Control method of development of hydrocarbon deposit

FIELD: oil and gas industry.

SUBSTANCE: according to the method a geologic structure is identified within the area of a deposit. Potential reservoir beds are identified in the section of rocks above the deposit, the direction of their highs - uprising and three-axis orientation of systems of subvertical fracturing is identified. Development and inspection wells are constructed with opening of the reservoir beds above the deposit height. Pressure and temperature survey is performed in the development wells and the composition of formation fluids is identified for all the wells. According to the results of the survey data depressurisation of the deposit is recorded. The inspection wells are constructed close to the wells intended for monitoring of sealing at the borehole annulus and the deposit in the direction of the subvertical fractures and uprising of the potential reservoir beds above the deposit. A change in pressure and temperature is identified for depth intervals of the reservoir beds on the real time basis.

EFFECT: reduced time for the detection of potential cross-flows of hydrocarbons to the above reservoir beds in result of the pressure failure in its cover and the borehole annulus of the wells in order to take measures on its elimination and prevention of potential blowouts to the surface.

1 dwg, 1 ex

 

The invention relates to the field of development of deposits of hydrocarbons and can be used to control the flow of hydrocarbons from mined deposits overlying the reservoir, with the possibility of subsequent emergency or catastrophic release (emission) to the earth's surface (land or sea).

Under the current rules of the development of oil and gas fields (national standard of the Russian Federation GOST R 53713-2009) in the process of their development monitored, whose main task is to assess the effectiveness of implemented system of development, technologies and implementation of measures for the extraction of hydrocarbons. In the control field development study including the state of the tightness of the production casing, the interaction of productive horizon with neighboring slit horizons and the presence of flows of liquid and gas between the layers of the developed facility (deposits) and neighboring objects. The tightness of the production casing, for example, is determined by geophysical surveys of the wellbore when you stop the production of hydrocarbons, and therefore such studies are conducted irregularly and usually, they are associated with capital repairs of wells.

The known method of monitoring the development of gas deposits, including�schy froze the current reservoir pressure in the operating and observation wells, the number and composition of the produced formation fluids, determination of the position of the gas-water contact and the study of the technical condition of wells and the construction of a network of additional observation wells in the aquifer sediments above the tires gas deposits, periodic sampling of additional monitoring wells produced water samples, determining in the sample the content of the gases or gas components of developed deposits and fixation depressurization gas deposits on the change of the measured content (volume and composition) (USSR Author's certificate No. 1640377, CL. EV 43/00, priority 28.04.89). Since the control method is implemented to develop the field, we can assume that prior to its development as a result of geological and geophysical surveys, including detailed seismic 2D and/or 3D, it was determined the geological structure of the environment in the area of deposits, identified potential reservoirs (aquifer sediments) in the context of rocks above the field, the direction of their raising (uprising) and spatial orientation systems subvertical cracks.

The disadvantage of this known method of control is that its implementation is fixed depressurization tires developed deposits only after some time prior to appearance and fixed�I reservoir fluids develop deposits in samples of fluids observation wells.

The technical problem of the invention described is to reduce the time to identify possible flow of hydrocarbons from deposits in the overlying reservoirs due to leakage of tyre and annulus spaces wells for the adoption of measures for their elimination and prevention of potential releases to the ground surface.

The stated technical problem is solved by a method of monitoring the development of hydrocarbons, including the determination of the geological structure of the environment in the area of deposits, identification of potential reservoir formations in the section of rocks above the field, the direction of lift (uprising) and spatial orientation systems subvertical cracks, construction and operational monitoring wells, conducting thermobaric research in production wells and composition of the reservoir fluids in all wells and fixation depressurization deposits on the results of these studies, observation wells constructed near the wells to monitor the integrity of their annulus spaces and fields, in the direction of orientation of vertical fractures with regard to the uprising of the potential reservoir and define them in changing temperature and pressure parameters in INTA�shafts depths of the reservoir.

The invention consists in the following.

