Control method for production and actions system at wells cluster

FIELD: oil and gas industry.

SUBSTANCE: method provides for use of the production wells. One or several wells are equipped with pump unit with possibility of discharge change. For each production well the deposit or deposits used for production are known. At wellhead of each production well the produced crude oil and oil gas are measured, as well as crude oil watercut is determined. The product wells product is delivered to the gathering header of the wells cluster. The cluster contains one or more injection wells. For each injection well the deposit or deposits used for injection are known. Injectability of the injected water and required injection pressure are determined. Compatibility of the injected water and produced water is studied. Injection is performed upon compatibility of the injected and produced waters. Coordinates of all production and injection wells of the cluster using the same deposits are determined. For each production well time of the produced product lifting is determined from suction of the pump unit to wellhead at maximum discharge. Volume of produced crude oil and oil gas is measured with interval not exceeding half of measured time of fluid lifting for the given well. At wellhead of each well the injected water pressure and its volume are measured. Injected water volume and wellhead pressure are measured with interval not exceeding half of measured time of water supply to the wellhead of each injection well before parker. For each injection well the curve of injected water pressure and volume vs. time is plotted. For each production well using the plotted volume of produced crude oil and oil gas vs. time the relationship with the injected water volume and wellhead pressure is determined, as well as distances to each injection well ensuring injection to the same deposit. For the production wells equipped with pump units with possibility of discharge change such relationships are determined at different discharge. The wells cluster is controlled based on the obtained relationships for all production wells. At that the treated water supply system for injection is made with possibility to change water volume and wellhead pressure for one or more injection wells.

EFFECT: increased efficiency of clusters well control.

2 cl, 1 dwg

 

The invention relates to the field of oil and can be used in systems of production and gathering of oil and gas in the development of oil fields, especially in later stages of development, when production of oil wells characterized by high water cut.

Known way to control the system selection and impacts on the Bush wells containing producing wells, among which one or more equipped with a pumping unit with adjustable-frequency power to the motor in which the control parameters of the extraction process, performed on the basis of control data of geological-technical measures for the impact on the reservoir to increase fluid flow, wherein the stimulation is performed in the process of extraction by variation in geological and technical activities of the parameters of the mining process and the continuous monitoring of these parameters, including in automatic mode, as parameters of the mining process to choose the most significant for increasing the inflow: the borehole fluid pressure, temperature, humidity and the density of the fluid that capture the dynamics of changes in these parameters depending on the rotational speed of the electric motor, wherein the above-mentioned process parameters of extraction and the amount of fluid flow set up through the control unit �and maintaining an optimum value by varying the rotational speed of the electric motor, the end time of geological-technical measures determined by the time of optimizing the process parameters of extraction and magnitude of fluid flow, and for possible effects of the process parameters of production on the reservoir supply system and a suction system of a mine pump sealcoat lower and upper holes in the column of pump-compressor pipes and separated from the zone of the formation packer /Patent RF №2188934, E21B 43/12, E21B 47/06, publ.: 10.09.2002/.

The disadvantage of this method is the lack of efficiency in the operation of wells with electric submersible pumps (ESP) as electrical submersible pump hesitancy makes an error in the readings of the sensors of the controlled parameters, besides cluttering the site of perforation; the setting up of the well during maximum inflow from the reservoir (not coinciding with the optimal flow on geological conditions of the reservoir) will lead to the absorption of fluid from the dynamic level of the pump and, consequently, to an emergency stop; the method is complicated due to the large number of monitored parameters and not sufficiently reliable in high-temperature reservoirs because of chip sensors operating at temperatures below 90°C. a Systematic, but not constant, and therefore difficult to take into account the error control parameters makes the lack of a liquid degassing, p�the parameters which control the prototype.

