CN1740567A - A hydraulic pumping device for inclined wells - Google Patents

Abstract

A hydraulic oil pumping device for an inclined shaft relates to a hydraulic power device for oil exploitation. The hydraulic automatic compensation system is characterized in that a power pump is connected with an inlet of an electro-hydraulic reversing valve, an outlet A of the electro-hydraulic reversing valve is connected with an energy converter to form a hydraulic power system, the energy converter is connected with a well head and a small oil pipe to form a hydraulic drive conversion pipeline, a proximity switch is respectively connected with a pressure relay and the electro-hydraulic reversing valve through leads to form a pressure control automatic reversing device, and a liquid supplementing valve is connected with an oil-water separator and forms a power liquid automatic compensation system together with an energy accumulator and a voltage stabilizer. The device can protect the oil pipe from being damaged, prolongs the pump checking period, reduces the operating cost of the oil well, improves the production efficiency of the oil well, has low operating cost, saves electric energy, can automatically compensate the power fluid loss in a hydraulic system, and ensures the normal work of the oil pipe. The present invention is especially suitable for oil extraction in oil well with great well inclination.

Description

A hydraulic pumping device for inclined wells

technical field

The invention relates to a hydraulic power device for oil exploitation.

Background technique

At present, the equipment for underground oil exploitation in oil fields is mainly based on the rod pump. This rod pump device is driven by the surface beam pumping unit through the sucker rod to reciprocate the downhole pump to lift the liquid produced in the formation to the ground. This pumping method is used in a vertical wellbore, and the eccentric wear between the sucker rod and the tubing is not obvious. If it is used in an inclined wellbore, the eccentric wear between the sucker rod and the tubing will follow. The slope of the barrel increases and becomes heavier. According to data statistics, the sucker rod breakage accident caused by eccentric wear has reached more than 30% of the oil well pump inspection workload. The eccentric wear of the sucker rod in this kind of inclined well, on the one hand, increases the workload of the pump inspection operation, increases the cost of the pump inspection operation, and also greatly reduces the life of the oil pipe and sucker rod. Rods increase production costs. Frequent pump inspection operations greatly reduce the production timeliness of the oil well, which directly affects the production efficiency of the oil well. Although there are also some hydraulic piston pumps in the oil field, their efficiency is low, the highest is only 25%, because there are many problems in technology and economy, they are rarely used at present.

Contents of the invention

The object of the present invention is to provide a hydraulic oil pumping device for inclined wells, which uses liquid as the power medium to drive the hydraulic oil pump in the well, and fundamentally solves the deviation caused by the reciprocating motion of the sucker rod in the oil pipe in the inclined well oil production. Grinding problems can improve work efficiency, reduce investment costs and production costs.

The technical solution of the present invention is achieved in this way, a hydraulic oil pumping device for inclined wells, which is connected by a motor and a power pump, and the power pump is connected to the wellhead through a pipeline. Its special features are: (1) the power pump 2 The inlet P of the electro-hydraulic reversing valve 8 is connected through the pipeline, and the outlet A thereof is connected with the energy converters 19 and 18 through the pipelines 12 and 14 respectively, and the inlet B of the electro-hydraulic reversing valve 8 is connected with the energy converters 19 and 18 through the pipelines 13 and 15 respectively. The energy converters 19 and 18 are connected, and the outlet T of the electro-hydraulic reversing valve 8 is connected with the oil tank 1 through the pipeline 4 to form a hydraulic power system. (2) The energy converter 18 is connected to the joint of the wellhead 34 through the pipeline 33, and the energy converter 19 is connected to the upper end of the small oil pipe 36 through the pipeline 32 to form a fluid-driven conversion pipeline. (3) The replenishment valve 22 is connected to the pipelines 15, 33, 32, and 12 through the pipelines 9, 20, 21, and 31, respectively. (4) The pressure relays 11 and 10 are connected to the pipelines 12 and 13 respectively. (5) Proximity switches 16 and 17 are installed on the upper ends of energy converters 18 and 19 respectively, and are respectively connected with pressure relays 11 and 10 and electro-hydraulic switching valve 8 through wires to form a pressure control automatic reversing device. (6) The replenishment valve 22 is connected to the oil-water separator 24 through the pipeline 23, and a voltage stabilizer 28 is installed between the pipeline 23 and the pipeline 29 through the pipeline, and they together constitute a power fluid automatic compensation system.

