Multilayer oil deposit development method

FIELD: oil and gas industry.

SUBSTANCE: during development of multilayer oil deposit working fluid is injected through injectors with common well screen. Extraction of the reservoir product through producers is also performed with common well screen. The upper layer is developed in the mode of injection to withdrawal ratio by injection of working fluid at discharge pressure according to injectivity of the stratum. A pit is arranged close to the injector and working fluid is pumped through this pit to the injector with increased injection pressure sufficient for entry of working fluid both to the upper and lower strata. Producers are operated in the mode of permanent bottomhole pressure. Upon reaction of the producers to increased pressure of working fluid injection the development is continued in the mode of injection to withdrawal ratio by injection of working fluid. Injection to withdrawal ration is redistributed for two strata simultaneously from producers with high water cut and high bottomhole pressure to producers with low water cut and low bottomhole pressure. For this purpose at producers with increasing water cut operation time of pumping equipment is reduced at permanent bottomhole pressure. At producers with low water cut operation time of pumping equipment is increased at permanent bottomhole pressure.

EFFECT: improving oil recovery of the deposit.

1 ex

 

The invention relates to oil industry and may find application in the development of multilayer oil deposits.

Known pump system for simultaneous or separate injection of the displacing agent in two intervals of the well, including dual-channel estuarine valves, the main column of lift pipes, equipped with the basic packer, which is installed between the layers, and communicated with the sub-packer space, an additional column of tubing, placed concentrically outside the main and include additional outside packer, which is installed above the upper stratum, and primary and secondary columns of tubing communicated respectively with the primary and secondary discharge lines, which are communicated through distribution hub to the injection tubing. Main packer is installed between the groups of layers with different petrophysical properties, and discharge line communicated through the column tubing with a group of layers with lower permeability, equipped with an additional high-pressure pump, lowered into a hole, which communicates with the discharge conduit, and optionally with the conduit. Between the distribution node and the high-pressure pump discharge line communicated with each other by a pipe with a valve. Basic and supplementary�Lyalina the discharge line in parallel can be connected after the branch pipe with the same discharge lines such wells. Pump is used to flow to the well displacing agent low pressure pipelines and protected against short-term disruptions in the flow of the displacing agent in the pumping station through the use of sounding with the high-pressure pump and parallel lines of injection made with the possibility of communication in cases of breach of flow of the displacing agent from the discharge pipe or pit (patent RF №2393342, EV 43/14, EV 33/122, publ. 27.06.2010).

A method of developing oil deposits, which carry out the determination of petrophysical characteristics of the reservoir, determining the dependence of the value of the bottomhole pressure and reservoir pressure from reservoir characteristics, identify optimal intervals of head pressures and formation pressures, injection working agent through injection wells and selection of products through production wells on the filtering mode, the respective optimum values of the discharge pressure, and formation pressure between the zones of injection and extraction. Each injection well and a production well are provided with sensors downhole pressure at least once a day measure downhole pressure in all wells and calculate the formation pressure near wells. Stop the injection and extraction and/or changing operation modes �of Quain support in the reservoir optimal from the point of view of maximum oil recovery reservoir pressure. This plan is well shut for repairs and undertaking measures to maintain the reservoir pressure at the site of the development, regardless of its changes in the process of repair of the borehole (RF patent No. 2336413, publ. 20.10.2008 - prototype).

Known technical solutions do not allow to develop oil reservoir with high recovery.

In the proposed invention solves the problem of increasing oil recovery of the reservoir.

The task is solved in that in the method of developing multilayer oil deposits, including the injection of working agent through injection wells General filter, selection of products produced through production wells total filter according to the invention, are developing the top layer in the compensation mode selection by the injection of the working agent in the discharge pressure in accordance with the injectivity of the reservoir near the injection well organized pit and pumped working agent through a hole in an injection well with high pressure injection, which is sufficient for admission of the working agent in the upper and in the lower reservoir, production wells operate at a constant bottomhole pressure, after the reaction producing wells to increase the pressure of injection of the working agent continue to develop in the compensation mode selection the fix slave�what agent, but produce a redistribution of compensation selection for the two layers simultaneously from producing wells with high water cut of produced products and high downhole pressure to producing wells with low water content and low bottom-hole pressure for producing wells with increasing water cut of produced products reduce the time of operation of pumping equipment at a constant bottomhole pressure at the producing wells with low water cut increase the time of operation of pumping equipment at a constant bottomhole pressure.