Known way to control the system selection and impacts on the Bush wells containing producing wells, among which one or more equipped with a pumping unit with a frequency-controlled motor power supply, the output of each producing well shall be measured the number of extracted crude oil and gas as well as water cut crude oil production producing wells is directed to a system for collecting oil fields, including the pump and changing the frequency of the supply voltage of the electric motor depending on the water content of the produced well fluid, characterized in that the launch of launched pump-compressor pipes (tubing) electric centrifugal pump produces a minimum frequency of the supply voltage and thus on the minimum flow, expected flow of fluid to the reception of the measuring device on the surface, where to measure its water content, increase the frequency of the supply voltage and measure the current water content of the incoming fluid, compare the resulting value with the current watering by watering with minimal filing, if the value of the current water content of greater than or equal to the water content at the minimum flow, then continue increasing the frequency of the supply voltage as long as the value of the current VBOs�znanosti become less than the water content at the minimum flow, in the latter case, begin to reduce the frequency of the supply voltage until, until the current watering will not become greater than or equal to the water content at the minimum flow; if the current value of water content obtained with the increased flow, less the water content at the minimum flow, then begin to reduce the frequency of the supply voltage until, until the current watering will not become greater than or equal to the water content at the minimum flow /Patent RF №2421605, IPC E21B 43/12 (publ.: 20.06.2011).

The disadvantage of this method is the lack of efficiency, since the management does not take into account the amount injected into an injection well water and its pressure on the mouth, fully taken into account the effect of the injected water in the reservoir for extraction of crude oil and petroleum gas from this reservoir.

Closest to the claimed combination of essential features is the method of controlling the system selections and impacts on the Bush wells containing producing wells, among which one or more equipped with a pumping unit with the ability to change the filing, each producing well known to the reservoir or reservoirs, of which there is fishing, at the mouth of each producing well shall be measured the number of extracted crude oil and gas as well as water cut of crude oil, producing products with�vazhin goes into a collecting reservoir Bush wells, the Bush contains one or more injection wells, each injection well is known to the stratum or strata in which the pumping, throttle response on the injected water and the required pumping pressure, we investigate the compatibility of injected fluids with formation water, injection is carried out with the compatibility of injected and formation waters, the Bush contains supply system treated water for injection /Technology cluster of the dumping and disposal of produced waters. / V. F. Akberov, R. V. Miroshnichenko [et al.] / / Equipment and technologies for oil and gas industry. - M., 2013. - No. 1. - P. 55-58/.

Prototype method is not effective enough, since the management does not take into account the amount injected into each injection well water and its pressure on the mouth, fully taken into account the effect of the injected water in the reservoir for extraction of crude oil and petroleum gas from this reservoir.

Task and the expected technical result lies in improving the efficiency of operation of the system selections and impacts on the Bush wells.

The problem is solved in that in the method of controlling the system selections and impacts on the Bush wells containing producing wells, among which one or more equipped with a pumping unit with the ability to change the filing, each producing well�s known layer or layers, of which are being mined, at the mouth of each producing well shall be measured the number of extracted crude oil and gas as well as water cut crude oil production producing wells goes into a collecting reservoir Bush wells, Bush contains one or more injection wells, each injection well is known to the stratum or strata in which the pumping, throttle response on the injected water and the required pumping pressure, we investigate the compatibility of injected fluids with formation water, injection is carried out with the compatibility of injected and formation waters, the Bush contains supply system treated water for injection, according to the invention are defined by the coordinates of all production and injection wells of the Bush, are the distances between the producing and injection wells, leading respectively production and fix some seams, for each producing well measure the lift well production from intake pumping plants to the wellhead at maximum flow, the metering of the quantities of crude oil and petroleum gas and the water content of crude oil is produced at intervals of not more than half of the measured rise time of the fluid for a given well, for each producing well is restored you can change the quantities of the extracted raw not�ti oil and gas in time at the mouth of each injection well is measured the pressure of the injected water and its quantity, is the time from the arrival of water at the mouth of each injection well to the packer, the measurement of the quantity of injected water and pressure at the mouth is produced at intervals of not more than half of the measured time of occurrence of water at the mouth of each injection well to the packer, for each injection well is restored to the change in the amount of injected water and its pressure on the mouth in time, for each producing well restored by changes in time of the quantities of crude oil and petroleum gas is determined in dependence on the quantity of injected water, and the pressure on the mouth, and the distance for each of the injection wells, a leading injection in the reservoir to production wells equipped with pumps with the possibility of changes in supply, such dependencies are determined at different feed rates, based on the obtained dependencies of all producing wells is the management of the Bush wells. In addition, in some cases, the operation of the system selections and impacts on the Bush wells supply system treated water for injection can be performed with the possibility of changing the amount of supplied water and pressure at the mouth for one and�or more injection wells.

