RU85187U1 - SYSTEM FOR THE USE OF WATERFLOWING OIL PRODUCING WELLS WHEN ORGANIZING LAYER PRESSURE MAINTENANCE ON THE INTER-WELL TRANSFER TECHNOLOGY - Google Patents

Abstract

A system for using flooded oil producing wells for organizing reservoir pressure maintenance using cross-hole pumping technology, including one or more oil producing wells, a collection pipeline, an injection well, characterized in that water-borne oil producing wells (one or several) are selected for water intake with a production rate of well products which, by calculation, is sufficient for injection into a nearby injection well in order to maintain reservoir pressure I’m in a certain area of the developed oil field, while on the pipeline for oil producing wells, a phase divider of well products is installed into three components - gas, oil, water, it is also a purifier for produced water from suspended solids, and to increase the injection pressure of produced and purified water in injection well in series, between the phase divider and injection well connected pumping unit located in a shallow pit, and the pumping unit includes one section of Azhinov submersible electric pump with the upper facing discharge side of the casing.

Description

The utility model relates to the oil industry and may find application in the production of water and oil from waterlogged wells in organizing the maintenance of reservoir pressure using the technology of cross-hole pumping (MSP-PPD).

There is a method that provides oil production as associated with the main production of water for the reservoir pressure maintenance system. The method includes the separation of fluid in the well into water and oil and separate selection of water and oil. When the water well of an oil producing well is more than 99.5%, it is transferred to the category of wells for water production in the reservoir pressure maintenance system with associated oil production. For this, the well is equipped with two columns of tubing with pumps. The first column is lowered to a depth filled with water, separated by gravity separation of oil. The second column is lowered to a depth close to the wellhead, into the oil accumulation zone, the inflow from the reservoir is maintained by the water withdrawal along the first tubing string constant from the condition of preventing the formation of clogging substances in the borehole and near-wellbore zone. In this case, the selection of oil for the second column of tubing is carried out continuously or periodically depending on the accumulated oil in the well (RF Patent No. 2297518, CL EV 43/00, publ. 2007.04.20).

The disadvantages of the known method adopted as a prototype of the claimed technical solution are:

- the complexity of the technology of water and oil production associated with the calculations and the duration of the output of the well to a certain mode of operation during oil production;

- the complexity of the design of surface wellhead equipment and the need to use a variety of non-standard underground equipment.

In addition, the second tubing string lowered to a depth close to the wellhead into the oil accumulation zone, as a rule, will be paraffinized with Devonian oil, which will entail additional material costs for dewaxing the underground equipment of the well.

The objective of the utility model is the creation of an MSP-PPD system using water-producing oil wells (one or several) located close to an injection well, with maximum purification of produced formation water from oil products, solid suspended particles (HDP) and the removal of produced gas in the immediate vicinity of the mouth water-producing oil (water) wells, with the lowest labor and operational costs, as well as environmentally friendly to the environment.

The technical result is achieved by the fact that for applying the MSP-PDD technology at a site remote from the well pump station, a water-producing oil well (one or several) is selected with a production rate of the well, the water content of which, according to the calculation, is sufficient for injection into a nearby injection well in order to maintain reservoir pressure in a specific area of the developed oil reservoir. The oil contained in the borehole production, regardless of its quantity, is selected and sent to the collection point through the existing oil pipeline. For this purpose, the production of an oil producing well on the day surface is divided into three phases — gas, oil, and water — using a “phase divider” device; it is also a purifier for produced water from HDTV.

The phase divider contains a steel tube insert of an expanded diameter, descending from the mouth of the water well, with an inclination relative to the horizontal; in the upper and lower ends of the steel pipe insert, storage chambers are installed, hermetically connected to the housing and having hydraulic communication with its internal cavity. An inlet pipe is installed in the lower part of the pipe insert and connected to the shut-off valve of the wellhead armature of an oil producing well. One of the two discharge nozzles is installed in the upper part of the upper storage chamber with a flange connection, a constriction device (fitting) and a non-return valve are installed between the flanges, and the counter flange is connected to the existing oil pipeline. The second pipe is installed in the middle part along the lower generatrix of the pipe insert and connected to the water conduit laid to the injection well. The water conduit is equipped with valves, metering unit and non-return valve. A pipe with a valve is installed at the lower point of the lower storage chamber to remove deposited HDTV and oil sludge. To increase the injection pressure of the produced and purified water into the injection well, between the water conduit connecting the phase divider and the injection well, a booster pump unit with an upper electric drive is installed, installed in a shallow (4 m) pit containing a casing with a flange seal and a discharge pipe. The flow nozzle is connected to the wellhead of the injection well, and the booster pump installation includes one section of a borehole submersible electric centrifugal pump facing the casing by the discharge side.

The productivity of the downhole pump in an oil well is selected depending on the maximum flow rate of the reservoir, but with a pressure that ensures the injection of water into the injection well, taking into account the booster pump unit connected to the water conduit.

Figure 1 shows a diagram for the use of waterlogging oil wells in the organization of RPM technology SMEs.

The system for using flooded oil producing wells for organizing reservoir pressure maintenance using cross-hole pumping technology includes a flooded oil producing well 1 (one or several) with a flow rate of well production, the water content of which is estimated to be sufficient for injection into a nearby injection well 2 in order to maintain reservoir pressure in a certain area of the developed oil reservoir. The oil contained in the borehole product, regardless of its quantity, is selected and sent to the collection point for the existing oil pipeline 14. For this, the production of an oil producing well on the surface is divided into three phases — gas, oil and water — using a “phase divider” 3 , It is also a purifier of produced water from HDTV.