Summary of the invention

In the development of oil deposits paid little attention to the ratio of the volume injected through injection wells operating agent and volumes of selected products produced through production wells. Meanwhile prolonged deviation from the optimal compensation selection leads to changes in reservoir pressure, premature water cut of produced products or shortfalls of oil. And in that and in other case decreases the oil recovery reservoir. In the proposed invention solves the problem of increasing oil recovery of the reservoir. The problem is solved as follows.

When developing multilayer oil deposits carried out the pumping of working agent through injection wells General filter, the selection of reservoir �catalogue via production wells total filter. When the current injection pressure operating pressure determined by the injectivity of the reservoir, it only takes one top layer having a higher permeability than the lower.

Develop the top layer in the compensation mode selection by the injection of the working agent in the discharge pressure in accordance with the injectivity of the formation. Near the injection well organized pit and pumped working agent through a hole in an injection well with high pressure injection, which is sufficient for admission of the working agent in the upper and in the lower layer. Production wells operate at a constant bottomhole pressure. After the reaction producing wells to increase the pressure of injection of the working agent continue to develop in the compensation mode selection by the injection of the working agent, but produce a redistribution of compensation selection for the two layers simultaneously from producing wells with high water cut of produced products and high downhole pressure to producing wells with low water content and low bottom-hole pressure for producing wells with increasing water cut of produced products reduce the time of operation of pumping equipment at a constant bottomhole pressure at the producing wells with low water cut increase the time of the pumping equipment�tion at constant bottomhole pressure.

An example of a specific implementation

Developing multilayer oil field with the following characteristics.

The top layer of D0: depth 2069-2072 m, reservoir pressure 14 MPa, reservoir temperature 36°C, the thickness of the layer of 3 m, a porosity of 13% to 19%, permeability from 18 to 205 MDA, oil saturation from 60 to 75%, the viscosity of the oil 3.9 MPa*s, the oil density 0.86 g/cm3. Collector - siltstone and argillaceous Sandstone.

The lower stratum of the DB: depth 2094-2097,8 m, reservoir pressure 14 MPa, the temperature is 36°C, the thickness of the layer of 3.8 m and a porosity of from 11 to 22%, permeability from 3 to 247 MDA, oil saturation from 54 to 75%, the viscosity of the oil 3.9 MPa*s, the oil density 0.86 g/cm3. Collector - siltstone - Sandstone.

The site deposits with 2 injection wells and 4 production wells are developing technologies with the injection of produced water as a working agent and selection of reservoir production through production wells.

Carry out the injection of the working agent through injection wells General filter when pumping pressure at the mouth of 12 MPa and a pick-up from 50 m3/day. Selection of reservoir production through production wells total filter. When the current injection pressure operating pressure determined by the injectivity of the reservoir, it only takes one lower layer of the DBhaving a higher permeability than the upper�.

Develop the top layer of D0in the compensation mode selection by the injection of working agent about 110% at discharge pressure in accordance with the injectivity of the formation.

Near the injection well organized pit and pumped working agent through a hole in an injection well with high pressure injection of the order of 16 to 20 MPa. With the high pressure of injection of the working agent is supplied in either the upper or lower layer in the allocation of injection volumes, respectively 40/60%. Production wells operate at a constant bottomhole pressure, whereby in the well not maintain a constant liquid rate and bottomhole pressure regardless of flow rate. After the reaction producing wells to increase the pressure of injection of the working agent continue to develop in the compensation mode selection by the injection of the working agent, but produce a redistribution of compensation selection for the two layers simultaneously from producing wells with high water cut reservoir products of about 60-90% and high bottom hole pressure of about 8.5-9.5 MPa to producing wells with low water cut about 12-45% and low bottom-hole pressure of the order of 6.5-8.5 MPa, which on producing wells with increasing water cut of produced products for 5-10% reduce the time of operation of pumping equipment in the range of from 2 to 20 cha�s at a constant bottomhole pressure, on producing wells with low water cut about 12-45% increase the time of operation of pumping equipment in the range of from 1 to 6 hours at a constant bottomhole pressure.

