Method of cluster drain and disposal of associated water

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

 

The invention relates to the field of equipment for oil industry, namely to methods cluster of the dumping and disposal of produced water at oil fields in the late stage of development, and may find application in pressurized systems, the extraction and collection of products of oil wells.

The known method of a pad discharge and disposal of produced water, comprising feeding the product of one or more production wells in the well for primary water discharge measured quantities of crude oil and gas as well as water cut of crude oil, density of oil and water flowing into the borehole prior to the release of water, division of production on partially dehydrated oil, gas and water, the direction of the partially dehydrated oil and gas into a collecting reservoir, the flow discharged water into an injection well or conduit that is described in the device according to the patent for useful model No. 96176, IPC EV 43/38, Publ. 20.07.2010.

The disadvantage of this method is the lack of efficiency, due to the fact that poorly controlled quality supplied to an injection well or conduit water, and its number is constantly.

The closest technical solution according to the essential features of the claimed invention and is selected as a prototype� is the way Bush relief and disposal of produced water, including measuring the injectivity of the injection well, the production flow of one or more production wells in the well for primary water discharge measurement of number densities of crude oil and gas as well as water cut of crude oil, density of oil and water flowing into the borehole prior to the release of water, division of production on partially dehydrated oil, gas and water, the direction of the partially dehydrated oil and gas into a collecting reservoir, the flow discharged water into an injection well in which pressure is injected into an injection well water may vary /patent for useful model No. 102056, IPC EV 43/20; Publ. 10.02.2011/.

The disadvantage of this method is the lack of efficiency, due to the fact that poorly controlled quality supplied to the injection well water, and its number is constantly.

The purpose of the claimed invention is to increase efficiency.

This object is achieved in that in the claimed method of a pad discharge and disposal of produced water, including metering injectivity of the injection well, the production flow of one or more production wells in the well for primary water discharge measured quantities of crude oil and gas as well as water cut of crude oil, density of oil and water flowing into the borehole DL� primary water discharge the fission products inside the partly dehydrated oil, gas and water, the direction of the partially dehydrated oil and gas into a collecting reservoir, the flow discharged water to the injection well, according to the invention determine the compatibility of flushed water from the water reservoir into which is injected from the injection wells, compatibility with water injection well is equipped with a device for creating water pressure sufficient for injection of water into the reservoir, made with the possibility of changes in supply and installed at a minimum pitch, determine the quality of discharged water geological conditions of the reservoir, with a poor quality water dropped she goes into a collecting reservoir, upon satisfactory quality of the discharged water, it is sent to the injection well, measure the amount coming from the injection well water dropped, then the selected constant or variable produces an increase in the supply of devices for the water pressure, and this increase is produced as long as the quality of the discharged water meets the geological conditions of the reservoir. In addition, in cases of intermittent and/or inclusion of oil wells Bush can create pressure reset output water from the well prior to throw�and above water, than the collection reservoir. In addition, in the cases of high gas content in crude oil or ingress of gas tubes can be carried out degassing of the discharged water, for example, by vibrations.

As a device for creating water pressure sufficient for injection into the reservoir, can be used pump-"shifter", or horizontal pump installation, or the pit with hanging it in the installation of electric centrifugal pump.

As a device for creating water pressure, made with the possibility of changes in supply, can be used or the VFD, or replacement of the pump at the pump with another flow, or diverting a portion of the incoming fluid into a collecting reservoir.

Determine the compatibility of flushed water from the water reservoir into which is injected from the injection wells, to exclude the injection into the reservoir is incompatible with water and avoid the clogging which improves the efficiency.

Equipment compatibility with water injection well device to create water pressure sufficient for injection of water into the reservoir, such as electric submersible pump-"Changeling", allows the injection of water into the reservoir without the use of the system of reservoir pressure maintenance, which ensures increased efficiency.

Implementation of the device for creating water pressure with the possibility of changes in supply, such as variable frequency drives for centrifugal pump-"shifter", allows you to change the amount of injected water in the reservoir that provides increased efficiency.

Determination of compliance of the quality of discharged water geological conditions of the reservoir helps to avoid injection into the reservoir of contaminated water that provides increased efficiency.