The beneficial effects of the present invention are: (1) the hydraulic oil pumping device and the hydraulic oil pump installed in the downhole are matched to form a hydraulic oil pumping system, and the oil pump is driven by the power fluid to work, which completely avoids the mechanical reciprocating movement in the wellbore, so In the wellbore of any inclination, there will be no friction on the oil pipe, which can protect the oil pipe from damage, extend the pump inspection cycle, reduce the number and time of oil well pump inspection operations, reduce the operating cost of the oil well, and improve the production efficiency of the oil well. . (2) Since the parts adopted in the device are small in size and simple in structure, the investment cost can be reduced, and the investment cost can be saved by about 70%. (3) Compared with the hydraulic piston pump system, the hydraulic pumping device has no loss of power fluid, no power fluid dehydration matching, low operating cost, and can save about 30% of electricity. (4) Since the hydraulic pumping device has a pressure-controlled automatic reversing device, it can automatically reversing according to the working requirements of the downhole pump. (5) The hydraulic oil pumping device also has an automatic power fluid compensation system, which can automatically compensate the loss of power fluid in the hydraulic system to ensure its normal operation.

Description of drawings

Accompanying drawing is the schematic diagram that each component of the present invention is connected with pipeline and is connected together with oil well.

Detailed ways

The power pump 2 is a manual variable hydraulic pump, which is connected with the motor 3 through a coupling. The power pump 2 communicates with the oil tank 1 through pipelines, valves and heat exchangers. The outlet of the power pump 2 is connected with the inlet P of the electro-hydraulic reversing valve 8 through a pipeline 6 , and a check valve is installed on the pipeline 6 . The energy converters 18 and 19 adopt ZL01278477 patent technology. The outlet A of the electro-hydraulic reversing valve 8 is connected with the lower interface of the energy converter 19 through the pipeline 12 and connected with the upper interface of the energy converter 18 through the pipeline 14 . The inlet B of the electro-hydraulic reversing valve 8 is connected with the upper port of the energy converter 19 through the pipeline 13 and connected with the lower port of the energy converter 18 through the pipeline 15 . Pressure relays 11, 10 are respectively installed on the pipelines 12, 13. The outlet T of the electro-hydraulic reversing valve 8 communicates with the oil tank 1 through the pipeline 4. A pressure gauge, a check valve and a radiator are installed on the pipeline 4, and a voltage stabilizer 5 is installed through the pipeline between the pipelines 4 and 6. An accumulator 7 is also installed on the pipeline 6 through a restrictor and a valve. The lower end interface of the energy converter 18 is connected with the joint of the wellhead 34 through the pipeline 33 , and the lower end interface of the energy converter 19 is connected with the upper end of the small oil pipe 36 through the pipeline 32 . Proximity switches 16, 17 are installed on the upper ends of energy converters 18, 19 respectively, and proximity switches 16, 17 are respectively connected with pressure relays 11, 10 and electro-hydraulic switching valve 8 through wires to form a pressure control automatic reversing device, which can effectively The reciprocating motion of the downhole pump 38 is precisely controlled. The left end interface of the replenishment valve 22 is connected to the pipeline 15 through the pipeline 9, the right end interface is connected to the pipeline 12 through the pipeline 31, the upper left interface of the liquid replenishment valve 22 is connected to the pipeline 33 through the pipeline 20, and the upper right interface is connected to the pipeline 32 through the pipeline 21 , the lower interface of which is connected to the lower right interface of the oil-water separator 24 through the pipeline 23, and a valve and a check valve are installed on the pipeline 23. The upper right interface of the oil-water separator 24 is connected with a pipeline 29, and a pressure stabilizing valve is installed on the pipeline 29. A pipeline is connected between the pipeline 23 and the pipeline 29, and an accumulator 27, a pressure stabilizing valve 28 and a pressure gauge are installed on the pipeline. The replenishment valve 22, the oil-water separator 24 and the pressure-stabilizing valve 28 constitute an automatic replenishment system. Under the action of hydraulic power, the slide valve in the replenishment valve 22 is opened or closed, and the oil-water separator 24 provides liquid to compensate the loss of downhole power fluid. and leakage, so that the downhole pump 38 can work at full stroke. One end of the pipeline 25 is connected to the core of the oil-water separator 24 , and the other end is connected to the heat exchanger 26 installed in the oil tank 1 , and the other end of the heat exchanger 26 is connected to the interface of the pipeline 30 and the casing 47 . The above fuel tank 1, power pump 2, motor 3, electro-hydraulic reversing valve 8, energy converters 18, 19, replenishment valve 22, oil-water separator 24, etc. are connected together by pipelines and installed in the ground hydraulic station. A packer 41 is installed in the casing 37 of the wellbore, and the fixed valve 40, the drain valve 39 and the downhole pump 38 are screwed together, and the downhole pump 38 adopts ZL01275433 patented technology. The small oil pipe 36 is sleeved in the large oil pipe 35, an annular space is formed between them, and their lower ends are connected with the upper end of the downhole pump 38.