As a result, the oil recovery of the Deposit increases by 2.8% and reaches 32%.

Application of the proposed method will allow to increase oil recovery of the Deposit.

Method of developing multilayer oil deposits, including the injection of working agent through injection wells General filter, selection of products produced through production wells total filter, characterized in that develop the top layer in the compensation mode selection by the injection of the working agent in the discharge pressure in accordance with the injectivity of the reservoir near the injection well organized pit and pumped working agent through a hole in an injection well with high pressure injection, which is sufficient for admission of the working agent in the upper and in the lower reservoir, production wells operate at a constant bottomhole pressure, after the reaction producing wells to increase the pressure of injection of the working agent continue to develop in the compensation mode selection by the injection of the working agent, but produce a redistribution of compensation selection for the two layers simultaneously from producing wells with high Obvodny�of formation of products and high downhole pressure to producing wells with low water content and low bottom-hole pressure, on producing wells with increasing water cut of produced products reduce the time of operation of pumping equipment at a constant bottomhole pressure at the producing wells with low water cut increase the time of operation of pumping equipment at a constant bottomhole pressure.



 

Same patents:

FIELD: oil and gas industry.

SUBSTANCE: according to the method geophysical survey of exploratory wells is performed by crossed dipole shear sonic imager. Oriented core is selected with further determination of directions of natural fracturing. Regional directions in maximum stress of oil-saturated rock are defined. According to findings injectors are placed along the regional directions in maximum stress. Producers are placed in between injectors thus forming developing method. Part of injectors occurred in fault zones and closer than 200m is introduced into operation as producers with their further transfer to injectors. When watering is higher than break even point and when it is required to maintain reservoir pressure at the deposit producers are transferred to injectors. Transfer of wells is made so that they form rows of injectors step by step along regional directions in maximum stress of oil-saturated rock and provide even oil displacement.

EFFECT: increased reservoir recovery due to more efficient and sound placement of well pattern within the area of oil deposit considering tectonic and geomechanic conditions of pay rocks occurring.

3 cl, 3 tbl, 8 dwg

FIELD: oil and gas industry.

SUBSTANCE: group of inventions relates to the field of oil industry and can be used for enhanced oil recovery of the reservoir in the development of water-flooded reservoirs with viscous oil and bitumen at a late stage of development. The method comprises opening the reservoir with the ability to transfer the production well into the injection one, the reservoir processing, keeping the hole without any influence, intake of oil from the reservoir. At that a system of microwave electromagnetic generators with radiation frequency of 2.5 GHz is lowered into the injection well, connected to the slot antenna using the feeder. The length of the slot antenna is selected equal to the thickness of the aquifer of the reservoir. In the mode of injection, the water injection into the reservoir is carried out with simultaneous influence on the reservoir with microwave electromagnetic field, the radiation power is determined by the time of heating of the water injected in the downhole to the desired temperature. When filling 5-10% of the volume of the pore space of the formation, the well is maintained, the well is transferred into the production well, and the liquid intake from the production well is carried out.

EFFECT: increase of the effectiveness and economical efficiency of development of water-flooded reservoirs of high-viscosity oil, intensification of oil production in water-flooded reservoirs of high-viscosity oil by increasing the coverage with influence to the reservoir with heating in the bottomhole area of the reservoir of the production wells.

2 cl, 3 dwg

FIELD: oil and gas industry.

