RU2335625C1 - Facility for operating of well - Google Patents

Abstract

FIELD: mining.

SUBSTANCE: facility includes packer in space between beds, pipe column with suction valve and radial apertures for communicating with annular space above packer and electro centrifugal pump. The electro centrifugal pump is equipped with an exterior pressure tight case designed so as to isolate pump suction from the annular space and to be hydraulically connected with the cavity of pipe column below the pump. A cylinder chamber is installed above the pump on the pipe column; the said chamber has interior sealing rings, a rest saddle, radial apertures for communicating with annular space and an interior circular groove at the level of radial apertures. In the cylinder chamber there is placed a removable connecting unit with an axial pass-through channel equipped with a gripping component, an exterior sealing ring and calibrating radial replaceable sleeves in its middle portion. In the lower portion of the connecting unit there is assembled a spring lock for fixation of the unit in the rest saddle of the cylinder chamber. At the flow line of the well a system for variation of liquid consumption is installed.

EFFECT: possibility to swap liquid and to control consumption and pressure of liquid pumping during inside and between well swapping.

2 dwg

Description

The invention relates to the oil industry and may find application in the operation of a well in a system for maintaining reservoir pressure while simultaneously pumping downhole and downhole pumping of produced water.

A known method of developing a multilayer heterogeneous oil reservoir, including the selection of oil through producing wells from the reservoirs, the selection of produced water from the underlying reservoir through the water wells and pumping formation water through injection wells into the reservoirs. At the same time, additional wells are drilled to the entire depth of the reservoir. When passing through an oil reservoir, wells are operated as producing. When passing to the underlying layer, bypassing the oil reservoir, the wells are operated as water intakes, the reservoir underlying water is taken through them and pumped as a working agent through injection wells into the oil reservoirs. Formation underlying water is pumped from the water well to the injection well through pressurized pipelines without contact with atmospheric oxygen and without breaking the stream. Water wells are equipped with high-performance electric centrifugal pumps and connected to the nearest injection wells with sealed ground water conduits (RF Patent No. 2061177, publ. 1996.05.27).

Known technical solution does not allow for downhole fluid transfer.

Closest to the proposed invention in technical essence is an installation for pumping fluid from the lower formation into the upper well formation, including a packer, a pipe string with a suction valve and an electric submersible pump mounted above the suction valve as part of a pipe string equipped with a channel through which the cavity of the column the pipes above the pump are in communication with the upper layer, and the cavity of the pipe string below the pump through the suction valve is in communication with the lower layer when pumping liquid from the annulus e packer lower reservoir zone in the upper layer of the well (RF Patent №2287671, published 2006.11.20 -. prototype).

The known installation does not allow for cross-pumping fluid. In addition, the installation does not allow you to adjust the flow rate and pressure of fluid injection during intra- and interwell pumping.

The proposed installation solves the problem of performing cross-hole pumping of liquids and regulating the flow rates and pressures of pumping fluid during intra- and inter-well pumping.

The problem is solved in that in the installation for the operation of the well, comprising a packer between the formations, a pipe string with a suction valve and radial openings for communication with the annulus above the packer and an electric centrifugal pump, according to the invention, the electric centrifugal pump is equipped with an external sealing casing configured to be insulated receiving the pump from the annular space and its hydraulic connection with the cavity of the pipe string below the pump, above the pump on the pipe string is installed an cylindrical chamber having internal sealing rings, a supporting saddle, radial holes for communication with the annular space and an inner annular groove at the level of the radial holes, a removable fitting assembly with an axial through passage channel, provided with a gripping element, an external sealing ring and calibrated radial interchangeable fittings in its middle part, and a spring lock is mounted in the lower part of the fitting unit to fix it in the supporting seat of the cylinder an indigenous chamber, and a system for changing fluid flow is located on the flow line of a well.

SUMMARY OF THE INVENTION

Figure 1 presents the claimed installation, figure 2 is a longitudinal section of a cylindrical chamber with a removable fitting unit located therein.

Well 1 has a production casing 2 with perforated intervals opposite the aquifer 3 and oil 4 reservoir. A pipe string 5 is lowered into the well, equipped with a packer 6 mounted above the aquifer 3. The pipe string 5 has a shank pipe 7 with a check valve 8.