The possibility of changes in supply pumping plants producing well can be achieved by varying the frequency of the supply voltage of the ESP motor using a variable frequency drive, frequency fluctuations of the pumping unit or the stroke of the plunger sucker rod pump.

Depending on the internal structure of the injection well instead of the time from the arrival of water at the mouth of each injection well until the packer may be selected, for example, the time of fill water section of the wellbore in the zone of perforation.

In the supply system treated water for injection water can enter from the shops of the oil, the preliminary sewage disposal plants, water wells, and lakes and rivers /Technology pre-spray of the water discharge with the use of decommissioned wells. / V. F. Akberov, Latypov I. A. [and others]. // Scientific and technical Bulletin of OJSC "NK Rosneft". - M., 2011. - No. 3. - P. 36-37./.

Determination of the coordinates of all production and injection wells of a Bush helps to clarify the interaction between the crude oil and gas and water injection into the reservoir that provides increased efficiency.

Finding distances between mining and discharge, leading respectively production and fix some of the layers, allows to specify inter�actvie between crude oil and associated gas, and water injection into the reservoir, that provides increased efficiency.

A well-known theorem of Kotelnikov - Nyquist - Whittaker - Shannon or simply the sampling theorem the sampling theorem), considered one of the most important results of information theory, has a fairly simple formulation: if the analog signal does not contain in its spectrum of frequencies higher than Fmaxit can perfectly recover on discrete samples taken with a frequency strictly greater 2*Fmax.

Metering for each producing well rise time well production from intake pumping plants to the wellhead at the maximum flow allows you to define the highest frequency for this well, which provides increased efficiency.

Production in each producing well measurements of the quantities of crude oil and petroleum gas and the water content of crude oil at intervals of not more than half of the measured rise time of the liquid for this well allows discrete samples, taken strictly, with a frequency strictly greater double the highest frequency that provides the performance /Installation for measuring the amount of oil and gas wells and their Bush / VF Chakarov // Measurement techniques. M.: Publisher IPC standards. 2011. No. 11. P. 26-30. Test units for measurements of the quantity of petroleum and petroleum gas forwells and well clusters / V. F. Shayakberov // Measurement Technique. USA: 2012. Vol.54. No. 11. February. Pp.1249-1255./.

Fast and accurate determination of water content of crude oil is carried out using the measuring pipe installation / Patent RF №2342528 IPC E21B 47/10, E21B 43/38; publ. 27.12.2008. The error in the calculation of water content when using pipe installation to measure the quantity of crude petroleum and gas / V. F. Akberov // Measurement techniques. 2013. No. 2. Pp. 25-26. Error in calculation of degree of flooding with the use of a pipe device for mearsurements of the quantity of crude oil and gas / V. F. Shayakberov // Measurent Technique. USA: 2013. Vol.56. No. 2. P. 146-148./.

Recovery perfectly accurate discrete samples according to theorem of Kotelnikov-Nyquist-Whittaker-Shannon for each producing well change the quantities of extracted crude oil and gas and the water content of crude oil in time improves the efficiency.

Measurements made at the mouth of each injection well, the injected water pressure and volume to determine the number injected into each layer of water that provides increased efficiency.

Finding the time from the arrival of water at the mouth of each injection well until the packer allows to determine the highest frequency for this well, which provides increased efficiency.

The production of measurements of the quantity of injected water and pressure at the mouth is produced at intervals not greater� than half of the measured time of occurrence of water at the mouth of each injection well until the packer allows discrete samples, taken strictly, with a frequency strictly greater double the highest frequency that provides increased efficiency.

Recovery perfectly accurate discrete samples according to theorem of Kotelnikov-Nyquist-Whittaker-Shannon for each injection well change the amount of injected water and its pressure on the mouth in time improves the efficiency.