When the oil well is in production, the motor 3 drives the power pump 2 to provide the power fluid, through the energy converters 18 and 19, water is used as the medium as the power fluid, and the pipelines 32 and 33 respectively enter the small oil pipe 36 and between the large and small oil pipes In the annular space, the piston in the downhole pump 38 is driven to reciprocate up and down. Driven by the piston, the plunger in the downhole pump 38 sucks liquid up through the fixed valve 40 and then closes. In the annular space, because the packer 41 is installed in the casing 37 of the wellbore, the drained liquid cannot return to the suction port of the downhole pump 38, but can only be discharged to the ground through the annular space of the casing to realize the purpose of oil recovery. The invention is especially suitable for oil production in oil wells with relatively large well body inclination.

Claims (1)

1. an inclined shaft hydraulic oil pumping device is connect with kinetic pump (2) mutually by motor (3), and kinetic pump (2) is connected to form by pipeline and well head, it is characterized in that:

1. kinetic pump (2) is connected by the import P of pipeline (6) with electro-hydraulic reversing valve (8), its outlet A is connected with enegrgy converter (19,18) respectively by pipeline (12,14), the import B of electro-hydraulic reversing valve (8) is connected with enegrgy converter (19,18) respectively by pipeline (13,15), the outlet T of electro-hydraulic reversing valve (8) is connected with fuel tank (1) by pipeline, constitutes hydraulic power system;

2. enegrgy converter (18) is connected by the joint of pipeline (33) with well head (34), and enegrgy converter (19) is connected by the upper end of pipeline (32) with little oil pipe (36), forms liquid and drives the conversion pipeline;

3. make-up valve (22) is connected with pipeline (15,33,32,12) respectively by pipeline (9,20,21,31);

4. on pipeline (12,13), be connected with pressure relay (11,10) respectively;

5. be installed in the upper end of enegrgy converter (18,19) near switch (16,17) respectively, be connected with pressure relay (11,10) and electric liquid changing valve (8) respectively, constitute the pressure control automatic reversing apparatus by lead;

6. make-up valve (22) is connected with oil and water seperator (24) by pipeline (23), by pipeline voltage stabilizer (28) is installed between pipeline (23) and the pipeline (29), and they constitute the power fluid self compensating system jointly.