Install minimum flow devices to create water pressure allows you to conduct research throughout the range of flow that provides increased efficiency.

Direction with a poor quality water dropped into a collecting reservoir to avoid contamination of the reservoir, which provides increased efficiency.

Direction, with satisfactory quality of discharged water to the injection well allows the pumping of water quality that provides increased efficiency.

Measurement of the amount coming from the injection well flushed water allows you to carry out activities for the rational use of subsoil resources, improving efficiency.

The choice of constant or variable pitch feed increase allows you to increase the information content downloads, ensure that�Ivan doesn increase efficiency.

The increase in the supply of devices for the water pressure to the selected step allows to reduce energy consumption, improving efficiency.

The implementation of an increased supply of devices for the water pressure as long as the quality of the discharged water meets the geological conditions of the reservoir, allows to reduce energy consumption and increase the amount of injected water that provides increased efficiency.

Creating pressure reset output water from wells for primary water discharge is higher than in the collection reservoir, allows in some cases to reduce the possibility of occurrence of emergency situations, improving efficiency.

The implementation of the degassing of waste water, for example, by vibrations of the elements of the downhole installation of water discharge (for creating waves) for separation of dissolved gas from water can improve water quality, enhances the effectiveness.

The proposed method cluster reset and disposal of produced water is carried out by the following sequence of operations;

1) measurement of injectivity of the injection well;

2) determine the compatibility of flushed water from the water reservoir into which is injected from the injection wells;

3) compatibility with water equipping nagnetic� - filled borehole device for creating water pressure, sufficient for water injection, for example an electric centrifugal pump-"Changeling";

4) implementation of the device for creating water pressure with the possibility of changes in supply, such as a variable frequency drive for centrifugal pump-"shifter";

5) set the minimum flow for the device to create water pressure, which prior to the receiving water is running in "idle" mode;

6) production flow of one or more production wells in the well prior to water discharge;

7) measurement of number densities of crude oil and gas as well as water cut of crude oil, density of oil and water flowing into the well prior to water discharge;

8) the division is in the hole for preliminary water incoming products on the partially dehydrated oil, gas and water;

9) the direction of wells for primary water discharge partially dehydrated oil and gas to the manifold Assembly;

10) determination of compliance of the quality of discharged water at the exit of wells for primary water discharge to the geological conditions of the reservoir, which is scheduled injection;

11) submission with a poor quality reset output water from the well to pre-vent water dropped into a collecting reservoir;

12) when filing satisfactory�th quality of discharged water at the exit of wells for primary water discharge to the injection well;

13) measurement of the amount coming from the injection well flushed waters;

14) work in this mode for a certain period of time, such as weeks, with periodic, for example 2 times a day, monitoring the quality of discharged water;

15) the choice of constant or variable step increase in the feed device to create water pressure;

16) an increase in the supply of devices for the water pressure to the selected step;

17) repeat operations 6)...14);

18) repeating steps 16 and 17) until then, until the quality of the discharged water meets the geological conditions of the reservoir.

19) the establishment, in cases of intermittent and/or inclusion of oil wells Bush pressure reset output water from wells for primary water discharge is higher than in the collecting reservoir (this operation is also switched on or in operation 11)).

20) implementation in the cases of high gas content in crude oil or ingress of gas tubes degassing of waste water, for example by vibrations of elements of the downhole installation of water discharge (for creating waves) for separation of dissolved gas (this operation is also switched on in step 10)).

Example

One possible embodiment of the device for implementing the inventive method cluster reset and recycled at�utno produced water are shown in figure 1.

To well installation preliminary water 1 is connected to the pipeline supply of products 2, the outlet conduit partially dehydrated oil and gas 3 and the water outlet conduit 4. The water outlet conduit 4 comprises a device for determining the quality of water 5 and the valve 6. The outlet conduit partially dehydrated oil and gas 3 is connected to the water outlet conduit 4 by-pass line 7 with valve 8. The water outlet conduit 4 is connected with the discharge bore 9 through a column of pump-compressor pipes 10, On the column of pump-compressor pipes the pump 10 is suspended-"shifter" 11. The outlet of the column tubing 10 is located below the packer 12.

