RU102056U1 - SYSTEM FOR SUPPORTING PLASTIC PRESSURE WHEN DEVELOPING OIL DEPOSITS - Google Patents

Abstract

 1. A system for maintaining reservoir pressure - PDD in the development of oil fields, including a wellbore and a water discharge device on a wellbore, connected by a water conduit of a pressure maintenance system to an injection well, characterized in that a cluster water discharge unit with the ability to control the amount of discharged water, the PPD system is configured to increase the pressure of the discharged water by controlling the amount of discharged water and / or installed on the water conduit to sucking. ! 2. The reservoir pressure maintenance system according to claim 1, characterized in that it is configured to direct the discharged water into one or more injection wells. ! 3. The reservoir pressure maintenance system according to claim 1, characterized in that it is configured to direct the discharged water into that injection well, which will ensure its injection into the reservoir from which it was extracted. ! 4. The system for maintaining reservoir pressure according to claim 1, characterized in that it is configured to provide the amount of water discharged at the cluster water discharge installation not exceeding the injectivity of the injection well intended for injection. ! 5. The reservoir pressure maintenance system according to claim 1, characterized in that it is configured to direct the discharged water into the injection well closest to the cluster water discharge installation. ! 6. The reservoir pressure maintenance system according to claim 1, characterized in that the cluster water discharge installation is configured to organize optimal water discharge, for example, depending on the amount extracted

Description

The inventive utility model relates to the field of oil production and can be used in systems for maintaining reservoir pressure (RPM) in the development of oil fields, especially in the late stages of development, when the production of oil wells is characterized by high water cut.

A well-known system of maintaining reservoir pressure in the development of oil fields is widely known, providing for the operation of a cluster pump station (SPS) in a constant mode, determined by the pressure necessary to pump water into the least torpedo injection wells of the field, while the distribution of flows through other wells is carried out by throttling at the inlet of flows into injection wells during their constant operation, and coordination of network characteristics (set of pressure waters and rows of injection wells) and CND pumps in cases where the characteristics intersect outside the working area of the latter, is performed by throttling the flow at the outlet KNU / Norms technological design collection, transportation, treatment of oil, gas and oil field water. MNP, 1985 /.

A disadvantage of the known system is the lack of effectiveness due to the following:

- a large amount of unnecessary pumping and, accordingly, high energy costs - the well products produced at different bushes of the field are mixed and fed to the preliminary water discharge unit (UPVS) or the oil treatment workshop (TsPN), where part of the water is discharged, then the discharged water through high-pressure water pipelines pressure is returned back to the field for injection into the reservoir, and the “shoulder” of the pumping can be up to 50 km or more;

- a significant residence time of water on the surface (as part of well production and discharged water) leads to intensification of corrosion and scaling due to reaction with oxygen and due to cooling;

water extracted from different strata enters the SPS it is almost impossible to ensure the injection of “native” water into the reservoir;

- energy losses during throttling of flows in wells and at oil pump stations;

- the operation of centrifugal pumps in areas of performance with reduced values of efficiency;

- the lack of the ability to organize complex maneuvering effects on the formation, and, as a result, a high level of energy loss, low controllability of the system and the lack of the possibility of optimizing its operation modes.

The closest in technical essence and the achieved result to the claimed utility model is a system for maintaining reservoir pressure in the development of oil fields, including, in addition to injection wells and a conduit of the pressure maintenance system, - a well for discharging water on a well cluster - for supplying discharged water to the water pipe of the pressure maintenance system / Shayakberov V.F., Ismagilov PP, Latypov I.A. New technologies for modernizing the arrangement of old oil fields // Scientific and Technical Bulletin of Rosneft Oil Company. - 2010. - No. 1. - S.8-11 /. The PPM system of the prototype involves the use, directly on the bush, as a device for the early discharge of water - a well that has gone out of service.

The PPD system of the prototype is not effective enough, because:

- the “shoulder” of pumping the discharged water from the well for discharging water into the conduit of the RPM system can be significant distances (depending on the distance of the well that has gone out of operation), which increases the volume of pumping, energy consumption and the risks of corrosion and scaling;

- in the well for water discharge (not suitable for full discharge) only a small part of the water is discharged, namely: only free water, since the production of wells with an unbroken oil-water emulsion arrives at the inlet of the well for water discharge;

- in the RPM system according to the prototype, increasing the pressure of the discharged water is possible only by installing a pump on the water conduit, since the amount of water discharged at the well, which is not suitable for a full discharge, is practically not regulated.