The electric centrifugal pump 9 is suspended on a pipe string 5 and placed in a casing 10, which is sealed with a mechanical seal 12 at the upper end above the intake filter 11 of the pump 9, and rigidly connected to the shank 13, suspended from the electric motor 14 of the pump 9. The casing 10 isolates the receiving filter 11 from the annular space of the well 1 and hydraulically connects it through the windows 15 of the liner 13 to the area under the packer 6. Above the pump, on the pipe string 5, there is a cylindrical chamber 16 with internal o-rings 17, a support seat 18, c internal annular groove 19 at the level of its radial holes 20. A removable fitting 21 with an axial through passage channel 22 is placed in a cylindrical chamber 16 and is equipped with a gripping element 23, an outer sealing ring 24, as well as in its middle part calibrated radial replaceable fittings 25. B the lower part of the fitting assembly 21 has a spring lock 26 for fixing it in the support seat 18 of the cylindrical chamber 16. On the flow line 27 of the well 1 there is a fluid flow rate changing system consisting of valves 28 and / or a fitting 29.

Installation works as follows

In the well 1, the arrangement according to FIGS. 1 and 2 is assembled. The flow line 27 of the well 1 is connected to the water supply to the injection wells (not shown). Depending on the injectivity of the injection wells and oil reservoir 3, the required injection pressure and flow rate, the characteristics of the electric centrifugal pump 9, the required diameter of the fittings 25 and fittings 29 is selected (or the opening of the valves 28 is controlled). The fitting 25 is pre-installed in the nozzle assembly 21. During the operation of the electric centrifugal pump 9, the rising flow of produced water, passing the check valve 8 and the window 15, enters the intake filter 11 of the pump 9. Then, using the electric centrifugal pump 9, the produced water rises along the pipe string 5 and at the level of the fittings 25 is divided into upstream and downstream. The discharge stream in the annulus above poker 6 creates excess pressure, due to which part of the water is pumped into the oil reservoir 4, and the upward flow of water at the wellhead 1 along flow line 27 is directed to other injection wells. After the well 1 has reached the established operating mode, the depth flow meter is lowered and the liquid flow rate is determined in two intervals, to determine the volume of injected water into the upper oil reservoir 4 and to clarify the required diameter of the fittings 25 into the pipe string 5. above and below the removable fitting unit 21. If necessary, the regulation of water flow into the reservoir 4 is carried out by replacing the fittings 25 with fittings of a different diameter. To this end, a fishing device (not shown) is lowered into the pipe string 5 on a cable technique, which is hooked into the gripping element 23, and the choke assembly 21 is removed from the chamber 16. After replacing the fittings 25 for fitting the choke assembly 21 in the cylindrical chamber 16 from the wellhead through the lubricator, it is discharged into the pipe string 5. Upon reaching the cylindrical chamber 16 and the spring lock 26, it is fixed in the support seat 18 of the cylindrical chamber 16. In this case, the fittings 25 are located at the level of the inner annular groove 19 of the cylindrical cam ry 16.

The presence of a check valve 8 under the packer 6 prevents the overflow of the working agent from the oil-bearing 4 into the aquifer 3.

The proposed installation, along with the selection of produced water from the underlying aquifer 3 of well 1 and downhole pumping of water into the upper oil-saturated formation 4, also performs cross-well pumping of produced water to other injection wells with the provision of redistribution and measurement of water flow as a working agent. At the same time, there is no need to use a separate injection well and a water line for pumping water into an overlying oil-saturated formation 4, located in a single section of the wellbore 1, which increases the efficiency of the work to maintain reservoir pressure by cross-pumping water.

Claims (1)

Installation for the operation of the well, including a packer between the layers, a pipe string with a suction valve and radial holes for communication with the annulus above the packer and an electric centrifugal pump, characterized in that the electric centrifugal pump is equipped with an external sealing casing made with the possibility of isolating the pump intake from the annular space and its hydraulic connection with the cavity of the pipe string below the pump, above the pump, a cylindrical chamber is installed on the pipe string, having containing inner o-rings, support seat, radial openings for communication with the annular space and an inner annular groove at the level of the radial holes, a removable fitting assembly in the cylindrical chamber with an axial through passage, provided with a gripping element, an external sealing ring and calibrated radial interchangeable fittings in its middle part, and a spring lock is mounted in the lower part of the fitting assembly to fix it in the supporting saddle of the cylindrical chamber, and on Kidney lines well placed system changes the liquid flow rate.

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