During the development of oil and gas fields there is a need to control the tightness of the deposits from the stage of construction of the exploratory wells (which can then be translated into operational discharge), as during drilling due to the leakage annulus their spaces possible depressurization tires deposits (deposits) and the formation fluid flows deposits (primarily natural gas as the least viscous hydrocarbon) in the overlying reservoirs with possible emergency or catastrophic blowout on the surface of the earth. In most cases, the geological environment has the crack system, including vertical, which rocks have high permeability. Therefore, if you have broken the rocks with a master field system subvertical cracks on the field (and also in the productive deposits of the Deposit) in the case of leakage constructed wells formation fluid from the reservoir will be filtered with the greatest intensity in the plane of propagation of the crack system in the horizontal and vertical directions in the overlying reservoirs, further on these layers in the direction of their rebellion (lift), with�aplikasi in the dome with the formation of the so-called technogenic deposits. According to the proposed method of inspection observation well is being constructed in the immediate vicinity of the wells selected for monitoring the tightness of casing annulus of the well and the field. This observation well pitch in the direction from the monitored wells, coinciding with the orientation of vertical fractures and also taking account of the rebellion of the existing reservoir located above the tire field. The control is as follows: the well in a controlled, open field, measure formation pressure and temperature, and the composition of reservoir hydrocarbons, in observation well continuously record the pressure, temperature and composition of the formation fluid in the intervals of drilling a borehole reservoir (as a result of installing at specified intervals of the respective devices), with the formation fluid flows from the reservoir (depressurization) is judged by the change of the fixed parameters, such as the emergence of natural gas, which in addition to changing the initial composition of the formation fluid may be accompanied by a change in its temperature and pressure settings (usually by increasing pressure and temperature). Thus, the observation well is constructed in relation to controlled such that maximum ver�a chance to fix the flow of formation fluid from mined deposits in the overlying reservoirs in the event of depressurization. Fixation depressurization field allows you to take timely measures to prevent the pollution of natural resources and the environment due to the risk of cross-flows of reservoir fluids and output them to the earth's surface. Fixation depressurization of the field and its timely liquidation are particularly important (required) by operations for the development of fields with aggressive components in the composition of the reservoir fluids.

The proposed method is applicable for the development of fields, both on land and at sea, and in the latter case, it is the most important because of pressure loss in the field with the release of formation fluids into the aquatic environment hydrocarbons can quickly spread it with pollution, and in Arctic and subarctic seas, ice-covered, control over the development of the field is further complicated. It is particularly important application of the proposed method in the case that the Deposit (the Deposit) is characterized by abnormally high reservoir pressures (AHP), which increases the likelihood of seal failure and power cross-flows and emissions of hydrocarbons on the surface of the earth.

The drawing shows an example implementation of the described method of monitoring the development of hydrocarbons, where schematic�shows a section of the geological environment, specified by the orientation of the prevailing system of subvertical cracks where: SCR.R - controlled (exploratory) well, Geophys.N - observation well, Geophys.E - projected production well 1 - the field of hydrocarbons, 2 - tire field, 3 - reservoirs above deposits on mountain section, 4 - barrel well controlled, 5 - barrel observation wells, 6 - sensors for pressure, temperature and composition of the formation fluid. Arrows show possible directions of formation fluid flows from deposits in the overlying reservoirs.

An example implementation of the method

To monitor the development of the field 1 having a lid 2, after drilling an exploration well (SLE.P) was drilled observation well (SLE.N) with the opening of the reservoir 3 above tyre field. Moreover, observation well drilled in the vicinity of an exploration well in the plane identified in the process of exploration subvertical cracks in the interval from tyre field 2 to the overlying reservoir 3. Observation well built also in relation to exploration in the direction of the uprising (uplift) of the said reservoir. In the intervals of drilling observation wells reservoir flat vnutrikvartalny� devices on the cable 6 (see, for example, the device and method according to the patent of Russian Federation №2404362, CL. EV 49/08, G01N 30/02), allowing continuous logging of pressure, temperature and composition of the formation fluid in the place of installation of the devices. In built well (SLE.P) after opening the field 1 were measured reservoir pressure and temperature, and also determined the composition of the formation fluid. The well was put into trial operation to Refine the parameters field. After the construction of observation wells in it started monitoring the development of the field. In the process control parameters of the formation fluid at the intervals uncovered reservoir was recorded appearance in the reservoir-the reservoir above the tire Deposit formation fluid from the reservoir, as a result, it was concluded about the breach of containment casing annulus exploration well in the range of tyre field (for example, as a result of the incident on-site field seismic events), as well as on the need for insulation work in this interval.