SUBSTANCE: under this method the field is drilled according to row system with triangle grid of wells. Work agent is injected in the injection wells. Oil production is performed from production wells. At initial stage of the field development the production reservoir is presented by two horizons, if divided by central separating row of injecting wells with spacing between wells at least 300 m. Central separating row is arranged along line of maximum pay structure, the injection wells in it are made with opening by common filter of the both horizons. The closest first row of the production wells is drilled at distanced from the central row at least 500 m. Other areas of the reservoir are drilled with spacing between wells 300-400 m. After injection of the central row of the injection wells to 0.4-0.7 unit fractions of the pore volume to nearest rows of the production wells at least 90% wells of the central row are shutdown. After oil withdrawal at the entire field to 90% of initial oil productive capacity between the central separating row of the injection wells and nearest row of the production wells the sealing row of the production wells is drilled. Wells of the central row are switched to production at top horizon. During watering of the production wells of the first row to 98% they are switched to water injection.

EFFECT: increased oil recovery factor of the field.

2 ex, 2 dwg

FIELD: oil and gas industry.

SUBSTANCE: under method the first device is installed in the horizontal well. Firth fluid is injected in the first horizontal well via the first device. HCs production is ensured from the second horizontal well under the first well. Second fluid is injected to the third well shifted to side from the first and second wells to displace fluids in the reservoir to the second well. At that HC production from the second well is continued. Hydraulic connection is ensured between the first, the second and the third wells. Pressure in the first well is increased using the second fluid injected to the third well. First well is closed when its pressure is increased by the second fluid to pressure sufficient to displace HCs from the second well during HCs production.

EFFECT: increased method efficiency.

29 cl, 10 dwg

FIELD: oil and gas industry.

SUBSTANCE: method involves construction of horizontal producers covering the field, and horizontal injectors. Displacement agent is injected through injectors, and products are swept by producers. Horizontal production wells are arranged parallel to each other. Horizontal injector is positioned between horizontal sections parallel to them. Injection starts from bottomhole. When intake capacity of reservoirs is decreased at the bottomhole of horizontal injector to minimum profitable level, non-operating section of horizontal shaft is isolated in series in direction from the bottomhole to the beginning of horizontal injector wellbore. Horizontal producers are drilled in permeable interlayer at 3-6 m distance below the reservoir bottom and at least at 10 m distance above oil-water interface. Horizontal injector is equally spaced from horizontal sections of producers by a design pattern distance. Displacement agent is injected with reservoir pressure rise by 10-20% compared to recovery zone. After time period sufficient to recover and stabilise frontal zone of liquid injected to the reservoir, operation may return to previous intervals. Horizontal sections of producers are broached in two intervals at a distance preventing hydrodynamic connection of the wells. Products are recovered in turns. Production intervals are switched when products reach minimum profitable water cut level.

EFFECT: increased oil recovery due to stabilisation of frontal zone of liquid injected to reservoir, extended application scope of horizontal wells in various field development conditions.

6 dwg, 1 ex

FIELD: oil-and-gas industry.

SUBSTANCE: invention relates to the oil-producing industry, in particular to oil field development with flooding. According to the method the displacement agent is injected and oil is withdrawn through the system of injection and production wells. The flooding mode is changed during the development. The displacement agent is injected into the injection well in intensive mode. Using the surface measuring instruments that are a part of an automated process control system the change of extracted oil volume growth depending on the displacement agent injection volume growth until the moment of fast drop of the extracted oil volume is monitored in real time. Then the displacement agent injection volume after which the named drop occurred is recorded. Further injection into the injection well is performed in the volume below this pre-set value.

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1 ex, 6 dwg

FIELD: oil and gas industry.

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EFFECT: increased efficiency of clusters well control.

2 cl, 1 dwg

FIELD: oil-and-gas industry.

