RU2439367C1 - Downhole hydraulically driven pump assembly - Google Patents

Abstract

FIELD: engines and pumps.

SUBSTANCE: proposed assembly comprises strong of downhole diaphragm pumps (26, 27, 28, 29) and pump unit downed into well on tubing string (TS). Working chambers of said pumps are connected to common lines feeding pulsating working fluid flow to ensure section and delivery conditions in working chamber. Working chamber 35 communicates via valves 34 with well hole clearance and TS pipeline 1. Pump unit consists of working fluid tank 23, hydro automatic unit, hydraulic power unit and auxiliary unit. The latter comprises hydraulic pump 25 and compressor 24. Hydraulic pump feeds working fluid from tank 23 into hydraulic line of hydro automatic unit. Compressor feeds compressed air into hydro automatic unit pneumatic line. Hydraulic power unit comprises hydraulic accumulator 21 communicated with tank 23. Said hydraulic accumulator 21 communicates in its turn via electronic-control electromagnetic valves with lines of downhole pumps.

EFFECT: higher efficiency and reliability, simplified design and adjustments.

2 dwg

Description

The invention relates to devices for the production of highly viscous oil and bitumen from boreholes.

A deep hydraulic drive device is known comprising a submersible pump lowered into a well on a tubing string (tubing), the working cavities of which are connected to pipelines for supplying a pulsating flow of the working fluid, providing suction and discharge modes in the working chamber communicated through the valves with the annulus of the well and tubing, and a pump unit consisting of a tank with a working fluid, a hydraulic unit and a hydraulic power unit (see RU 2331757, publ. 10.01.2008). The disadvantages of the known device are the use as a generator of pulsating fluid flows of a bulky plunger pump, the complexity of regulation due to changes in speed on its shaft and the unreliability due to the use of one submersible pump.

The objective of the invention is to remedy these disadvantages. The technical result consists in increasing productivity, simplifying the design and adjusting operating modes, as well as increasing the reliability of the device. The problem is solved, and the technical result is achieved by the fact that the deep hydraulic pumping device comprises a string of diaphragm submersible pumps that are lowered into the well on a string of tubing (tubing), the working cavities of each of which are connected to common highways to supply a pulsating flow of working fluid, providing modes of suction and discharge in the working chamber communicated through valves with the annular space of the well and the tubing tubing, and a pump unit consisting of a tank with a slave fluid, a hydraulic unit, a hydraulic power unit and an auxiliary unit, the latter containing a hydraulic pump that provides a supply of working fluid from the tank to the hydraulic line of the hydraulic unit, and a compressor that supplies compressed air to the pneumatic line of this unit, and the hydraulic unit contains a working fluid in communication with the tank liquid accumulator, communicated, in turn, through a system of solenoid valves controlled by the electronic unit with the lines of submersible pumps.

Figure 1 presents a diagram of the proposed device;

figure 2 - diaphragm submersible pump.

Hydraulic deep-well pumping device includes:

1 - tubing string (tubing), which is a pipeline for pumping fluid from a string of pumps to the destination;

41, 51, 61 - pipelines for supplying the pumped liquid from the pumps 26, 27, 28, 29 to the pipeline 1 and fastening them together;

411 - internal pipelines for pumping fluid between pumps 26, 27, 28, 29;

2, 3 - supply lines of the working fluid to the garland of pumps from the hydraulic unit and vice versa;

42, 43, 52, 53, 62, 63 - pipelines for the supply of working fluid between the pumps 26, 27, 28, 29;

422, 433 - internal pipelines for the supply of working fluid between the pumps 26, 27, 28, 29;

6, 7, 8, 9, 10, 11, 12, 13, 14 - pipelines of the hydraulic unit;

15, 16, 17, 18 - hydraulic valves with electromagnetic control;

19 - electric valve control unit 15, 16, 17, 18;

20 - pressure reducing valve with pneumo-hydraulic control elements for the required working pressure;

21 - accumulator;

22 - the main working hydraulic pump;

23 - tank for the working fluid;

24 - compressor;

25 - auxiliary hydraulic pump;

M ₁ , M ₂ - pressure gauges;

B ₁ , B ₂ , B ₃ , B ₄ , B ₅ - valves;

26, 27, 28, 29 - hydraulic submersible pumps (number of installed one or more if necessary);

30 - aperture;

31, 32 - working cavity of the drive hydraulic cylinders;

33 - discharge valve;

34 - intake valve;

35 - working chamber of the pump;

36 - a piston of a hydraulic cylinder;

37 - the rod of the hydraulic cylinder (drive rod of the diaphragm 30).