The problem to be solved is to increase the efficiency of the reservoir pressure maintenance system during the development of oil fields by ensuring full early discharge of water on the wellbore. A full early discharge of water is provided, in turn, by the construction directly on the wellbore of a full-fledged water discharge installation that meets regulatory requirements, for example, RD 39-004-90. A full early discharge of water at the wellbore reduces the energy consumption for pumping water into the water duct of the PPD system and the risks of corrosion and scaling, since the cluster water discharge installation can be located on the bush with a minimum “shoulder” of pumping the discharged water into the water pipe of the PPD system and, in addition to Moreover, it provides a more complete - high-quality - dehydration of well products, which reduces, accordingly, the risks of corrosion and salt deposition. The parameters of the installation of a water discharge, for example, bush (installed on a bush) - are adjustable; including the amount of discharged water, which allows you to control the pressure of the discharged water in the inventive system of pressure maintenance.

The problem is solved in that in a system for maintaining reservoir pressure during the development of oil fields, including a wellbore and a device for discharging water on a wellbore, connected by a water conduit to the injection system with an injection well, a cluster unit for discharging water from a wellbore is used as a water discharge device controlled by the amount of discharged water, the reservoir pressure maintenance system is configured to increase the pressure of the discharged water by controlling the amount of discharged water and / or Formation water line to the pump. The reservoir pressure maintenance system is configured to direct discharged water to one or more injection wells. The reservoir pressure maintenance system is configured to direct the discharged water into that injection well, which will ensure its injection into the reservoir from which it was extracted. The reservoir pressure maintenance system is configured to provide the amount of water discharged at the water discharge cluster unit, not exceeding the injectivity of the injection well into which it is pumped. The reservoir pressure maintenance system is configured to direct the discharged water into the injection well closest to the cluster water discharge installation. The water discharge bush is designed to organize optimal water discharge, for example, depending on the amount of oil produced and the cost of its production and pumping. The mode of operation of the cluster installation of water discharge is established depending on the total flow rate of the well cluster, controlled by downhole metering devices for the flow of oil, water and gas. The productivity of the cluster installation of water discharge is not less than the maximum total flow rate of the well cluster on which it is located.

Water discharge installations from oil well products (the so-called UPSW - preliminary water discharge installations) are well known; for example, from / Development and exploitation of oil and gas fields. Muravyov I.M. and others. 3rd edition, revised and supplemented. - M .: Nedra Publishing House, 1970. - P.345 / and involve the collection of well products at the distribution unit, the separation of the oil and gas mixture into oil gas, oil and water in an oil field separator and the subsequent removal of oil gas, oil and water (water discharge ) Water discharge installations must comply, for example, RD 39-004-90 / Guidelines for the design and operation of separation units of oil fields, the selection and layout of separation equipment, - Ufa, VNIISPTneft, 1990. - P.31-44 /.

The production at each cluster of oil wells, conventional or enlarged, of the discharge of part of the water from the production of wells by means of a cluster installation of water discharge, moreover, the discharged water is directed to one or more injection wells, which improves efficiency by reducing the volume of pumping; accordingly, the energy consumption for pumping water into the conduit of the PPD system and the risks of corrosion and scaling are reduced. The operation parameters of the cluster water discharge installation are adjustable; including the amount of discharged water, which allows you to control the pressure of the discharged water in the inventive system of pressure maintenance.

The production, if necessary, of increasing the pressure of the discharged water to a level that ensures the injection of water into the reservoir, creates the conditions necessary for its injection, which ensures an increase in the efficiency of the RPM system. The control of the pressure of the discharged water by regulating the amount of water discharged at the cluster installation and / or the water pressure at the inlet of the injection well allows for differentiated injection depending on the geological conditions of the field, which improves the efficiency of the pressure maintenance system. The direction of the discharge water discharged at the cluster installation for injection into that injection well, which will ensure its injection into the reservoir from which it was extracted, allows to increase the efficiency of the RPM system due to the fact that the “native” is pumped into the formation (lifted from it) water. When the amount of water discharged at the cluster installation does not exceed the injectivity of the injection well, an increase in the efficiency of the RPM system is ensured due to the absence of the problem of utilization of "excess" water. The direction of the water discharge discharged at the cluster installation to the injection well closest to it leads to a decrease in the length of water conduits, which contributes to an increase in the efficiency of the RPM system. The determination of the amount of water for each cluster water discharge unit that is optimally discharged on it, for example, depending on the amount of oil produced and the costs of its extraction and pumping, allows optimizing the operation of the cluster water discharge unit and increasing the efficiency of the RPM system. The production of reliable borehole metering of the flow rate by the amount of oil, water and gas produced, as well as setting the operating mode of the cluster water discharge unit depending on the total flow rate of the well cluster, allows optimizing the operation of the cluster water discharge installation and increasing the efficiency of the pressure maintenance system. The choice of liquid productivity of a cluster unit for water discharge is not less than the maximum total flow rate of a well cluster allows for the discharge of part of the water from all crude oil produced on a cluster of wells, which ensures an increase in the efficiency of the cluster and the pressure maintenance system.

The system for maintaining reservoir pressure is as follows.

1. Stand out bush (group) of oil wells.

2. The well production rate is determined (by the amount of crude oil and gas extracted from the subsoil), as well as the water cut of the oil.