When using the proposed method of monitoring the development of hydrocarbons is possible depressurization of the Deposit is recorded in observation wells in real time, i.e. continuously, therefore the possibility of its�belt to take measures to eliminate the negative effects of depressurization.

Method of monitoring the development of hydrocarbons, including the determination of the geological structure of the environment in the area of deposits, identification of potential reservoir formations in the section of rocks above the field, the direction of their rising and rising and spatial orientation systems subvertical cracks, construction and operational monitoring wells with the opening of the last reservoir above the field, conducting thermobaric research in production wells and determining the composition of formation fluids into the borehole and recording the pressure loss of the Deposit on the results of these studies, characterized in that the monitoring wells constructed near the wells to monitor the integrity of their annulus spaces and fields, in the direction of orientation subvertical cracks and rebellion potential reservoir above the field and define them in changing temperature and pressure parameters within the range of depths of occurrence of these reservoir in real time.



 

Same patents:

FIELD: oil and gas industry.

SUBSTANCE: while implementing the method a system consisting of temperature sensors and heat/cooling sources distributed along the well length are installed in a well. In order to determine the profile of formation a fluid inflow, when the well is operated for extraction distributed heat/cooling sources are switched on for the preset time using heat indicator marks and then the travel and change rate of heat indicator marks in the well is measured using temperature sensors. The flow travel rate in the well is calculated against the measured values, and the rate value is used for the determination of the well operational characteristics.

EFFECT: simplifying the method with the simultaneous increase of its data content.

5 cl

FIELD: oil and gas industry.

SUBSTANCE: invention suggests hydraulic pump smart device for oil production and acquisition and storage of data from the well bottom that comprises jet pump unit, the lower isolation valve and unit with electronic instruments, which form a united and integrated unit actuated by operating fluid injected to the well from the ground oil lifting, closure of the well bottom, recovery of pressure in the formation and lifting of the device to the surface. The invention also discloses the method for oil production, receipt and recording of data from the well bottom using the above device.

EFFECT: performance of one complex function consisting in lifting of fluid and recording of data from the well bottom by means of temporary closure of the well.

17 cl, 11 dwg

FIELD: oil and gas industry.

SUBSTANCE: development method of heavy oil or bitumen mine field with controlled production extraction includes construction of the top injector and bottom producer with horizontal sections placed one above the other, injection of heat carrier through the horizontal injector with bed heating by creation of steam chamber and extraction of the product through the bottom producer. Thermograms of steam chamber are taken, the chamber's warm-up state is analysed for uniform heating and available temperature peaks, and considering the obtained thermograms uniform heating of steam chamber is performed by changing zones of product extraction. Before start-up of extraction with permanent taking of thermograms heat carrier is injected to the below horizontal well until the layer between wells is heated. Thereafter thermograms are taken along horizontal boreholes of both wells with identification of interval with maximum temperature between the wells. Then measurement instruments are removed, heat carrier in injected to the injector and pump is run in to the above interval in the producer, product is produced by the pump till pressure communication is set between the wells. The pump is removed from the producer, a pump with fibre-optical cable is run in to the well in order to control thermogram along the whole length of producer and monitor pump movement to less heated intervals in process of oil or bitumen production.

EFFECT: usage of this method allows increase in oil recovery factor and open flow potential due to even heating of the steam chamber using standard equipment.

1 dwg

FIELD: oil and gas industry.