SUBSTANCE: this process comprises measurement of injection well capacity, feed of products of one or several production wells for preliminary water disposal. Measured are density of green oil and gas, green oil water content are measured in the well. Here said products are divided into partially dewatered oil, gas and water. Partially dewatered oil and gas are fed in gathering main. Disposed water is fed into injection well. Compatibility of disposed water with water of seam wherefrom pumping from injection well is made is defined. If threes are compatible, injection well is equipped with the device to create water pressure sufficient for water injection into seam, for example, with electrically-driven rotary pump. Said device allows varying of feed capacity by frequency-controlled drive for said pump. It is set to minimum feed to define the compliance of disposed water quality with the seam geological properties. At poor water quality, it is directed to gathering main or, at sufficient quality, it is forced into injection well. Disposed water amount is defined. Then, device feed capacity is increased either continuously or in stepwise manner to create water pressure. It is increased unless disposed water quality satisfied the seam geological properties.

EFFECT: higher process efficiency.

3 cl, 1 dwg, 1 ex

FIELD: oil-and-gas industry.

SUBSTANCE: this device comprises hollow case with cover that has working fluid feed channels and bottom with discharge channel that features cross-section larger than that of working fluid feed channel for communication case inside with well bottom zone, moving working member that makes with said case the working chambers. Said working member is shaped to truncated ellipse fitted on the case at antifriction bearing and composed of axle with relationship between arms of top and bottom ends equal to 1:2. Aforesaid working member has the channel to communicate working chamber, antifriction bearing with the case bottom discharge channel. Nozzle is arranged under said bottom with communicating discharge channel and radial equal-cross-section area. Total cross-section area of said holes equals that of discharge channel. Cover bottom surface and bottom upper surface are composed of cylinder generatrix to allow displacement of working member top and bottom arms there over and isolation of working chambers.

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2 dwg

FIELD: oil-and-gas industry.

SUBSTANCE: method comprises cyclic decrease and increase of pressure in a formation by pumping of water through injection wells and oil withdrawal through production wells. Into the formation through injection wells the mineralised water is pumped periodically in the volume of 0.1-5 of pore volume of the formation and fresh water in the volume of 0.1-5 of pore volume of the formation. The transition to fresh water pumping after mineralised water pumping is performed without gradual decrease in mineralisation. The structure and concentration of salts of the pumped mineralised water are remained at the level of the formation one. The cycle of pumping of waters with different mineralisation is repeated many times. Fresh water is pumped until the moment when decrease of intake capacity of the injection well exceeds the allowable production level - critical drop of reservoir pressure in target impact areas. The mineralised water is pumped until the moment when the injection well sets to initial or close to initial operating mode which depends from the flow rate of the injected liquid and well head pressure.

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2 dwg

FIELD: oil and gas industry.

SUBSTANCE: group of inventions is referred to versions of a control unit and a produced fluid flow meter for a multipay well. According to the first version the unit comprises a body limited from bellow by a docking device with channels for formation fluid flows and from above by a docking device with adjustable valves installed on it in the quantity equal to that of operated formations. In the body there are interconnected cups, which are coupled hermetically by their hollow butt end to the upper docking device, and cylinders installed by the opposite end in the respective channels of the lower docking device thus forming a tubular annulus and to detached longitudinal channels intended for fluid flows from the respective formations at the wellhead. In the cups there is a crossover seat with radial channels in the cup wall along both sides of the seat. Below the crossover seat from the side of the cup end there are radial channels. Above the crossover seat there is a needle valve made as a slide; at the latter there is a gasket, which facilitates the sealed movement of the needle valve in the cup from an electric drive placed in the sealed part of the cup and fixed in the docking device transferring reciprocal motion to the needle valve in regard to the crossover seat. Electric drives of the needle valves are equipped with devices measuring linear movements of the needle valve with Hall sensors. In the longitudinal channels of the cylinders there are instruments coupled functionally by a cable to a telemetry unit and/or well power supply and/or control point placed in the cup wall so that it may transmit control commands to adjustment valves and data on process parameters of the fluid in the well formations through a cable connector. In the second version of the unit in the cup below the crossover seat there is a channel axial to the crossover seat connecting the longitudinal channel to the tubular annulus and the instruments are placed in the wall of each cylinder and interconnected by a cable in the tubular annulus.

EFFECT: improved reliability for the dual operation of the multipay wells.

4 cl, 2 dwg

FIELD: oil and gas industry.