The device implementing the claimed method of a pad discharge and disposal of produced water, operates as follows.

In borehole installation preliminary water 1 pipeline supply of products 2 products of oil wells - water oil and gas mixture. At the pump-"the Changeling" 11 sets the minimum flow (for example, 35 kHz in the range of frequency variation 35-60 Hz with increasing frequency, increases flow) and it is running in "idle" mode. In this case, the valve 6 is closed and valve 8 is opened. In borehole installation preliminary water 1 there is a division of the incoming vodanet�gas mixture on the partially dehydrated oil, gas and water. Partially dehydrated oil and gas are discharged through the outlet conduit 3. Discharged water at the water outlet conduit 4 flows through the bypass line 4 to the outlet conduit partially dehydrated oil and gas 3. Evaluate the quality of discharged water device for determining the quality of water 5. If the quality of the discharged water meets the geological conditions of the reservoir, which is fix, the valve 6 is opened and valve 8 is closed. Water enters the pump-"shifter" 11 in the injection well 9. In the pump-"pervertish" 11 creates the water pressure sufficient for injection into the reservoir, and then she's on the column tubing 10 is fed into the zone of the well below the packer 12. After operation for embodiments of the method of cluster reset and disposal of produced water within a certain time period, such as weeks, the pump-"shifter" 11 increase (e.g., up to 40 Hz in the range of frequency variation 35-60 Hz) and repeat the operation.

Thus, the claimed method of a pad discharge and disposal of produced water effectively prototype by controlling the supply to the injection well water and control its flow. The proposed method cluster reset and disposal of produced� excludes water injection into the reservoir is incompatible with water. The proposed method cluster reset and disposal of produced water eliminates injection into the reservoir of contaminated water.

1. The way Bush relief and disposal of produced water, including metering injectivity of the injection well, the production flow of one or more production wells in the well for primary water discharge measured quantities of crude oil and gas as well as water cut of crude oil, density of oil and water flowing into the borehole prior to the release of water, division of production on partially dehydrated oil, gas and water, the direction of the partially dehydrated oil and gas into a collecting reservoir, the supply of water dropped into the injection hole, characterized in that determine the compatibility of flushed water from the water reservoir, in which the pumping of the injection wells, compatibility with water injection well is equipped with a device for creating water pressure sufficient for injection of water into the reservoir, made with the possibility of changes in supply and installed at a minimum pitch, determine the quality of discharged water geological conditions of the reservoir, with a poor quality water dropped she goes into a collecting reservoir, with satisfactory quality of discharged water, it is sent to the injection well, �amerat the number of arriving to the injection well water dropped, then with the selected constant or variable produces an increase in the supply of devices for the water pressure, and this increase is produced as long as the quality of the discharged water meets the geological conditions of the reservoir.

2. A method according to claim 1, characterized in that the pressure of discharged water at the exit of wells for primary water discharge is higher than in the collecting reservoir.

3. A method according to claim 1, characterized in that the degassing is carried out of the discharged water, for example, by vibrations.



 

Same patents:

FIELD: oil-and-gas industry.

SUBSTANCE: in compliance with first version, separator comprises housing with protective cartridge, input shaft, auger, separation device, swirling chamber arranged between auger and separation element and axial wheel fitted inside swirling chamber. Besides, it includes extra working axial wheel and guide fitted on the shaft ahead of said auger. The latter is fitted in protective cartridge and has central bore for shaft to extend there through while swirling chamber length is no larger than auger length In compliance with second version, separator comprises housing with protective cartridge, input module, shaft, auger separation device, axial wheel and swirling chamber arranged above said auger. Besides, it includes extra working axial wheel and guide fitted on the shaft ahead of said auger. The latter is fitted in protective cartridge and has central bore for shaft to extend there through while swirling chamber length is no larger than auger length Axial wheel is arranged ahead of separation device.

EFFECT: better separation, higher reliability.

6 cl, 1 dwg

Borehole separator // 2547533

FIELD: oil and gas industry.