The definition for each producing well restored by changes in time of the quantities of crude oil and petroleum gas depending on the amount of injected water and the pressure on the mouth, and the distance for each of the injection wells, leading the fix in the same layer, can improve the efficiency.

The definition of such dependencies at different feed rates for production wells equipped with pumps with the ability to change the feed, improves the efficiency.

The Bush management of the wells on the basis of the obtained dependences for all producing wells improves the efficiency due to more accurate accounting of the mutual influence of crude oil and associated gas and water injection.

The execution of the supply system treated water for injection with the ability to change the amount of water supplied and the pressure at the mouth for one or more injection wells allows you to quickl� a more accurate account of the mutual influence of crude oil and associated gas and water injection, that provides increased efficiency.

The execution of the supply system treated water for injection with the ability to change the amount of water supplied and the pressure at the mouth for one or more injection wells may when the water pressure sufficient for injection into the reservoir, creates a device to create water pressure. As a device for creating pressure water can be used, for example, the pump-"flip horizontal pump installation or pit with ESP. Change the water in the device to create a pressure is provided, for example, by changing supply frequency of the motor the VFD, the change of hydraulic resistance, the direction of the water in other injection well or conduit.

The claimed method of controlling the sampling of, and influences on the Bush of the oil wells is carried out by the following sequence of operations:

1) allocation contained on the Bush producing wells;

2) to list the pumping plants, among which one or more must have the ability to change feed (for ESP is provided by equipping the VFD; for sucker rod pumps - a change in the oscillation frequency of the pump Jack pump Jack or stroke);

3) determining, for each extractive SC�Ainy layer or layers, of which is the extraction (by the well);

4) measurements made at the mouth of each producing well quantities of extracted crude oil and gas as well as water cut of crude oil;

5) the direction of the production wells into a collecting reservoir Bush of wells;

6) allocation contained in the Bush of injection wells;

7) determining for each injection well layer or layers, in which the pumping (on the well);

8) measurement pickup by the injected water and the required pressure of injection for each injection well;

9) study the compatibility of injected fluids with formation water;

10) implementation of injection in compatibility of injected and formation waters from the supply system treated water for injection;

11) determination of the coordinates of all production and injection wells of the Bush;

12) finding distances between producing and injection wells of the Bush, leading respectively production and fix some of the seams;

13) measurement for each producing well rise time well production from intake pumping plants to the wellhead at maximum flow;

14) production of measurements of the quantities of crude oil and petroleum gas and the water content of crude oil at intervals of not more than half of the measured BP�menny lift the fluid to the wellbore;

15) recovery for each producing well change the quantities of extracted crude oil and gas with the changes of water content in time;

16) measured at the mouth of each injection well pressure of the injected water and its quantity;

17) finding time from receipt of water at the mouth of each injection well until the packer (the variant when entering injection well water moves in it by the column of pump-compressor pipes and passes through the packer, the lower packer, the water occupies the entire column);

18) production of measurements of quantities of injected water and pressure at the mouth at intervals of not more than half of the measured time of occurrence of water at the mouth of each injection well until the packer;

19) recovery for each injection well change the amount of injected water and its pressure on the mouth in time;

(20) the definition for each producing well restored by changes in time of the quantities of crude oil and petroleum gas depending on the amount of injected water and the pressure on the mouth, and the distance for each of the injection wells, a leading injection into the same aquifer;

21) the definition of wells equipped with pumping units with the possibility of changes in supply, such dependencies p�and different feeds;

22) management on the basis of the obtained dependences for all producing wells tree wells;

23) a further control is made to reflect changes in the amount of water supplied and the pressure at the mouth for one or more injection wells in cases where the delivery system is prepared water for injection is made with possibility of changing the amount of supplied water and pressure at the mouth for one or more injection wells.

Example

One possible embodiment of the device for implementing the inventive method of controlling the sampling of, and influences on the Bush of wells shown in the drawing.

