2 contain at least one compound M selected from compounds of metals and compounds of semimetals, compound M is gel-forming on addition of alkali. Compounds of metals and compounds of semimetals are selected from the group of salts Fe (II) and Fe (III), vanadium salts, zirconium salts, aluminium salts (III), and silicon colloidal compounds. In zone of mixing, urotropine concentration is at least 1 wt%, urea concentration is at least 5.75 wt%, and concentration of at least one compound M is at least 5 wt% relative to the sum of water, urotropine, urea and at least one compound M located in the zone of mixing.EFFECT: technical result is higher oil yield.13 cl, 2 tbl, 3 dwg
ethod for water influx isolation of oil well // 2593279
FIELD: oil and gas industry. SUBSTANCE: invention can be used during development of oil deposits with bottom water. Method involves pumping water-insulating material into borehole environment and oil extraction. Method comprises perforation in production well of interval of oil-water contact, interval above and below oil-water contact. Pumping into interval of oil-water contact a first fringe of water-insulating material with density greater than density of oil and less than density of formation water and creating a barrier for formation water flow during contact with formation water. Pumping is stopped. Simultaneous pumping is performed in interval above water-oil contact of first fringe of oil and in interval below oil-water contact of first fringe of formation water with same pressure and with same flow rate. Pumping is stopped. Method includes injecting into interval of oil-water contact of a second fringe of water-insulating material. Pumping is stopped. Simultaneous pumping is performed in interval above water-oil contact of a second fringe of oil and in interval below oil-water contact of a second fringe of formation water with same pressure and with same flow rate. Pumping is stopped. Method includes repeating operations of pumping fringes of water-insulating material, oil and formation water before setting of water-insulating material. Method includes process holding for setting and hardening of water-insulating material. Method includes isolation in well of interval of oil-water contact and interval below oil-water contact from top of well volume and oil is extracted through interval above oil-water contact. Volumes of all first fringes are maintained equal and volumes of all second fringes are kept equal. EFFECT: high efficiency of water influx isolation. 1 cl, 3 ex

ethod of developing well oil reservoir with horizontal termination // 2590918
FIELD: oil and gas industry.SUBSTANCE: invention can be used in developing heterogenous terrigene or carbonate producing beds with horizontal wells. In method of oil formation development with horizontal wells drilling or selection of already drilled horizontal well are carried out. Extracted at horizontal shaft intervals of productive formation, differing in properties. Tubing string is run in well with packer. Separated intervals of productive formation with packer. Pump, control devices in form of electric valves and pressure gauges-thermometers are lowered into well. Product is lifted to surface using pump via inter-tube space. Preliminary between intervals of productive formation there equipment for well local reinforcement is installed. Layout is lowered into well, consisting of packer, tubing string, casing valve equipment with lower electric valve for regulation of inflow via tubing string, pressure gauge-thermometer for measurement of pressure in tubing string in front of housing, upper electric valve for regulation of inflow from annular space in cavity of housing, pressure gauge-thermometer for measurement of annulus pressure, pressure gauge-thermometer for measurement of pump suction pressure and tubing string to wellhead. Development of well is performed in three stages with extraction of product via tubing string and annular space, only via tubing string and then only through annular space. Results of yields and water cut measurements are analysed. Interval of well is operated with lower water cut at shutdown interval with high water cut at initial high flow rate until bottom hole pressure and fluid level below optimum and during subsequent working flow rate with maintenance of stable bottom hole pressure. Well is operated to excess water cut of operated interval above water cut of second interval. Then both intervals are operated simultaneously and watering of both intervals is maintained at same level.EFFECT: improvement of oil resources withdrawal along horizontal shaft of production well.1 cl, 1 ex, 1 dwg

Element for downhole tool for extraction of hydrocarbon resources // 2588530
FIELD: oil and gas industry.SUBSTANCE: invention relates to element, which forms tool as such or its component for wells intended for extraction of hydrocarbon resources, including oil and gas. Element of downhole tool for extraction of hydrocarbon resources comprises a moulded body made of resin based on polyglycol acid, having weight-average molecular weight of at least 70,000 and effective thickness equal to or greater than 1/2 of critical thickness of surface decay. Constant speed of reduction of thickness in water depending on time is provided.EFFECT: creation of element on basis of degradable polymer with possibility of more accurate estimation of change of its mechanical strength during decomposition in time.7 cl, 4 dwg, 2 tbl

ethod for development of explored oil deposit // 2587661
FIELD: oil and gas industry.SUBSTANCE: invention can be used in development of low-explored oil deposit. During development of low-explored oil deposit drilling is performed with coarse grid of wells. Also, product is extracted through production wells, pumping of working agent through injection wells is performed. In drilled well seismic survey is carried out by non-longitudinal vertical seismic profiling with determination of zone of amplitudes of energy of reflected waves less than 80 standard units. Defined zone is accepted as shale-out zone in terrigenous reservoirs-non-reservoir. Further, transition zone is determined, having values of amplitudes of energy of reflected waves less than 80 to 120 standard units and zone of highly efficient collector with values of amplitudes of energy of reflected waves of more than 120 standard units. Method includes selecting a line separating transition zone and zone of highly efficient collector, determining thickness of oil-saturated formations in zone of highly efficient collector. Method then includes sealing existing grid of producers by drilling wells with horizontal bores in area of highly efficient collector with location in water-oil zone with oil-saturated strata of more than 3.5 m and pure oil zone with oil-saturated strata of more than 1.5 m. Horizontal boreholes are arranged opposite to line dividing transition zone and zone of highly efficient collector, and in parallel to section of said line opposite to which there is a well with horizontal shaft.EFFECT: increased oil output.1 cl, 1 dwg, 1 ex

