RU2368804C1 - Deep-well rod-type pump for well simultaneous separate operation - Google Patents

Abstract

FIELD: engines and pumps.

SUBSTANCE: invention relates to oil simultaneous and separate extraction from two benches. Proposed pump upper cylinder communicating with pump-compressor pipe string, upper plunger with pressure valve communicating with rod string, lower cylinder, lower plunger with pressure valve and lower valve with filter. Upper and lower cylinders communicate via medium cylinder. Upper and lower plungers are coupled by a polished rod arranged in aforesaid medium cylinder to move in gland seal. Lower cylinder and medium cylinder gland seal seat communicate with pump-compressor pipe string via bypass line with valve. Bypass line inlet is arranged in medium cylinder upstream of lower plunger and downstream of gland seal. Lateral suction valve with filter is arranged on bypass line side, nearby it. Lateral suction valve inlet is arranged in medium cylinder downstream of upper plunder lower position and upstream of gland seal. Wall packer is arranged between lower suction valve and lateral suction valve outer surface.

EFFECT: higher efficiency of oil extraction.

1 dwg

Description

The invention relates to the oil industry and may find application in simultaneous-separate oil production from two reservoirs.

A known installation for separate operation of two layers, which includes a column of elevator pipes, sucker rod pump, packer and liner. The sucker rod pump is equipped with an additional suction valve. It is placed on the side wall of the cylinder and divides the cylinder in length into two parts proportional to the productivity of the layers (RF Patent No. 2221136, published. 2004.01.10).

The installation provides the possibility of entering the pump cylinder when the plunger moves upward, first the production of a low-pressure formation, and after the plunger passes an additional valve, the production of a high-pressure formation. The disadvantage of installation is low productivity, tk. only part of the plunger stroke is used to take oil from one reservoir. In addition, when changing the flow rate of one or both formations, it is necessary to stop the well, raise the pump and rework it under the changed conditions, which complicates the work and leads to oil production losses.

Closest to the proposed invention in technical essence is a borehole sucker-rod pumping unit for simultaneous and separate oil production from two reservoirs, which contains a plunger with a cylinder, suction and discharge valves, a side valve for withdrawing fluid from the upper reservoir, a packer, uncoupling reservoirs and located below pump intake. The pump plunger is equipped with a lower diameter plunger located below, having a discharge valve. The side valve is located at the lower end of the larger cylinder. An additional discharge valve is placed in the upper part of the smaller diameter plunger, which is in communication with the space formed by the outer surface of the smaller diameter plunger and a larger pump cylinder (RF Patent No. 2321177, published. 2008.04.10 - prototype).

The installation allows for operation regardless of the location of the formation with high reservoir pressure. However, the installation performance is low due to the location of one plunger in another. In addition, this arrangement of the plungers does not allow the lower plunger to be larger than the upper one or to make equal or greater the selection of oil from the lower layer compared to the upper one.

The invention solves the problem of increasing the productivity of the installation for simultaneous and separate operation of the well, providing the possibility of oil selection from any reservoir with virtually any production rate.

The problem is solved in that in a sucker rod pump for simultaneous and separate well operation, including the upper cylinder, lower cylinder, upper plunger, lower plunger, lower and side suction valves with filters, discharge valves, rod string, tubing string and packer according to the invention, the upper and lower cylinders are connected by the middle cylinder, the upper and lower plungers are interconnected by a polished rod placed in the middle cylinder with the possibility of movement in the stuffing box The lower cylinder and the space of the middle cylinder under the gland seal are connected to the tubing string through the bypass line with the valve, the entrance to the bypass line is located in the middle cylinder above the upper position of the lower plunger and below the stuffing box, the input from the side suction valve is located on average the cylinder below the lower position of the upper plunger and above the stuffing box seal, and the side suction valve is located on the bypass line side next to the bypass line.

The drawing shows a section of the proposed sucker rod pump for simultaneous and separate operation of the well.