SUBSTANCE: borehole separator contains a gas gathering chamber connected with well cavity, a gas pre-separation assembly with spiral winding in form of a screw outside, creating the flow channel connected by holes in the screw body with its axial channel, a flow divider, a fluid drainage branch, a partition, a connecting branch. The device has a parker connected with a stem, in its axial channel a seat is installed. The fluid drainage branch is equipped with support washer and is connected by top end with the flow divider equipped with supply channels hydraulically connected the screw axial channel with the sleeve cavity rigidly connected with the flow divider and installed creating the ring chamber with connecting branch hydraulically connected with the drain channels in the flow divider with the axial channel of the fluid drainage branch. The flow divider is installed inside the connecting branch and is equipped with stem having baffle plates, at its top end the partition and seating head with process groove are installed. The screw axial channel is permanently hydraulically connected by hole in the fluid drainage branch body with its axial channel.

EFFECT: increased efficiency of fluid separation from gas/fluid flow with its discharge to well under was/water boundary.

3 dwg

FIELD: oil and gas industry.

SUBSTANCE: method involves lowering of a pipe string with a filter below a well liquid level, extraction of the production from the well, separation of oil and water in the well shaft, water pumping to another formation, and lifting of oil to the surface. A filter represents an annular tube; an internal tube has a hydrophobic surface with a degree of hydrophobic properties of at least 99%, with capillary holes with a diameter of not more than 2 mm and density of at least 50 holes per metre. The lower part of the internal tube allows no water passage. The external tube has a hydrophilic surface with a degree of hydrophilic properties of at least 99%, with capillary holes with a diameter of not more than 2 mm and density of at least 50 holes per metre. In the lower part of the filter there installed is a packer between a casing string and the external tube for sealing of this space, and between the external and internal tubes of the filter there left in the lower part is space for liquid passage. Liquid penetrates into the space between the internal and the external tubes of the filter, where it is filtered through the capillary holes, thus being separated into oil and water.

EFFECT: improving efficient separation of oil and water in a well shaft; improving efficiency of water flooding and increasing oil recovery of a deposit.

2 dwg

FIELD: oil and gas industry.

SUBSTANCE: method involves lowering to a shaft of a production well below a liquid level of a pipe string with pumps, as well as with filters installed on pipe ends, recovery of the product from the lower productive formation, separation of oil and water in the well shaft, water pumping to the upper formation, and oil lifting to the surface. Into the well there lowered are two filters below the upper formation, each on an individual pipe string. Filters represent pipes with capillary holes with a diameter of not more than 2 mm and density of at least 50 holes per metre. With that, one filter on the pipe string has a hydrophobic surface with a degree of hydrophobic properties of at least 99%, and the other filter on the other pipe string has a hydrophilic surface with a degree of hydrophilic properties of at least 99%. The upper formation is cut off from above and from below with packers so that no liquid can flow via an annular space from the lower formation to the upper formation, and the pipe string with a filter with a hydrophilic surface is perforated opposite the upper formation. Liquid is filtered through the capillary holes of the filters, thus being separated into oil and water.

EFFECT: reduction of water flooding of the recovered product and increase of oil recovery of a productive formation.

1 dwg

FIELD: oil and gas industry.

SUBSTANCE: invention is referred to the sphere of operation of multipurpose wells, mainly to sandy oil wells, and is intended for treatment of the formation fluid from sand and mechanical impurities. The method for removal of sand and mechanical impurities in a flow of oil, water and gas includes catchment of sand from a flow of oil, water and gas, accumulation of sand and mechanical impurities in receiving hoppers. Catchment of sand and mechanical impurities from a flow of oil, water and gas is implemented mechanically due to reduced pressure and shock losses based on Bord effect intensified by Coanda effect and assumes installation in a flow of oil, water and gas the device design consisting of sand and mechanical impurities receiving hopper and pressure differentiator, which mechanical specifications allow maximum development of the above effects. The device may be installed in a pumped flow or a flow moved by own pressure both upwards and downwards any pumping mechanisms, at that it is envisaged to install one or several in series devices for complete treatment of a flow of oil, water and gas from sand and mechanical impurities.

EFFECT: reliable catchment of sand and mechanical impurities in a flow of oil, water and gas.

1 dwg

FIELD: oil and gas industry.