SUBSTANCE: group of inventions refers to mining and can be used for selective flow regulation in a multilateral well. Pipe string system is formed for selective regulation of separate fluid mix flows with varying speeds for well construction, injection or production of mixes of fluids, gases and/or solid particles that can be injected to, or produced from one or several close zones of ground bore, ground cavern, hydrocarbon or geothermal reservoir. Fluid mix running through radial passage in distribution reducer of the pipe string system between the strings and at least one other pipe can be regulated by at least one flow regulation element connected to a concentric and/or annular passage closest to axis line. Fluid medium transfer can be adjusted selectively in different configurations of one or several mainly hydrocarbon and/or mostly water wells below the common main wellbore and wellhead equipment.

EFFECT: enhanced efficiency of flow regulation in a multilateral well.

20 cl, 123 dwg

FIELD: oil and gas industry.

SUBSTANCE: method includes mounting in the well of a pump unit consisting of flow column, driven centrifugal pump and reciprocating pump, a cable feeding the electric drive of the centrifugal pump from the ground control station, a packer with cable entry separating strata in a certain interval of the well, and submersible telemetry systems related by a cable with the control station. When mounting is complete, the above pumps are started simultaneously or separately in order to pump out fluid from strata through the flow column to the well surface with potential recording of their flow rates at the control station. Depending on volume of gas extracted by the lower stratum of the well fluid pumping out by the centrifugal pump is made either by direct flow through the flow column or through a nozzle of liquid jet ejector installed downstream the reciprocating pump with potential gas cap releasing from below-packer annulus cavity of the well; to this end turbulent fluid flow at output of the centrifugal pump is transferred to laminar flow. When fluid pressure drops at output of the centrifugal pump and/or power consumed by the pump is exceeded, then underground washing of the centrifugal pump is made. To this end the reciprocating pump and liquid jet ejector are removed from the pump unit by the installation tool and a bypass unit consisting of coaxial pipes with communicating radial channels is installed instead of the ejector. Then from the well mouth along the flow column through coaxial cavity and radial channels of the bypass unit washing fluid is pumped to below-packer annulus cavity of the well; the centrifugal pump is washed under pressure of washing fluid through input module and the used fluid from the latter is directed under remaining pressure through coaxial cavity and radial channels of the bypass unit to the well moth though below-packer annulus cavity of the well. Upon completed washing of the centrifugal pump the bypass unit is dismounted and liquid jet ejector and reciprocating pump are installed at its place, then pumping of the fluid from strata to the well surface is continued.

EFFECT: reduced labour costs for maintenance of the well.

2 cl, 3 dwg

FIELD: oil and gas industry.

SUBSTANCE: method includes separate run and installation in well of the pipe string with packer system for two production reservoirs comprising packers, between packers pipe, perforated branch pipe and polished insert. At that top packer has directing funnel and maximum possible diameter of the through channel sufficient for pipes and devices assembly passage. Separate run of pipes string equipped with electric submerged pump, tail, bottom secured pump equipment, or remote control unit, or tight or untight casing of the electric drive presented by string of pipes or rods, on which as least one packer separated reservoir liquid flows, controlled electrical or electromechanical valves regulating or disconnecting fluid supply from the reservoirs to the well, units of sensors monitoring work parameters of the reservoirs, sensors are located within the perforation depth of each production reservoir or above perforation depth of each production reservoir. At that pressure and temperature sensors are located under solenoid or electromechanical valves, thus ensuring regulation of the bottom hole pressure and control of the reservoir pressure and temperature. Humidimeters and flowmeters are located above the solenoid or electromechanical valves or under the solenoid or electromechanical valves. Control of the solenoid or electromechanical valves and information exchange with units of sensors of work parameters of the reservoirs are performed over the both separate electric line having at least one core, or as forth core of submersed power cable of the electric pumps, or via separate electric line instead of the forth core of the submerged power cable of the electric pumps, or from "zero point" of the electric submerged pump, or from the remote control system of the electric submerged pump. If electric line is routed over casing of the submerged motor can or can not be used the insert out of electric line with small diameter closed against mechanical damages by the protective enclosure or by protectors, or can be closed or unclosed against mechanical damages by the enclosure installed similarly to the cooling enclosure of the electric-centrifugal pump. The tail can be equipped or unequipped with emergency disconnector with shear elements designed for definite load, with stroke compensator of thermobaric changes of length of pipes string. Based on the data provided by sensors the optimal modes of simultaneous separate or successive operation of the productive well reservoirs are determined. Determination of the optimal operation modes of the reservoirs and their further updating are performed by operation of valve units that control operation of the reservoirs under automatic or manual modes, automatic system of operation control of the well system ensures remote on-line monitoring of the field development system and to make corrections to operation modes of the well reservoirs.