The pump includes an upper cylinder 1 connected to the tubing string 2, an upper plunger 3 with a discharge valve 4, connected to a rod string 5, a lower cylinder 6, a lower plunger 7 with a discharge valve 8, a lower suction valve 9 with a filter 10. Upper 1 and lower 6 cylinders are connected by the middle cylinder 11. The upper 2 and lower 7 plungers are interconnected by a polished rod 12 located in the middle cylinder 11 with the possibility of movement in the stuffing box seal 13. The lower cylinder 6 and the space of the middle cylinder 11 under the flax seal 13 is connected to the tubing string 2 through the bypass line 14 with the valve 15. The entrance to the bypass line 14 is located in the middle cylinder 11 above the upper position of the lower plunger 7 and below the stuffing box 13. The side suction valve 16 with the filter 17 is located on side of the bypass line 14 next to the bypass line 14, i.e. the side suction valve 16 is as close as possible in design capabilities to the bypass line 14 (in the drawing, the side suction valve 16 is conventionally shown on the opposite side of the bypass line 14 as if rotated 180 °). The inlet from the side suction valve 16 is located in the middle cylinder 11 below the lower position of the upper plunger 3 and above the stuffing box 13. Between the bottom suction valve 9 and the side suction valve 16 on the outer surface is a packer 18.

Sucker rod pump for simultaneous-separate operation of the well operates as follows.

During the course of the column of rods 5, the upper plunger 3, the polished rod 12 and the lower plunger 7 are moved upward. At the same time, valves 4 and 8 are closed, valves 9, 15 and 16 are open. The upper plunger 3 delivers oil from the upper reservoir above the packer 18 directly to the tubing string 2. The lower plunger 7 delivers oil from the lower reservoir below the packer 18 to the space of the middle cylinder 11 under the stuffing box 13 and then through the bypass line 14 and valve 15 to tubing string 2. The cavities of the upper 1 and lower 6 cylinders under the upper 3 and lower 7 plungers, respectively, are filled with oil. The stuffing box 13 prevents overflows from the lower cavity of the middle cylinder 11 under the stuffing box 13 into the upper cavity of the middle cylinder 11 above the stuffing box 13. Filters 10 and 17 provide purified oil to the plungers 3 and 7.

During the course of the rod string 5, the upper plunger 3, the polished rod 12 and the lower plunger 7 move downward. In this case, the valves 4 and 8 are open, the valves 9, 15 and 16 are closed. The upper 3 and lower 7 plungers are filled with oil. The packing 13 prevents overflows from the lower cavity of the middle cylinder 11 under the packing 13 into the upper cavity of the middle cylinder 11 above the packing 13 and vice versa.

Placing the side suction valve 16 with filter 17 on the side of the bypass line 14 next to the bypass line 14 helps to minimize the transverse dimensions of the pump and place it in a small diameter well.

The proposed sucker rod pump for simultaneous and separate well operation can replace electric centrifugal pumps in production wells with a flow rate of 45-100 m ³ , which have a very short overhaul period due to the presence of salts in the oil, sand removal, the presence of water-oil emulsion and asphalt-resin-paraffin deposits on complicated well stock.

The upper and lower pumps can be the same or different performance. In this case, the performance of one, for example, the upper pump can be either greater or less.

The determining parameters when choosing a pump size are the depth of the reservoir, flow rate and the expected fluid withdrawal from the well at the optimum allowable bottom-hole pressure and the established technological mode.

The use of a universal sucker rod pump allows:

- individually select any pump size depending on the flow rate of the well;

- to replace pumps in wells with a large number of swings to reduce the reduced stress on the rod string by reducing the number of swings and increasing the trouble-free operation with deep pumping equipment without reducing the flow rate of the well;

- bring the well to optimal parameters;

- change or replace electric centrifugal pumps of the ETsN-45, 50, 60, 80 type with a flow rate of 45-100 m ³ / day with short overhauls and operating on a complicated well stock without reducing oil production;

- save energy when transferring from an electric centrifugal pump to a sucker rod pump;

- operate wells at optimal bottomhole pressures;

- apply a differentiated approach to the production capabilities of each development object at wells.

Claims (1)

Deep-well sucker rod pump for simultaneous and separate well operation, including an upper cylinder, a lower cylinder, an upper plunger, a lower plunger, a lower and a side suction valve with filters, pressure valves, a rod string, a tubing string and a packer, characterized in that the upper and the lower cylinders are connected by the middle cylinder, the upper and lower plungers are interconnected by a polished rod placed in the middle cylinder with the possibility of movement in the stuffing box seal, the lower cylinder and simple The middle cylinder under the packing is connected to the tubing string through the bypass line with the valve, the bypass line is located in the middle cylinder above the upper position of the lower plunger and below the packing, the inlet from the side suction valve is located in the middle cylinder below the lower position of the upper the plunger and above the stuffing box seal, and the side suction valve is located on the bypass line side next to the bypass line.

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