SUBSTANCE: unit includes the wellhead equipment, concentrically located tubing strings of two diameters with electrocentrifugal and jet pumps in the production casing of the well. There is a separating camera located in the bottom part of the well bore under the centrifugal pump, equipped with the sealing housing. The unit has the channel for passing of the separated oil connecting the annular space above the pump with the separating camera, and inlet holes for entering the separated water. The sealing housing of the electric centrifugal pump from below in the interval of the separating camera is equipped with the inlet device made as the liner damped from below. The liner is divided into sections with the inlet holes. At the level of each inlet hole the liner is equipped with a glass used as a hydraulic lock for petroleum drips and inlet of water from the separating camera. The inlet holes are located in a single row along the liner and are made with the diameters diminishing in each subsequent section upwards. The gap between the housing and production casing of the well is used as a channel for passing of petroleum drips. The tubing string of the greater diameter in the wellhead equipment is connected to the water line, and tubing string with the smaller diameter - with the oil line. The bottom of the string with the smaller diameter is tightly installed in the upper cylindrical camera of the commutator installed in the tubing string with the greater diameter at the depth below the working level of fluid in the well. The commutator has vertical peripheral channels for passing through them of the upward flow of water and bottom cylindrical camera for placement of plug-in jet pump, the output of which is interconnected with the upper cylindrical camera. Meanwhile the possibility of supply of working fluid into the jet pump from the centrifugal pump, and pumped off fluid - along the side channel of the commutator from the annular space of the well through the check valve located from the external party of the commutator is provisioned.

EFFECT: downhole separation of oil from extracted product of the well and separate lifting of oil and water to the surface during inter-well pumping-over of water for maintaining of formation pressure.

2 cl, 3 dwg

FIELD: oil and gas industry.

SUBSTANCE: method includes measurement of yields for the upper and lower formations and formation pressure, as well as degree of water cut in the lower formation. At that each tube of the flow string is equipped preliminary with an acoustic converters and controllers installed at its length mid with its own control code for the purpose of communications with the system telemetric module, and during the period of short-term stop of the centrifugal pump, besides measurement of yields for the upper and lower formations and formation pressure against level and pressure build-up curves, according to results of continuous polling of acoustic converters and controllers boundaries of gas-oil and oil-water levels are determined upon stratification of the three-phase mixture in the tubing string, as well as production volume for each of the three components in the mixture and its water cut.

EFFECT: improved accuracy for determination of yields and water cut for each developed formation of a multipay well.

1 dwg, 1 tbl

FIELD: oil-and-gas industry.

SUBSTANCE: set of inventions relates to in-well hardware and methods of in-well separation of fluids and solids as well as to preparation of well fluids and solids separation system. In-well device comprises separation system with separator including well fluid inlet, oil light channel, water flow channel, solids channel and detachable flow constrictor arranged in solids channel to facilitate separation of well fluid.

EFFECT: facilitated separation of well fluids and solids and their processing.

20 cl, 10 dwg

FIELD: oil-and-gas industry.

SUBSTANCE: invention can be used for maintenance of seam pressure at water transfer between wells. Proposed plant comprises oil-well tubing with electric rotary pump and flushing check valve lowered in flow string, annulus above said pump for accumulation and reservation of separated oil, separation chamber arranged at well borehole bottom above said pump, flow channel communicating said annulus with said separation chamber, water inlets and outlets. Note here that said pump is equipped with outer sealing jacket to communicated pump inlet with intake device arranged in separation chamber and consisting of shank plugged at its bottom and separated into sections with inlets. Shank is equipped with barrel arranged level with every inlet to intake separated water in said intake device and trap oil drops. Note here that said inlets are arranged in row along said shank and feature diameter decreasing in every next section and upward. Said flow channel is composed by clearance between said jacket and flow string.

EFFECT: simplified design, higher reliability and quality of separation.

2 dwg

FIELD: oil and gas industry.

