RU73026U1 - DEVICE FOR OIL PRODUCTION AT THE LATE DEVELOPMENT STAGES - Google Patents

Abstract

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

A device for oil production in the late stages of development contains a main tubing string (tubing) with a main packer adapted to be installed at the oil-water contact level, a pumping unit located in the tubing string and communicating with the sub-packer space of the main packer. The device is equipped with an additional tubing string and an additional packer configured to be installed above the formation, the lower end of the additional tubing string being placed below the additional packer and communicated with the overpacker space of the main packer.

1 ill. for 1 liter

Description

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

A device is known for operating a waterlogged oil reservoir (RF patent No. 2238395, IPC 7 ЕВВ 43/00, published in Bulletin No. 29 dated October 20, 2004), containing a differential sucker rod pump run 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 amers and having separate hydraulic channels that connect the differential sucker rod pump to the above-packer and sub-packer zones of the watered 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 shank 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 pressure and suction ball valves in the design of the device reduces the reliability of the device, since during the work they fail due to sticking and / or silting 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 the main column of tubing with a main packer, configured to be installed at the level of the oil-water contact, a pumping unit located in the tubing string and communicating with the sub-packer space of the main packer .

New is that the device is equipped with an additional tubing string and an additional packer configured to be installed above the formation, the lower end of the additional tubing string being placed below the additional packer and communicated with the over-packer space of the main packer.

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 the main column of tubing 1, the main packer 2, configured to be installed at the level of the oil-water contact (VOC) 3, the pumping unit 4, located in the tubing string 1 and communicated with subpacker space 5 of the main packer 2.

The device is equipped with an additional string of tubing 6 and an additional packer 7, configured to be installed above the formation 8, and the lower end of the additional string of tubing 6 is placed below the additional packer 7 and communicated with the overpacker space 9 of the main packer 2.

The device operates as follows:

Before starting the device for oil production in the late stages of development, it is mounted in the well 10, as shown in the figure, with the main packer 2 installed at the level of the oil-water contact (WOC) 3.

Then they launch the device into operation. To do this, first, the mouth of the well 10 injects the fluid through an additional tubing string 6 through the under-packer space 5 of the main packer 2 through the perforations into the aquifer 11 of the formation 8. Water is continued into the reservoir 8 until it is saturated, after which the water is pumped into the aquifer of the formation 11 8 stop.

Next, hold the time in time to equalize the pressure in the reservoir 8. Then begin the selection of oil. To do this, put into operation a pumping unit 4, which pumps oil through the main string of tubing 1 to the surface from the over-packer space 9 of the main packer 2, coming there from the oil-bearing zone 12 of the formation 8 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.

The proposed device for oil production in the late stages of development has a simple design, and the absence of pressure and suction valves, as well as the string of pump rods in the device increases the reliability of its operation.

Claims (1)

A device for oil production in the late stages of development, containing the main column of tubing with a main packer configured to be installed at the level of the oil-water contact, a pumping unit located in the tubing string and communicating with the sub-packer space of the main packer, characterized in that the device is equipped with an additional tubing string and an additional packer configured to be installed above the formation, the lower end of the additional tubing string being placed below the additional itelnogo packer and communicates with the main space nadpakernym packer.