SUBSTANCE: method consists in pulse lighting and recording of walls of a casing string of a well by means of a pulse light source and a picture telecamera with further processing of the obtained video materials, as per which place and nature of damage to the wall of the well casing string is determined. Before visual investigations are performed, acoustic investigations of intensity of noise emission are performed as to depth and azimuthal angle of the well by means of a point-directed transducer of intensity of noise emission with a directivity pattern coinciding as to direction with the directivity pattern of the pulse light source. With that, recording of walls of the well casing string by means of the picture telecamera is performed when an output signal from the transducer of intensity of noise emission exceeds the specified threshold value.

EFFECT: improving performance of search of location places of damages to a casing string.

5 cl, 1 dwg

FIELD: oil and gas industry.

SUBSTANCE: invention refers to chemical and thermal treatment of a bottom-hole formation zone in developing high-viscosity oil deposits. A hollow cylinder rod is connected to a line of hollow pumping rods. A unit has also a working substance supply unit. This unit is stationary and isolated from a well production gathering line. An inside below an intake screen of the pump, between the cylinder wall and the surface of the hollow rod is divided into two sections. The cylinder rod is common for both sections and extends through a cylinder rod packing. The packing is provided between the sections. The bottom of the cylinder is connected to a tail piece with outlet holes. The tail piece comprises a hollow discharge rod. It is connected to the hollow rod of the pump. A non-return spring-loaded valve is arranged on the outlet of the hollow discharge rod of the pump.

EFFECT: unit comprises the differential sucker-rod pump, a cylinder of which is connected to a flow column; it ensures more reliable operation of the bore-hole sucker-rod pump unit and reducing serviceability.

1 dwg

FIELD: mining.

SUBSTANCE: proposed system comprises surface data receiving and processing unit connected in supply circuit electrical cable - downhole motor (DHM) with downhole telemetry unit (TU) port. Said TU has a through lengthwise hole to control and to transmit to surface data receiving and processing TU, data covering the parameters of top and bottom beds. Note here that TU port is connected via serial data collection and transmission unit, communication interface and power supply with its extra port whereto connected is well bottom bed parameters metering unit (MU) via sealed connector. Said extra port is intended for transmission of requested date from MU to TU. MU and TU are interconnected via sealed connector fitted in TU case cut-out Said telemetry serial data collection and transmission unit can generate packages of data on top and bottom bed transducer parameters from MU and convert said data for transmission to surface data receiving and processing unit via downhole motor supply cable for said data to be recognized for transmission to user.

EFFECT: better manufacturability of system assembly and higher reliability of operation.

7 cl, 5 dwg

FIELD: oil and gas industry.

SUBSTANCE: group of inventions is related to the area of well drilling and intended for transfer of well data to the surface through an electromagnetic communication line. The method for transfer of well data through an electromagnetic communication line is suggested by means of current excitation in the formation surrounding the lower part of the drill string. At that current is excited in the formation by EMF of a free-running generator connected to the string and a coaxial ring isolated from the string. Besides, an additional coaxial ring isolated from the string is introduced to the upper assembly of the pipe string and collection of alternating voltage is done from this ring as induced in the formation close to the string surface by flowing current generated by the radiating ring. At that value of the above voltage is modulated by EMF of the free-running generator controlled in compliance with coded bottomhole data. The device for implementation of the above method is also claimed.

EFFECT: improving reliability of data transfer from the bottomhole through the electromagnetic communication line, expansion of its scope of application and simplification of the device design for manufacture.

2 cl, 2 dwg

FIELD: mining.

SUBSTANCE: in killed well temperature is measured, and the temperature change rate is measured in the depth intervals located within the productive formations, and in the depth intervals located in immediate proximity from productive formations. In the depth intervals located within the productive formations, the sections are separated, the temperature change rate in which is much higher than the temperature change rate in the depth intervals located in immediate proximity from productive formations. The numerical model of temperature change in a killed well is developed which takes into account the influence of formation fluid filtering at the temperature change rate in the killed well, the measurements results are compared with the results of numerical simulation and using the best agreement of measurement results and simulation results the filtration rate of formation fluids in the depth intervals located within the of productive formations are determined.

EFFECT: identification of depth intervals, where fluid flow occurs, and estimation of rate of their filtering in the location of observation well.