SUBSTANCE: in the installation comprising a flow string with a centrifugal pump run in to the production string and connected to the water line at the wellhead equipment, a separating chamber in the lower part of the well bore under an electric-centrifugal pump equipped with a sealed case, a channel for separated oil passage that communicates annular space of the well with the separating chamber, inlet ports for separated water according to the invention the case of the electric-centrifugal pump is made so that it connects hydraulically suction of the electric-centrifugal pump with an input device located in the separating chamber and consisting of the shank plugged at the lower end and divided into sections with inlet ports, at that at the level of each inlet ports the shank is equipped with a cup performing functions of the separated water input to the input device and function of hydraulic lock for oil drops, at that inlet ports are located in one row along the shank with a decreasing diameter in each subsequent section in upward direction, and the channel for oil drops passage serves as a gap between the case and production string of the well. In order to lift separated oil from the annular space to the surface the tubing string has a larger diameter and the tubing string of less diameter is placed in it and the upper part of the latter is fixed rigidly to the oil line while its lower part is inserted hermetically in the upper cylindrical chamber of the switch mounted in the tubing string of a larger diameter at the depth below dynamic fluid level in the well, at that the switch is equipped with vertical peripheral channels for teeter water passage through it and with the lower cylindrical chamber for location of the inserted jet pump consisting of a nozzle, a mixing chamber and diffuser, which output is communicated with the upper cylindrical chamber. Operating fluid to the jet pump comes from the electric-centrifugal pump and the pumped fluid from the switch side channel from the well annular space via a back-pressure valve located at the switch exterior. In order to seal the inserted jet pump in the lower cylindrical chamber its case is equipped with sealing glands and a clamp hollow cylindrical screw at the outside. The jet pump case has radial openings under entry to the mixing chamber and a circular bore at the outside. The installation ensures oil separation from water practically in any quantity of the fluid produced from water supply wells due to potential use of the device without limitation of its rational length. Use of the installation allows maintenance of injectors intake capacity due to more qualitative treatment of intake water from oil and production of additional volume of oil from water supply wells. The installation also allows economically feasible use of a wide range of highly watered oil wells with water cut of 95%-99% as water intake donors considering their territorial location in the oil deposits, where maintenance of formation pressure is required by crosswell water pumping.

EFFECT: downhole separation of oil from the extracted product and separate lifting of oil and water to the surface at crosswell water pumping aimed to maintain formation pressure.

3 cl, 3 dwg

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.

EFFECT: higher efficiency of stationary pulse injection of fluid.

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.

EFFECT: increase of oil recovery of formations due to increase of their coverage.

2 dwg

FIELD: oil and gas industry.

SUBSTANCE: method comprises run in the production well below fluid level of the pipes string with pumps, and with filters installed at pipe ends, product recovery from top production deposit, oil and water separation in the wellbore, water injection to the bottom deposit, oil lifting to surface. Two filters are run to well on separated pipe strings. Filters are pipes with capillary holes with diameter 2 mm max, and density 50 holes/m min. One filter has hydrophobic surface with hydrophobic degree 99% min, the another filter has hydrophilic surface with hydrophilic degree 99% min. Parker is installed above the top deposit to seal the annulus. Filters are made with length not below the bottom deposit roof. Filter with hydrophilic surface is made with large length then the filter with hydrophobic surface such that the parker installed between the production string and filter with hydrophilic surface will be above the bottom deposit roof, and end of the filter with hydrophobic surface will be above this parker. The parker does not permit the fluid from the top deposit flow to the bottom deposit via the annulus. Moving from the top production deposit to the wellbore the fluid enters the annulus, where it is filtered via the capillary holes of the appropriate filters with hydrophobic and hydrophilic coatings separating to oil, that entering via the filter with hydrophobic surface in the pipes string by the pump is lifted to surface, and to water that entering via the filter with hydrophilic surface in the another pipes string by the pump is pumped in the bottom deposit.

EFFECT: increased efficiency of oil and water separation in the wellbore, increased efficiency of waterflooding and increased oil recovery of the deposit.

1 dwg

FIELD: oil and gas industry.

