RU72014U1 - DEVICE FOR OIL PRODUCTION AT THE LATE DEVELOPMENT STAGES - Google Patents

Abstract

A device for oil production in the late stages of development, containing a tubing string (tubing), a packer configured to be installed at the oil-water contact level, a pumping unit in communication with an over-packer space and equipped with a pipe, the bottom of which is connected to a sub-packer space, characterized in that the device is equipped with an additional packer configured to be installed above the formation, the above-packer space of which is communicated by bypass channels with the top of the pipe.

Description

The proposal relates to the oil and gas industry, namely the operation of production wells with waterlogged oil reservoirs.

A device for operating a flooded oil reservoir is known (RF patent No. 2238395, IPC 7 ЕВВ 43/00, published in Bulletin No. 29 dated October 20, 2004), containing a differential sucker rod pump launched on a tubing string (tubing) and a packer on the liner, which is installed in the oil-water contact zone of the flooded oil reservoir under the pump, while the differential pump housing consists of two step cylinders and one double hollow plunger with suction and discharge valves, forming two separate chambers and having separate hydraulic channels that connect the differential sucker rod pump to the overpacker and subpacker zones of the waterlogged oil reservoir of the well, while the ratio of the selected volumes, respectively, of oil and water from these zones is determined in a certain relationship, while the lower part of the liner is located below the sole flooded oil reservoir.

The closest in technical essence is a device for oil production in the late stages of development (RF patent No. 2175377, IPC 7 ЕВВ 43/00, published in bulletin No. 30 dated October 27, 2001), containing a housing associated with tubing with the first and second plungers having suction and discharge valves, one of which is connected to the first and second plungers. With suction and discharge valves, one of which is connected to the column of pump rods, and a packer, while the first plunger is connected to the column of pump rods, and at the bottom of the device there is a stationary discharge valve, between which and the first plunger there is a second spring-loaded from the fixed valve side a plunger with suction valves in the upper and lower parts, while in the middle part of the second plunger a groove is made in diameter with a length not less than the stroke of this plunger and the hole in the area of the groove d For the passage of the borehole fluid, and above the second plunger, a stroke limiter of this plunger is located.

Both analog and prototype have common disadvantages:

- firstly, the complexity of the design, due to the large number of components and parts (pump rods, plunger, valve, etc.);

- secondly, the presence of a string of pump rods that are prone to breakage, and discharge and suction ball valves in the design of the device reduce the reliability of the device, since during the process they fail due to sticking and / or siltation of the valve seats and so on.

The objective of the utility model is to simplify the design and increase the reliability of the device for oil production in the late stages of development.

The problem is solved by a device for oil production in the late stages of development, containing a tubing string (tubing), a packer configured to be installed at the oil-water contact level, a pumping unit in communication with an over-packer space and equipped with a pipe, the bottom of which is connected to the under-packer space .

New is that the device is equipped with an additional packer, configured to be installed above the formation, the above-packer space of which is communicated by bypass channels with the top of the pipe.

The figure schematically shows the proposed device for oil production in the late stages of development.

A device for oil production in the late stages of development contains a tubing string (tubing) 1, packer 2, configured to be installed at the level of the oil-water contact (BHC) 3, pump unit 4, in communication with the packer space 5 of packer 2. Below the pump unit 4 the tubing string 2 is equipped with a pipe 6, the bottom of which is in communication with the sub-packer space 7 of the packer 2.

The device is also equipped with an additional packer 8, configured to be installed above the reservoir 9, the above-packer space 10 of the additional packer 8 is indicated by the bypass channels 11 with the upper end of the pipe 5.

The device operates as follows.

Before starting the device for oil production in the late stages of development, it is mounted in the well 12, as shown in the figure, with the packer 2 being installed at the level of the oil-water contact (WOC) 3.

Then they launch the device into operation. To do this, first the mouth (Fig. Not shown) of the well 12 injects fluid through the overpacker space 10 of the additional packer 8 along the bypass channels 11 and the pipe 6 into the underpacker space 7 of the packer 2 and through the perforations into the aquifer 13 of the reservoir 9.

The injection of water into the reservoir 9 is continued until it is saturated, after which the injection of water into the aquifer 13 of the reservoir 9 is stopped. Next, an exposure is made in time to equalize the pressure in the reservoir 9. Then, the selection of oil begins. To do this, run in

the operation of the pumping unit 4, which pumps oil through the tubing string 1 to the surface from the above-packer space 5 of the packer 2, coming there from the oil-bearing zone 14 of the formation 9 through the perforations. The operation of the pumping unit 4 continues until the water cut in the formation increases, after which the pumping unit 4 is turned off and the entire process described above is repeated.

Claims (1)

A device for oil production in the late stages of development, containing a tubing string (tubing), a packer configured to be installed at the oil-water contact level, a pumping unit in communication with an over-packer space and equipped with a pipe, the bottom of which is connected to a sub-packer space, characterized in that the device is equipped with an additional packer configured to be installed above the formation, the above-packer space of which is communicated by bypass channels with the top of the pipe.