EFFECT: improved efficiency of well control upon simultaneous and separate operation.

4 dwg

FIELD: oil and gas industry.

SUBSTANCE: installation comprises underground equipment assembly run in the well using the pipes string, including funnel-positioner, lower packer, reducer-positioner, device of injection distribution, top packer, extension. Device of injection distribution contains casing and removable parts, is equipped with to independent pressure gauge, middle independent pressure gauge, and bottom independent pressure gauge. Top and bottom unions are installed in the removable part of the device of injection distribution with possibility of both unions removal by one round run operation.

EFFECT: assurance of possibility of information acquisition on injection pressure upstream and downstream each union for long time period, reception of reliable data on injection mode, increased process reliability.

4 cl, 2 dwg

FIELD: oil and gas industry.

SUBSTANCE: aggregate includes lifting string, cable, liner, packers, electric immersed pump with check valve for product extraction with input unit and electric motor, a housing encasing the motor with cable and input unit and connected to the liner featuring several channels each entering a well section, pressure gauges with functional connection to aggregate control unit, switch valve with case and shutting unit, positioned downstream of the housing and connecting a well section with the housing space through respective channel. Switch valve features a stem with lengthwise channel connecting space under the valve to the housing, and the check valve is mounted in the lengthwise stem channel. The stem travels by a limited longitudinal path together with the check valve down under effect of differential pressure in the lift string and liner channel entering a well section, or up under effect of the produced fluid flow. The stem can engage with actuator that can open liner channels in turns while shutting the other channels upon each reciprocal travel of the stem.

EFFECT: enhanced efficiency of dual bed operation in a well.

5 cl, 3 dwg

FIELD: mining.

SUBSTANCE: method comprises pumping oil from a lower layer by the centrifugal pump with feeding under pressure of liquid jet ejector into the nozzle. Using this ejector the oil from the upper layer is simultaneously pumped with oil from the lower layer through the column of oil-well tubing to the wellhead. At that the oil from the lower layer is pumped to the nozzle of the liquid jet ejector with laminar flow of oil flow with low gas content. Pumping oil at the wellhead is carried out with a centrifugal pump with the pressure given by the condition of the pressure distribution on the rise of the oil masses from the lower layer to the nozzle of the liquid jet ejector and oil mixture from both layers along the column of oil-well tubing and the work of the liquid jet ejector. The flow cross-sections of the nozzle and the mixing chamber of the liquid jet ejector are set directly proportional to production rate of the lower layer and the production rate of both layers of the wells, respectively.

EFFECT: increase in reliability of operation of the well.

3 cl, 2 dwg, 1 ex

FIELD: oil and gas industry.