SUBSTANCE: method comprises run in the production well of the pipes string with filter below liquid level in well, product recovery from top deposit, oil and water separation in the wellbore, water injection to bottom deposit, oil lifting to surface. The filter is pipe in pipe, the internal pipe has hydrophilic surface with hydrophilic degree 99% min, capillary holes with diameter 2 mm min, and density 50 holes/m min. Outside pipe has hydrophobic surface with hydrophilic degree 99% min, capillary holes with diameter 2 mm max, and density 50 holes/m min. Pipes string diameter used for filter run is equal to diameter on internal filter pipe. Internal pipe has length exceeding length of outside pipe. Outside pipe is located not below the top deposit, and internal pipe - not below bottom deposit. Between the casing string and bottom of the outside pipe above the top deposit the parker is installed, ensuring fluid from top deposit ingress directly in space between the internal and outside pipes of the filter. Between the casing string and bottom of the internal pipe above the bottom deposit the parker is installed also, excluding fluid from bottom deposit ingress in space between the internal and outside pipes of the filter. Moving from top production deposit to the wellbore the fluid enters the space between the internal and outside pipes of the filter, where it is filtered via the capillary holes of the appropriate filter pipes with hydrophobic and hydrophilic coatings, separating to oil that entering in the outside pipe and then in annulus by the pump is lifted to surface, and to water that entering in the internal pipe by the pump is pumped in the bottom deposit.

EFFECT: increased efficiency of oil and water separation in the wellbore, increased efficiency of waterflooding and increased oil recovery of the deposit.

2 dwg

FIELD: oil and gas industry.

SUBSTANCE: system includes a group pumping station with a pump feeding water line with a pressure sensor, a water discharge line of the pump, a valve manifold, a system of distributing water lines downstream the pump with flow meters, shut-off and control valves, low-permeable injectors with return valves and high-permeable injectors. At that the system operates in a cyclic mode with cycles of pressure increase and decrease in the feeding water line. The high-permeable injectors are equipped with spring-operated flow controllers. At the water line feeding the pump there is a pressure controller bound with a bypass line with a flow controller and automatic gate. This gate is coupled functionally with a cluster controller. It ensures the collection of data from the flow meters and pressure sensor with the analysis of the performed task against pressure injected through the distributing water lines. The automatic gate is made so that at the r signal of the controller it provides the water flow through the bypass line in order to compensate water injection to the low-permeable injectors at the total deficiency in the injection volume to them.

EFFECT: excluding deficiency in the injection volume to the low-permeable injectors and pressure balancing in feeding water lines.

1 dwg, 1 tbl

FIELD: oil and gas industry.

SUBSTANCE: reservoir pressure maintenance system includes a water supply source, pumps, low-pressure water lines connecting the pump of the water supply source to booster pumps of injectors, which wellheads are equipped with shut-off and regulating valves. At that the low-pressure water lines are under maximum permissible pressure that exceeds the maximum permissible pressure at the input of the respective booster pump; the lines are equipped with pressure regulators. These pressure regulators ensure reduction of pressure at the input of the respective booster pump in the operation process up to a value lower that the maximum permissible pressure but not lower that the minimum permissible pressure for this pump. The pressure regulators are operating as downstream pressure controllers during limitation of the injection volume to one or several injectors or during their complete shut-down. The booster pump is designed for the input pressure as per the following formula.

EFFECT: improved reliability of the pumps operation and increase of their life between overhauls.

1 tbl, 1 dwg

FIELD: oil and gas industry.

SUBSTANCE: according to the method a deposit is drilled out by wells as per the wide well spacing pattern. Deposits are surveyed with the determination of their hypsometric depths. New wells are constructed and offshoots or horizontal offshoots are drilled from the existing wells towards the maximum oil saturation of the deposit. At that a seismic survey is performed with the determination of several oil-saturated zones in the deposit with advanced permeability and porosity both in the square area and altitude of the reservoir. Availability and position of fault lines is defined additionally. New horizontal or inclined wells are constructed as per an irregular pattern so that horizontal or inclined section of these wells passes through the selected oil-saturated zone with the maximum filtering area. Construction of offshoots or horizontal offshoots from the existing wells is made towards the closest oil-saturated zone so that they pass the maximum filtering area upon drowning of the wells or reduction of the oil flow rate below the profitable value. The offshoots or horizontal offshoots pass through the zone with the effective oil-saturated thickness of at least 10 m when water-bearing reservoirs are available in the stratum foot, or at least 4 m when the water-bearing reservoirs are not available in the stratum foot. The inclined offshoots or horizontal offshoots pass through the oil-saturated zone perpendicular or at an acute angle towards the deposit fault line at the distance that allows the prevention of fast drowning of the extracted product.