Device for well development and affecting bottomhole formation zone // 2584254
FIELD: oil industry.SUBSTANCE: invention relates to oil and gas industry and is intended for affecting bottom hole formation zone and well development. Device includes working pipe, forming together with production string annular space, packer, disconnecting annular space with under-packer zone, jet pump, which suction chamber is connected to under-packer zone, and check valve connecting under-packer area with working pipe. Output of jet pump is communicated with working pipe equipped with bottom pressure gauge, connected by means of geophysical cable to ground logging station. Input of jet pump is communicated with annular space. For development of well jet pump is inserted and is equipped with check valve from below. Inserted jet pump has possibility of tight arrangement in housing, launched to well on working pipe. At wellhead working pipe is hydraulically connected with vessel equipped with blind vertical partition that separates reservoir into two sections of water and oil. In reservoir below there are two branches. First branch in vessel is made of water section and is connected with piston pump, which is hydraulically communicated with annular space. Second branch in vessel is made of oil section and is connected to collector for oil. Container opposite water section is equipped with upper and lower level sensors. When water level in tank rises to upper water level sensor piston pump supply in annular space is reduced. At reduction of water level in tank to lower water level sensor piston pump to annular space supply is increased. Under effect on bottom hole formation zone inserted jet pump has possibility of its extraction from well by means of catcher lowered into working tube on cable with gripping by outer annular recess made on upper end of inserted jet pump.EFFECT: technical result is simplification of device, higher reliability of its operation and improved quality of well development.1 cl, 2 dwg
ethod for increasing reservoir recovery generation waves on natural waveguides // 2582688
FIELD: mining.SUBSTANCE: invention relates to development of deposits of liquid hydrocarbons, specifically to methods for wave action on productive formations for intensification and increase productivity of sections of deposits with hard to recover or blocked reserves of liquid hydrocarbons. Method comprises preliminary measurement of geometrical and physical-mechanical properties of formation, based on which according to Frenkel-Bio model are calculated values of decrement of oscillation damping of transverse and longitudinal waves depending on frequency values of wave action. Wave action is performed on formation by generating waves with frequency corresponding to minimum decrement of attenuation. Process of wave action on formation is continued to ensure superposition of longitudinal and transverse waves in frequency band between minimum values of decrement of attenuation of longitudinal and transverse waves. This provides cleaning of pores of formation skeleton. Method includes successively changing frequency value of wave action and measuring productivity of formation. Optimum frequency is determined, at which formation productivity has maximum value, and wave action on formation, generating wave optimum frequency.EFFECT: technical result is increase of productivity of formations with deposit liquid hydrocarbons.1 cl, 2 tbl 2 dwg
Wave impact device for mineral deposits // 2582359
FIELD: mining.SUBSTANCE: invention relates to the development of mineral deposits, namely, to their intensification using wave action. Apparatus comprises at least one injector and at least one production well filled with process fluid to form a continuous liquid medium between the outlet of each injection well and the inlet of at least one production well. Source of wave action in each production well is in the form of a submersible pump with its power control unit having an input connected to the output of the source control wave action. Source of wave action in the injection well is made as a liquid flow regulator disposed at the inlet of the injection well in conjunction with the flowmeter. Output meter connected to the input of control unit for sources of action. Input of fluid flow regulator is connected to the output of the wave action control unit. Output of least one production well connected via the newly introduced measurement unit includes a sensor for the quantity and/or quality of the produced minerals from the input of the wave action control unit, forming a feedback control channel for wave action.EFFECT: object of the invention - intensification of production of minerals.2 cl, 1 dwg

ethod of destruction of asphaltic and paraffin deposits in wells fitted with rod deep well pumps and oil production well // 2581592
FIELD: oil and gas industry.SUBSTANCE: group of inventions relates to oil production from the production wells fitted with rod deep well pumps. According to the method on the pipe of the wellhead pack-off system located above the faceplate of the wellhead antigushing equipment or on the polished wellhead rod connected with a string of pump bars the vibroacoustic radiator is fixed together with the elastic uncoupler. The elastic uncoupler is a spring between the spreader bar of the rope suspension bracket and the polished wellhead rod. By means of this uncoupler the transfer of oscillations to the pumping unit is decreased. The vibroacoustic radiator is a low-sound radiator with a wide resonant band. Vibroacoustic oscillations are transferred to the string of pump bars, tubing, a production string and asphaltic and paraffin deposits. The output mechanical resistance of the vibroacoustic radiator is matched with time variable complex mechanical resistance of the load. For this purpose the vibroacoustic radiator is fixed on the named pipe or the rod in arbitrary manner, and its working frequency, amplitude and shape of modulating signal are adjusted in a wide low-frequency range both in continuous, and in radio pulse modes at control of amplitude and speed of excited mechanical oscillations.EFFECT: increase of overall performance of a production well.3 cl, 3 dwg
 
2551118.
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