SUBSTANCE: pump packer system includes a packer lowered into the well and put between formations and a pump unit above it, which consists of an electric motor with a cable, hydroprotection, telemetering, lower and upper pumps with receiving stations and a casing with a cable entry, the upper end of which envelopes the receiving station of the lower pump, and the lower end is located below the electric motor. The system is provided with a housing and a branch pipe with side outlet channels, the first one of which is connected from above to the lower end of the casing, and the second one is connected from above to the electric motor and from below to the packer. With that, the branch pipe is compacted in the housing and thus disconnects the cavity of the casing from the upper formation and connects it through side outlet channels to the lower formation. With that, the branch pipe is provided for fluid of the lower formation either with a control controlled with the electric motor or with a flow meter or with a mechanical check valve. The upper pump is connected with the receiving station to the lower pump, and the latter that is located above the casing is connected with the receiving station to the hydroprotection of the electric motor. With that, the receiving station of the lower pump is made in the form of an inlet module or a gas disperser, and the receiving station of the upper pump is made either in the form of an inlet module provided with a longitudinal through internal channel for a fluid flow of the lower formation and a cutoff with a side inlet channel for the fluid flow of the upper formation, which is controlled by electric, electromagnetic or hydraulic action, or in the form of an inlet module or a gas separator provided from below with a branch pipe with side outlet channels at backside of the well for fluid flow of the lower formation. The packer is either of mechanical action and is installed by creation on it, without any transfer to the casing, of the specified value of axial load from the weight of the pipe string with further maintenance or removal of this load after tight fit of the packer, or is of hydraulic action, provided with a disconnector and installed between formations before the pump unit is lowered by creation inside the packer of excess pressure, or is of hydrodynamic action and provided inside the well with a pulse tube transmitting discharge pressure of the upper pump to the hydraulic cylinder of the packer, or is of electric or electromagnetic action and is connected to the electric motor.

EFFECT: improving reliability and efficiency of a pump unit at simultaneous and separate operation of two formations of one and the same well.

5 dwg

Downhole pump // 2549937

FIELD: oil-and-gas industry.

SUBSTANCE: proposed unit comprises mouth power unit, downhole hydraulic drive with moving stepped plunger connected with said power unit via hydraulic channels to transmit sign-variable load via drive medium thereto. Downhole pump is connected with flow string. Besides, it comprises extra downhole pump connected with extra flow string. Said plunger represents a three-step design. Hydraulic drive chambers arranged between plunger steps and its case have hydraulic communication with top and bottom borehole displacement pumps. Plunger steps are arranged in separate adjacent chambers connected with drive hydraulic channels. Plunger mid section and extreme sections are sealed at outlet from every adjacent section.

EFFECT: higher reliability and efficiency of well operation.

4 cl, 6 dwg

FIELD: oil and gas industry.

SUBSTANCE: group of inventions relates to oil and gas industry, in particular to operation of the oil fields with high watercut of the produced product. As per this method the total number of field wells with high watercut is determined. Geometrical location of the source deposit in relation to the absorbing horizon is determined for each well. Injectability of the absorbing horizon is determined for each well. Day volume of produced water is determined for each well. Based on the obtained data, at least on the geometrical location of the source deposit in relation to the absorbing horizon, and on condition that injectability of the absorbing horizon exceeds the day volume of the produced water, the type of double action pump system is determined. This is determined for each well on condition to ensure the further injection of the produced water to the absorbing above or below deposit. During injection of the produced water to the above deposit less volume is supplied to the flowline in comparison with volume pumped out using the well subsurface pump unit. Under wellhead tee the additional seal of the wellhead stock is installed to accept pressure. During injection of the produced water to the below deposit the subsurface pump unit is equipped with tail and additional plunger for water linked with main plunger and ensuring the possibility to overcome the absorbing deposit pressure. At least one field well with high watercut is operated using the bottomhole pump unit with definite pump system.

EFFECT: increased operation efficiency due to use of more effective gravity separation of water and oil in well.

4 cl, 4 dwg

FIELD: oil and gas extractive industry.

SUBSTANCE: device has operation columns of upper and lower well zones, placed eccentrically one inside the other in upper zone of well, double airlift column, mounted in upper well zone, and double airlift column, connected to operation well of lower well zone, separation column, mounted coaxially to operation column of upper well zone, and cementation pipe. According to invention, in a well with significant power of non-productive zone it is equipped with additional separating column with cleaning channels for lowering drilling tool therein and drilling well to lower well zone with removal of drilling slurry by double airlift column of upper zone through cleaning channels. Additional separating column is combined coaxially with operation column of lower well zone and is rigidly fixed to separation column.

EFFECT: higher efficiency.

1 dwg, 3 cl

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