The phase divider 3 contains a steel pipe insert 4 of an expanded diameter, descending from the mouth of the oil well 1, with an inclination relative to the horizontal, in the upper and lower ends of the steel pipe insert, storage chambers 5 and 6 are installed, hermetically connected to the pipe insert body 4 and having hydraulic communication with its internal cavity. An inlet pipe 7 is installed in the lower part of the tube insert 4 and connected to the slide valve 8 of the wellhead 9 of the oil well 1. One of the two discharge pipes 10 is installed in the upper part of the upper storage chamber 5 with a flange connection, a constriction device 12 is installed between the flanges (fitting) and a check valve 13, and the counter flange is connected to the existing oil pipe 14. The second pipe 11 is installed in the middle part along the lower generatrix of the pipe insert 4 and connected to the conduit 15, laid to the pump water well 2. The water conduit 15 at both ends is equipped with two identical valves 18, metering station 19 and a check valve 20. At the lower point of the lower storage chamber 6, a pipe 16 with a valve 17 is installed to remove precipitated HDTV and oil sludge. To increase the injection pressure of the produced and purified water into the injection well 2 in series between the water conduit 15 connecting the phase divider 3 and the injection well 2, a booster pump unit 21 is connected to the upper electric drive installed in a shallow (4 m) pit containing a casing 25, a flange the seal 23 and the discharge pipe 24. The discharge pipe 24 is connected to the wellhead 26 of the injection well 2, and the booster pump installation 21 includes one section of the borehole submersible electric center a reliable pump 22, facing the discharge side into the casing 25.

The system operates as follows.

When organizing the maintenance of reservoir pressure at a site remote from the cluster pumping station using the MSP-PPD system, an irrigated oil producing well 1 (one or several) is selected with a production rate of the well, the water content of which is estimated to be sufficient for injection into a nearby injection well 2 in order to maintain reservoir pressure in a specific area of the developed oil reservoir. Downhole products of an oil producing well 1 containing produced water, oil and gas raised to the surface through wellhead fittings 9, a valve 8, and through an inlet pipe 7 enters the internal cavity of an expanded diameter steel pipe insert 4 and loses linear velocity, after which in laminar mode the outflow through the inner cavity of the steel pipe insert 4 is a path separation into phases - water, oil and gas. Oil sludge and HDTV are also deposited there, which accumulate in the lower chamber 6 of the phase divider 3. The steel pipe insert 4 is descending and is at some angle to the horizon. Gas and oil, having the lowest density relative to the density of produced water, rise into the upper storage chamber 5. From the storage chamber 5, gas, oil and partially water through the pipe 10, fitting 12 and check valve 13 through the pipeline 14 are discharged to a group metering unit, then to oil and gas collection points (not shown in the diagram). One indispensable condition is that the pressure in the upper storage chamber 5 should slightly exceed the pressure in the oil line 14. The pressure difference is achieved by regulating the outflow of water into the injection well 2 by a valve 18 on the discharge pipe 11. The diameter of the constriction device (fitting) 12 is selected with taking into account the viscosity of oil produced at the same time and the pressure drop gradient in the upper storage chamber 5 and in the oil pipeline 14. Water, relatively purified from oil products and HDTV, with a minimum content of dissolved gas in it through the discharge pipe 11, the valve 18, through the water pipe 15, through the metering unit 19 and the check valve 20 gets to receive the booster pump unit 21 with the upper electric drive, located in a shallow (4 m) pit, in close proximity to the injection well 2. Water is pumped by a submersible single-section pump 22 into the casing 25 and through a discharge pipe 24 connected to the wellhead 26 to the injection well 2. The productivity and pressure of the single-section submersible electric centrifugal pump 22, they are pumped in accordance with the injectivity of injection well 2. The precipitated oil sludge and HDTV accumulated in the lower storage chamber 6 are periodically shipped through a valve 17 to a tank on a wheeled vehicle.

The application of the proposed system for the use of flooded oil production wells, while organizing the maintenance of reservoir pressure by the technology of cross-hole pumping, allows you to operate an oil production well for water and oil extraction without changing the mode of its operation oriented to oil production.

In addition, the proposed system has the following advantages:

- high mobility and controllability, which in the conditions of a developed field with constantly changing characteristics greatly improves development indicators;

- low material consumption, high manufacturability, not requiring large capital costs and a long time for the construction of facilities;

- abandonment of an extensive network of high-pressure distribution pipelines;

- a significant reduction in capital expenditures for equipment to achieve high pressures for injecting the working agent into the injection well, due to the use of a single-section submersible well pump with an upper electric drive, facing the casing in the discharge side, in a shallow (4 m) small diameter pit.

Claims (1)

A system for using flooded oil producing wells for organizing reservoir pressure maintenance using cross-hole pumping technology, including one or more oil producing wells, a collection pipeline, an injection well, characterized in that water-borne oil producing wells (one or several) are selected for water intake with a production rate of well products which, by calculation, is sufficient for injection into a nearby injection well in order to maintain reservoir pressure I’m in a certain area of the developed oil field, while on the pipeline for oil producing wells, a phase divider of the well products is installed into three components - gas, oil, water, it is also a purifier for produced water from suspended solids, and to increase the injection pressure of produced and purified water in injection well in series, between the phase divider and injection well connected pumping unit located in a shallow pit, and the pumping unit includes one section of Azhinov submersible electric pump with the upper facing discharge side of the casing.