EFFECT: higher efficiency of development for a less explored oil deposit.

2 cl, 1 ex, 1 dwg

FIELD: oil and gas industry.

SUBSTANCE: system of cluster water injection to reservoir contains the cluster pump station, block-regulating valves, pump, line for water supply to pump, water flowline connecting pump and manifold, system of distributing water lines with branches to each injection to high, medium and low intake wells. Branches of medium intake wells are equipped with calibrated unions. The cluster pump station ensures the cyclic operation mode with periodic pressure increasing or decreasing in the supply water line. The supply water line is equipped with pressure regulator to reduce or to increase pressure at pump inlet if appropriate pressure exceeds or reduces below the pressure set-point in the supply water line. The pressure set-point is pre-selected based on the pump characteristic. Additionally the pump is equipped with the variable frequency drive. The water flowline is equipped with the pressure transmitter connected with pump VFD to maintain pre pre-selected optimal pressure by the pump in the water flowline. At that branches of the high intake wells are equipped with the appropriate flow regulators to ensure permanent volume of water injection.

EFFECT: minimisation of water overinjection to the injection wells of same intake, and exclusion of water underinjection to the injection wells of other intake upon optimisation of the power consumption for water injection in the system of cluster water injection to the reservoir, and pressure stabilisation in water lines.

1 dwg, 2 tbl, 2 ex

FIELD: oil and gas industry.

SUBSTANCE: on a gas-oil deposit containing gas formations with an oil bank containing high-viscosity oil there drilled strictly under each other are horizontal wells. Some part of wells is located above an oil-gas contact zone, and the other portion is located under an oil-gas contact zone. Water is injected to upper horizontal wells, which is lowered in the formation under action of gravity forces down to an oil bank zone. After that, a pause is maintained, during which a provision is made for contact of the pumped water to oil with formation of an oil-water emulsion having increased viscosity, and increase of viscosity on an oil-gas contact reduces conductivity of the system in a vertical plane. Due to this, reliable isolation of the oil bank from a gas cap is achieved in vicinity of the wells being considered. Then, to the same upper wells there pumped is a hydrophobic liquid - it is lowered downwards as well, and being distributed in the formation volume, it creates one more layer above an oil-water emulsion, which prevents movement of this emulsion in an upward direction - to a gas part of the formation. Therefore, pumping of the hydrophobic liquid allows creating a zone non-permeable for the oil-water emulsion, and the latter in its turn prevents penetration of oil into the gas cap. After that, operation of the gas cap through upper wells and that of the oil bank through the lower ones is started.

EFFECT: improving oil production efficiency due to independent parallel sampling of the product of a productive formation, avoiding breakthrough of gas into oil-producing wells and vice versa oil to gas-producing wells.

3 cl, 4 dwg

FIELD: oil and gas industry.

SUBSTANCE: method is applied to deposits developed by producers and injectors. During implementation of the method producers are transferred to other deposits, producers are shut down for the period of pumping and "relaxation" of the deposit, at that values of gas factor and water cut are monitored permanently. These actions allow speeding up of the process of formation pressure recovery in absence of extraction that reduced formation pressure. The shut down producers are input into operation as the formation pressure is restored up to the level covering the value of hysteresis for gas resolution against pressure, at that periodical start-up of wells is made for on-line testing of the production yield, water cut and value of gas factor. Thereafter project producers are drilled.

EFFECT: increased yield of wells by increased oil mobility due to solution of gas evolved from oil in the rock at recovery of formation pressure.

2 dwg

FIELD: oil and gas production.

SUBSTANCE: groups of high intake- and low intake-capacity injecting wells are chosen in a single hydrodynamic system and, for each well, oil reservoir properties and permissible degree of pollution of fluid received by high intake-capacity wells are determined. When fluid from low-permeable oil reservoir flows off through high intake-capacity wells, this fluid is cleaned to permissible degree of pollution.

EFFECT: reduced losses in intake capacity of formations and increased time between treatments of wells.

1 dwg

Up!