8 cl, 7 dwg

FIELD: oil-and-gas industry.

SUBSTANCE: invention relates to hole surveying and is intended for centring of instruments at their displacement along the borehole. The proposed device for centring of the downhole instruments comprises the main and extra systems of convex plate springs. Ends of the said main system of springs are articulated with extreme support sliders siding on a downhole instrument support guide. The number of springs of the extra system equals that of the main system. Note here that the ends of every spring of the said extra system can slide over the guide of the appropriate spring of the main system.

EFFECT: decreased sizes of downhole instruments, expanded applications.

2 cl, 1 dwg

FIELD: mining.

SUBSTANCE: as per one version of implementation, the method involves well shaft drilling by a drilling bit, determination of an axial load on the bit during drilling of the well shaft, determination of pressure drop in the working surface area of the drilling bit during drilling of the well shaft and determination of the corrected axial load on the bit as per a certain axial load on the bit and a certain pressure drop.

EFFECT: creation of improved drilling bit and method allowing to correct changes in measurement results of an axial load and torque, which occur due to pressure drop in the drilling bit.

20 cl, 6 dwg

FIELD: oil and gas industry.

SUBSTANCE: invention suggests hydraulic pump smart device for oil production and acquisition and storage of data from the well bottom that comprises jet pump unit, the lower isolation valve and unit with electronic instruments, which form a united and integrated unit actuated by operating fluid injected to the well from the ground oil lifting, closure of the well bottom, recovery of pressure in the formation and lifting of the device to the surface. The invention also discloses the method for oil production, receipt and recording of data from the well bottom using the above device.

EFFECT: performance of one complex function consisting in lifting of fluid and recording of data from the well bottom by means of temporary closure of the well.

17 cl, 11 dwg

FIELD: chemistry.

SUBSTANCE: method comprises drying a polymer solution until complete evaporation of water; heating the polymer formed after drying the polymer solution, and determining the temperature range of active decomposition of the polymer at a given heating rate, as well as the degree of decomposition of the polymer in said temperature range; drying, performing thermal analysis in the temperature range which includes the temperature range of active decomposition of the polymer, and calculating weight loss of a weighed amount of the sample of porous medium and a weighed amount of the same sample of porous medium after pumping the polymer solution; determining the weight concentration of the polymer that has penetrated the porous medium based on the obtained values.

EFFECT: high accuracy of the obtained data and rapid analysis.

6 cl, 3 dwg

FIELD: oil and gas industry.

SUBSTANCE: method involves destruction of massif of a hydrate-containing manifold with high-pressure water jets, formation from destructed material of pulp in a near-bottom volume covered with a dome, lifting of the pulp containing gas and gas-hydrate onto a floating structure via a pipeline and separation of the pulp into gas, water and solid material with gas transfer to a state suitable for transportation. According to the invention, massif of the hydrate-containing manifold is converted to a solid body-liquid fine suspension with gas-hydrate particle size of 10-20 mcm. For that purpose, it is influenced with high-pressure jets formed in the near-bottom volume covered with the dome. Besides, the volume of the pulp formed in this volume is treated with an ultrasound with parameters causing cavitation effects in it. A hydrate-containing suspension is formed with content in it of a disperse phase of gas-hydrate of up to 20-25%. Capacity of destruction devices of massif of the hydrate-containing manifold is controlled proportionally to pressure in the pipeline in its near-bottom section. An ice pulp formed at dissociation of the gas hydrate is used for cooling of compressed gas - a product of dissociation of a gas-hydrate pulp.

EFFECT: increasing well performance efficiency of a gas-hydrate deposit.

6 cl, 5 dwg

FIELD: oil and gas industry.