3. The operating parameters of the wellbore product on the surface are determined, for example, the working pressure and temperature of the product.

4. Selected reagents, demulsifiers for the destruction of the emulsion, as well as their concentration.

5. Requirements for discharged water are set for the content of residual oil products and mechanical impurities according to the geological conditions of the formation into which it is planned to be injected.

6. Depending on the quantities of oil and gas, as well as their temperature and pressure, the minimum diameter of the pipeline is calculated at which additional dispersion of the emulsion is prevented (at the maximum permissible speed of the mixture of oil and gas).

7. An injection well is selected for a wellbore intended for injection of water discharged thereon.

8. The injectivity of the injection well is determined depending on the water injection pressure.

9. A cluster water discharge installation is being built, connected by a water conduit to an injection well.

10. The production of well wells is being collected.

11. The selected demulsifier reagent with a concentration ensuring the destruction of the crude oil into oil and water is supplied to the crude oil.

12. The supply of well cluster products to the cluster water discharge installation begins, in which it is divided into partially dehydrated oil, gas and discharged water.

13. Partially dehydrated oil and gas are discharged from the cluster water discharge unit through one or different pipelines.

14. The amount of partially dehydrated oil and its water cut at the outlet of the cluster water discharge unit is measured.

15. The amount of gas is measured at the outlet of the cluster water discharge unit.

16. The water discharged in the cluster discharge plant enters the water conduit connecting the cluster discharge plant to the injection well.

17. The concentration of residual oil products and solids in the discharged water is measured.

18. A comparison is made of the concentration of residual oil products and mechanical impurities in the discharged water with the given reservoir geological conditions.

19. If the discharged water does not satisfy the quality of the geological conditions of the formation, then the amount of water discharged at the cluster installation is reduced and the work is repeated according to items 12-18.

20. If the quality of the discharged water in terms of the concentration of residual oil products and mechanical impurities satisfies the geological conditions of the formation, then the discharged water is directed to the water conduit and through it to the injection well.

21. The discharge rate of the discharged water in the water conduit is measured.

22. The pressure of water in the water conduit, for example, by a pump, is increased to a value that ensures its injection into the reservoir.

23. The water entering the conduit is pumped into the injection well.

Additionally, one or more of the following operations may also be performed.

24. As the injection well, one is selected that provides the injection of discharged water into the reservoir from which it was extracted.

25. The amount of water discharged at the cluster installation is compared with the injectivity of the injection well, and the water is discharged in an amount not exceeding the injectivity of the injection well.

26. The water discharged at the cluster discharge unit is directed through the water conduit to the nearest injection well.

27. For a cluster water discharge plant, the amount of water that is optimally discharged on it is determined, for example, depending on the amount of oil produced and the cost of its production and pumping.

28. Reliable borehole flow metering is performed based on the amount of oil, water and gas produced, and the mode of operation of the water discharge cluster installation is established depending on the total flow rate of the well cluster.

29. The liquid productivity of a cluster unit for water discharge is selected not less than the maximum total flow rate of a well cluster.

Thus, a full-fledged - with the help of a cluster water discharge installation - early discharge of water on a wellbore reduces the energy consumption for pumping water into the conduit of the pressure maintenance system and the risks of corrosion and scaling and allows you to control the pressure of the discharged water in the pressure maintenance system.

Claims (8)

1. A system for maintaining reservoir pressure - PDD in the development of oil fields, including a wellbore and a water discharge device on a wellbore, connected by a water conduit of a pressure maintenance system to an injection well, characterized in that a cluster water discharge unit with the ability to control the amount of discharged water, the PPD system is configured to increase the pressure of the discharged water by controlling the amount of discharged water and / or installed on the water conduit to sucking. 2. The reservoir pressure maintenance system according to claim 1, characterized in that it is configured to direct the discharged water into one or more injection wells. 3. The reservoir pressure maintenance system according to claim 1, characterized in that it is configured to direct the discharged water into that injection well, which will ensure its injection into the reservoir from which it was extracted. 4. The system for maintaining reservoir pressure according to claim 1, characterized in that it is configured to provide the amount of water discharged at the cluster water discharge installation, not exceeding the injectivity of the injection well intended for injection. 5. The reservoir pressure maintenance system according to claim 1, characterized in that it is configured to direct the discharged water into the injection well closest to the cluster water discharge installation. 6. The reservoir pressure maintenance system according to claim 1, characterized in that the cluster water discharge installation is configured to organize optimal water discharge, for example, depending on the amount of oil produced and the cost of its production and pumping. 7. The reservoir pressure maintenance system according to claim 1, characterized in that the mode of operation of the cluster water discharge installation is set depending on the total flow rate of the wellbore with the ability to control downhole metering devices for oil, water and gas flow rates. 8. The reservoir pressure maintenance system according to claim 1, characterized in that the productivity of the cluster water discharge installation is not less than the maximum total flow rate of the wellbore on which it is located.