Functionally, the device can be divided into two parts: a pump unit and a garland of diaphragm submersible pumps. Pumps 26, 27, 28, 29 are lowered into the well on a tubing string in the form of pipeline 1. To supply a pulsating flow of working fluid, working cavities 31, 32 of pumps 26, 27, 28, 29 are connected to common highways 2, 3, providing suction and discharge modes in the working chamber 35. The working chamber 35 through the valve 34 communicates with the annular space of the well, and through the valve 33 - with the pipe 1. The pump unit includes a tank with working fluid 23, a hydraulic unit, a hydraulic power unit and an auxiliary unit . The auxiliary unit contains a hydraulic pump 25, which supplies the working fluid 23 from the tank to the hydraulic line of the hydraulic unit, and a compressor 24, which supplies compressed air to the pneumatic line of this unit. The hydraulic power unit contains a hydraulic accumulator 21, in communication with the tank of the working fluid 23 and the mains 2, 3 of submersible pumps 26, 27, 28, 29. Between the hydraulic accumulator 21 and the mains 2, 3 there is a system of electromagnetic valves controlled by the electronic unit 19, 15, 16, 17, 18 .

The device operates as follows.

A garland of hydraulic drive pumps 26, 27, 28, 29 is lowered into the well, fastened together by pipelines 41, 51, 61 and attached to pipeline 1. Highways 2, 3 are attached to pipeline 1 to supply working fluid to pumps 26, 27, 28, 29 Pipelines 42, 43, 52, 53, 62, 63 are attached to pipelines 41, 51, 61 for supplying a working fluid between pumps 26, 27, 28, 29. Pipelines 1, 41, 51, 61, 411 provide a pumped liquid supply the entire garland and pipeline 1 to the destination. Highways 2 and 3 together with pipelines 42, 52, 62, 422 and 43, 53, 62, 433 provide the supply of working fluid to the working cavities 31, 32 of the pumps 26, 27, 28, 29 and the return of the working fluid to the pump unit. The filling of the working chambers 35 of the pumps 26, 27, 28, 29 is carried out through the valves 34 from the outer space of the pumps. At a convenient distance from the well, a pump unit is installed. Air is pumped into the receiver of the valve 20 by the compressor 24 through the В ₂ pipeline 9, then the compressor is turned off, В _{2 is} closed, В _{3 is} opened and the hydraulic pump 25 pumps the working fluid through the pipeline 9 to the required pressure. After that, the hydraulic pump 25 is turned off, and B _{3 is} closed. Valve 20 sets the required working pressure.

Then include the hydraulic pump 22, the working fluid from the tank 23 through B ₁ and pipe 4, the pump 22, the pipe 5, the accumulator 21, the pipe 7 and the pipes 13, 14 are supplied to the valves 15, 16. In this case, the excess working fluid through the pipe 10, the valve 20 and pipeline 6 returns to the tank 23. Valves 15, 16, 17, 18 are connected to a source of electricity. The electronic valve control unit 19 delivers electrical signals to terminals “a” and “b” alternately at a predetermined time interval.

The inclusion of valves 15, 17 and 16, 18 is as follows.

Mode 1: 15, 17 - on (open)

16, 18 - disabled (closed).

The working fluid through the valve 15 along the line 3 is fed to a garland of pumps 26, 27, 28, 29. The pistons 36 are moved down the rods 37 and bend the diaphragms 30. Through the valves 34 the chambers 35 are filled with the pumped liquid. At this time, from the chambers 32, the working fluid through pipelines 422, 42, 52, 62, line 2, valve 17 and pipe 6 is returned to the tank 23.

Mode 2: valves 16, 18 - on (open)

15, 17 - disabled (closed).

The working fluid through the valve 16 and the line 2 is supplied to the garland of the pumps 26, 27, 28, 29 through the pipes 422, 42, 52, 62 to the working cavities 32. The pistons 36 are moved up the rods 37 and bend the diaphragms 30. Through the valves 33 extruded pumped liquid from the chambers 35 through pipelines 411, 41, 51, 61 and supply to the pipeline 1 for supply to the destination through B ₅ . At the same time, M ₂ provides visual control of the operation of pumps 26, 27, 28, 29. At this time, from the chambers 31, the working fluid through pipelines 433, 43, 53, 63, line 3, valve 18 and pipelines 11, 6 is returned to the tank 23. Further cycles are repeated.

The proposed deep hydraulic pumping device allows you to:

- increase productivity by increasing the number of submersible autonomously working pumps (garland);

- to simplify the circuit and reduce metal consumption through the use of an electronic control unit for the flow of working fluid;

- to increase the reliability of the system through the use of a garland of submersible pumps (if one or several pumps fail, the device continues to work);

- expand the range and simplify the regulation of the frequency of pulsating flows of the working fluid by an electronic control unit, which, in turn, allows you to accurately and widely control the performance of the device even if one or more submersible pumps fails.

Claims (1)

A deep hydraulic drive pump device containing a string of diaphragm submersible pumps lowered into a well on a string of tubing (tubing), the working cavities of each of which are connected to common lines for supplying a pulsating flow of the working fluid, providing suction and discharge modes in the working chamber communicated through valves with the annulus of the well and tubing, and a pump unit consisting of a tank with a working fluid, a hydraulic unit, a hydraulic power unit and auxiliary unit, and the latter contains a hydraulic pump that ensures the supply of working fluid from the tank to the hydraulic line of the hydraulic unit, and a compressor that supplies compressed air to the pneumatic line of this unit, and the hydraulic power unit contains a hydraulic accumulator communicated with the working fluid tank, in turn, communicated via an electronic unit-controlled solenoid valve system with submersible pump lines.

Images