SUBSTANCE: according to the method in a watered part of a formation at first remedial cementing is made to cut the inflow of stratal water off and to isolate the watered part of the formation by a cement plug setting. A geophysical survey is performed in the non-watered part of the formation. Intervals are identified with bigger permeability of the productive formation areas. An assembly with an end-to-end channel is run in at the drill string and set by means of an anchor packer device. It is oriented towards one of the permeable areas of the productive formation. Mill equipment with a downhole drilling motor, flexible shaft and cutter is run in to the well at a flexible tube. An opening is cut in the production string wall with the use of an oil-based solution. The mill equipment is run out from the well. A jet nozzle is run in to the well up to a discharge outlet of the guide assembly. Cement stone and rock is washed out behind the production string so that a radial borehole is formed. The radial borehole treatment is made through the jet nozzle by an acid composition so that a cavern is formed. The flexible pipe with the jet nozzle is lifted out of the well. The guide assembly is rotated, for example, per 180 degrees and similar operations are performed to tunnel the next radial borehole. The guide assembly is lifted to the height of the next interval in the permeable areas of the productive formation and the similar operations are performed to tunnel the next radial boreholes. Up to the upper radial boreholes of the well an oil string is run in and the above string is made of tubing strings with the area of a clearance hole equal to the sum of all the clearance holes in the radial boreholes. The well is brought to operation.

EFFECT: improved efficiency of the method due to the removal of conditions for swelling of clays contained in the productive formation at tunnelling the radial borehole in low-permeable terrigenous deposits of water-swelling clays.

3 ex, 6 dwg

FIELD: oil and gas industry.

SUBSTANCE: according to the method a removable whipstock is installed. Then a window is cut in boring case. An offshoot is drilled from the main borehole. Offshoot drilling is made with running in of the boring case, its continuous cementing, perforation and provision of required reliability of attachment in the area of offshoot tracking. At that behind-the-casing flows of gas and liquid mixture are excluded. To this end upon window cutting a cement ring is cut in the boring casing and adjoining soil is cut as well in direction of offshoot drilling forming a cavern with diameter exceeding diameter of the offshoot. The cavern is poured with solid sealing compound and offshoot is drilled through the cavern. Downhole pumping equipment is placed in the main borehole and oil is extracted from the main borehole and offshoot.

EFFECT: increased oil extraction from offshoot at operated main borehole.

3 cl, 2 dwg

FIELD: oil and gas industry.

SUBSTANCE: invention refers to the oil and gas industry and can be used in particular to prolong anhydrous operation conditions of oil producers. The substance of the invention: a device comprises a pipe string lowered into a well, a packer with a sealing member and a flow shutdown mounted therein; a hollow body comprises a pipe concentric with its axis. From above, this pipe is rigidly connected to the pipe string, and from below - to a piston. The pipe and piston are axially movable in relation to the hollow body from the flow shutdown. The hollow body from the flow shutdown is blind off from below; its holes are inclined at 120° to each other in three vertical planes along the perimeter of the hollow body. The first vertical plane comprises two holes above and below the sealing element of the packer, respectively. One hole is formed in the second vertical plane below the sealing element of the packer. The third vertical plane has one hole above the sealing element of the packer. The piston has a slot configured to provide an alternative connection of the holes of the vertical planes to the pipe inside when the pipe string and piston move axially and rotate about the hollow body of the flow shutdown. The hollow body of the flow shutdown is provided with an outer long slot inside from below, while the piston at the bottom has three inner long grooves inclined at 120° to each other along the perimeter; the outer long slot of the hollow body of the flow shutdown can be fixed in any of the three inner long grooves of the piston.

EFFECT: simplifying the operational structure of the device, improving its reliability and enhancing the same.

3 dwg

FIELD: oil and gas industry.

SUBSTANCE: invention refers to chemical and thermal treatment of a bottom-hole formation zone in developing high-viscosity oil deposits. A hollow cylinder rod is connected to a line of hollow pumping rods. A unit has also a working substance supply unit. This unit is stationary and isolated from a well production gathering line. An inside below an intake screen of the pump, between the cylinder wall and the surface of the hollow rod is divided into two sections. The cylinder rod is common for both sections and extends through a cylinder rod packing. The packing is provided between the sections. The bottom of the cylinder is connected to a tail piece with outlet holes. The tail piece comprises a hollow discharge rod. It is connected to the hollow rod of the pump. A non-return spring-loaded valve is arranged on the outlet of the hollow discharge rod of the pump.