The hive consists of production wells with pumps 1 and 2 and an injection well 3, which respectively produce the extraction and injection into the reservoir 4. Production wells 1 and 2, nozzles 5 and 6 are connected with collecting collector 7. The filing of a producing well with the pumping unit 1 is regulated by the device to change the flow 8. The number of extracted crude oil and gas as well as water cut of crude oil from production wells 1 and 2 are measured measuring devices 9 and 10, respectively. In an injection well 3 water for injection is supplied from conduit 11 through conduit 12. The amount of injected water and the pressure at the injection well 3 are measured froze�th water device 13. Measuring devices 9, 10 and 13 with the control device 14 have a feedback device to change the flow 8.

A device for implementing the inventive method of controlling the sampling of, and influences on the Bush wells works as follows. Coordinates is determined by the distance on the surface between the injection well 3 and the extracting wells with pumping units 1 and 2. In an injection well 3 from conduit 11 through conduit 12 is injection of water into the reservoir 4. The amount of injected water and its pressure is measured measuring device 13, from which the received information is supplied to the control device 14. Production wells with pumping units 1 and 2 perform extraction from the reservoir 4. Downhole products for the nozzles 5 and 6 is fed into a collecting reservoir 7. The amount of extracted crude oil and gas production, and water content of crude oil is measured measuring devices 9 and 10, which information is supplied to the control device 14. Frequency measurements measuring devices 9, 10 and 13 are set by the control device 14, in order to use theorem Kotelnikov-Nyquist-Whittaker-Shannon. At the same time on a producing well with the pumping unit 1, with different pitch, variable, with the device of pitch change 8, measured watering. In the control device� 14 is produced for wells with pumping units 1 and 2, the recovery of changes in the quantities of extracted crude oil and gas in time for injection wells 3 - recovery of changes in the number of injected water and its pressure over time. Then for wells with pumping units 1 and 2 and restored to changes in time of the quantities of crude oil and petroleum gas is determined dependent on the amount of injected water and pressure, as well as the distance to the injection well 3. For producing well with the pump unit 1 according to determined at different feed rates. On the basis of the obtained dependences for wells with pumping units 1 and 2 is the management of the Bush wells for the purpose, for example, the optimal crude oil production.

Thus, the claimed method of controlling the sampling of, and influences on the Bush wells more efficiently prototype by adjusting in real time of production wells and water injection with a constant response to changing conditions.

1. The operation of the system selections and impacts on the Bush wells containing producing wells, among which one or more equipped with a pumping unit with the ability to change the filing, each producing well known to the stratum or the strata of which are the prey, at the mouth of each producing well measure the amount of extracted crude oil and petroleum gas, as well as about�OneNote crude oil, the output of production wells is directed into a collecting reservoir Bush wells, Bush contains one or more injection wells, each injection well is known to the stratum or strata in which they inject, throttle response on the injected water and the required pumping pressure, examine the compatibility of injected fluids with formation water, injection is carried out at the compatibility of injected and formation waters, the Bush contains supply system treated water for injection, characterized in that determine the coordinates of all production and injection wells of the Bush, they find the distances between producing and injection wells, leading respectively production and fix some seams, for each producing well measure the lift well production from intake pumping plants to the wellhead at maximum flow, the measurement of the number of extracted crude oil and gas produced at intervals of not more than half of the measured rise time of the fluid for a given well, for each producing well to restore the change in the number of extracted crude oil and gas in time, at the mouth of each injection well measure the pressure of the injected water and its number, find time from receipt of water at the mouth of each injection well d� packer, measurement of the amount of injected water and pressure at the mouth is produced at intervals of not more than half of the measured time of occurrence of water at the mouth of each injection well to the packer, for each injection well to restore the change in the amount of injected water and its pressure on the mouth in time, for each producing well restored by changes in time of the number of extracted crude oil and gas is determined dependent on the amount of injected water and the pressure on the mouth, and the distance for each of the injection wells to injection into the same aquifer for wells equipped with pumps with the possibility of changes in supply of, such dependencies are determined at different feed rates, based on the obtained dependencies of all producing wells produce management Bush wells.

2. A method according to claim 1, characterized in that the supply system treated water for injection is made with possibility of changing the amount of supplied water and pressure at the mouth for one or more injection wells.



 

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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.

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 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

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