EFFECT: unit comprises the differential sucker-rod pump, a cylinder of which is connected to a flow column; it ensures more reliable operation of the bore-hole sucker-rod pump unit and reducing serviceability.

1 dwg

FIELD: oil-and-gas industry.

SUBSTANCE: invention relates to recovery of said well located at multihorizon field. Proposed process comprises injection of isolating composition via well tubing string and fitting of "liquid" packer below tubing string shoe. Then, flow tubing above "liquid" packer is filled with killing fluid. Tubing string is withdrawn from the well. Deflector wedge is fitted inside tubing string. Lateral opening is cut in tubing string above overlaying high-pressure productive bed. Side hole is bored through said bed to extend through its entire depth to make side hole face occur nearby said high-pressure productive bed. Casing string with filter is lowered into bored side hole. Casing string is cemented above filter to the roof of top high-pressure productive bed and said wedge is withdrawn. Hanger with latch joint arranged at its inner surface is lowered on temporary string. Said hanger is fitted inside flow string under side opening. Oil string provided with side opening is lowered into flow string till interaction with latch device so that side openings of both strings are located opposite each other. Then, influx from lateral hole is initiated to remove killing fluid from the well. Then, liner with centring funnel at its shoe and packer hanger at its top is lowered on flexible pipe inside oil string to "liquid" packer. Solvent is injected via said liner. Said solvent destructs said "liquid" packer its residues falling on the face. Now liner is lowered to bottom holes of perforation interval of the bottom low-pressure productive bed. Liner is suspended in oil string above side opening of oil string. Flexible pipe is withdrawn from the well to place the well in operation.

EFFECT: efficient recovery.

7 dwg

FIELD: transport.

SUBSTANCE: method for installation of rapid-moving eduction column includes passing the rapid-moving column into a well, engagement of key for interaction with occlusion with nipple occlusion, extending interacting with profile key on rapid-moving column to interact with corresponding stopping profile in well shaft wall and thus supporting the rapid-moving column. In this method, interaction of the key with nipple occlusion causes extending the key interacting with profile into engagement with stopping profile.

EFFECT: higher reliability of holding the rapid-moving column while keeping relatively large flow diameter of the column.

29 cl, 8 dwg

FIELD: oil and gas industry.

SUBSTANCE: method involves dilution of salt rock with fresh or subsaline water by cyclic action on the formation, each of which includes pumping of a working agent to the saline oil formation through a well, closure of the well for the time of salt rock dilution, extraction of liquid from the formation through the same well. Cycles of action on the deposit are repeated till full coverage of the saline formation by action before opening of oil deposits contained in it and production of all the extracted oil deposits. Water pumping to the formation is performed at maximum possible constant bottom-hole pressure till reduction of the well water intake capacity by 2-8 times in comparison to its value at the pumping beginning, and extraction of liquid from the formation is performed at minimum possible constant bottom-hole pressure before the liquid with volume of at least 1.1-1.5 volumes of the fresh or subsaline water pumped to the formation earlier is removed to the surface.

EFFECT: increasing permeability of a saline formation throughout the area of its propagation, increasing productivity of production wells, increasing the coverage of the formation by action, volume of the removed oil deposits and acceleration of development rates.

4 cl, 1 tbl

FIELD: oil extractive industry.

SUBSTANCE: method includes lowering a tail piece into well with temperature, electric conductivity and pressure sensors placed on tail piece along its length. Pressure sensors are used in amount no less than three and placed at fixed distances from each other. After that, continuously during whole duration of well operation between maintenance procedures, temperature, conductivity of well fluid, absolute value of face pressure and difference of pressures along depth of well in area of productive bed are recorded. Different combinations of pairs of pressure sensors are used for determining special and average values of well fluid density. When absolute pit-face pressure is lower then saturation pressure for well fluid by gas and/or when average values of density deviate from well fluid preset limits and/or when its conductivity deviates from preset limits, adjustment of well operation mode is performed.

EFFECT: higher efficiency, higher safety.

2 cl

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