Two-way reversing device of hydraulic drive differential type drainage pump

Abstract

The utility model provides a two-way reversing device of a hydraulic drive differential type drainage pump, which comprises a two-way sleeve, a two-way core is fixedly arranged in the two-way sleeve, and two sides of the two-way sleeve and two sides of the two-way core are provided with corresponding through holes and side holes; overflowing channels are formed between the two sides of the two-way core and the two-way sleeve, and are communicated with an inner liquid channel in the middle of the two-way sleeve; a center hole is formed in the middle of the two-way core and communicated with an outer liquid channel outside the two-way sleeve through the side hole and the through hole. The two-way design is adopted, the overflowing area is increased, the overflowing channel is designed to be of a conical structure, and fluid resistance can be effectively reduced; and a combined welding structure is adopted, so that the processing difficulty is reduced, the performance is reliable, the processing is easy, and the batch production is convenient.

Description

Technical Field

[0001] The utility model relates to the technical field of drainage and production equipment, in particular to a double-pass commutation device for a hydraulic-driven differential drainage and production pump. Background Technique

[0002] Coalbed methane is one of the important energy resources in the world. At present, in the utilization of coalbed methane drainage and gas production equipment, the mechanical drainage and production of coalbed methane in China mainly uses equipment such as rod pumps. Although the normal production of coalbed methane is ensured, there are certain limitations. In the process of deep coalbed methane drainage and production, for large-inclination and horizontal well coalbed methane well types, the traditional rod pump drainage and production equipment has serious rod and pipe eccentric wear problems, which seriously affect the on-site production.

[0003] At present, in the structure of this device, most are designed as an integral structure, with a waist-shaped hole in the middle. The inner pipe hydraulically drives the plunger assembly to move downward, and the outer pipe hydraulically drives the plunger assembly to move upward. In actual application, this structure has the following defects:

[0004] 1. In the integral structure, the processing of the waist-shaped hole is difficult, the processing cost is high, and the processing efficiency is low;

[0005] 2. The cross-sectional area of the outer pipe is large, and the volume of the driving liquid required is large. The cross-sectional area of the inner pipe is small, and the volume of the driving liquid required is small. In the conventional design, the liquid in the outer pipe drives the plunger assembly to move upward, and the liquid in the inner pipe drives the plunger assembly to move downward. From the wellhead, when the outer pipe drives the plunger assembly to move upward, the working condition environment required for this device is 25 MPa. The volume of the liquid required for the outer pipe driving liquid is large, the response time of the plunger assembly moving upward is long, and the pump efficiency of the whole pump is low, which affects the working efficiency of on-site production. Content of the Utility Model

[0006] The main purpose of the utility model is to provide a double-pass commutation device for a hydraulic-driven differential drainage and production pump to solve the problems in the above background technique.

[0007] To solve the above technical problems, the technical solution adopted by the utility model is: it includes a double-pass sleeve, a double-pass core is fixedly arranged in the double-pass sleeve, and corresponding through holes and side holes are arranged on both sides of the double-pass sleeve and the double-pass core;

[0008] Flow channels are arranged between both sides of the double-pass core and the double-pass sleeve, and the flow channels are communicated with the inner liquid channel in the middle of the double-pass sleeve;

[0009] A central hole is arranged in the middle of the double-pass core, and the central hole is communicated with the outer liquid channel outside the double-pass sleeve through the side hole and the through hole.

[0010] Preferably, an installation hole is arranged in the double-pass sleeve, a positioning conical surface is arranged at the end of the installation hole, the outer side of the double-pass core abuts against the installation hole, and the end surface of the double-pass core abuts against the positioning conical surface.

[0011] Preferably, both the mounting hole and the end of the double-pass core are provided with bevels, and are fixedly welded at the bevels, thereby connecting and fixing the double-pass core and the double-pass sleeve.

[0012] Preferably, the diameter of the side hole is smaller than that of the through hole, and they are fixedly welded between the side hole and the through hole, thereby connecting and fixing the double-pass core and the double-pass sleeve.

[0013] Preferably, the end of the double-pass sleeve is communicated with the oil pipe, the outside of the double-pass sleeve is hermetically connected with the outer pipe of the production pumping unit through a sealing ring, and the end of the double-pass core is communicated with the hollow sucker rod.

[0014] The utility model provides a double-pass commutation device for a hydraulically driven differential production pumping unit, and the beneficial effects are as follows:

[0015] 1. Design a limiting structure to ensure that the double-pass core can be effectively positioned, facilitating welding;

[0016] 2. The flow-through channel is designed with a conical structure, which can effectively reduce the resistance of the fluid;

[0017] 3. Adopt a double-pass design to increase the flow-through area, enabling the driving fluid to be commuted, with the inner fluid driving the plunger assembly to move upward and the outer fluid driving the plunger assembly to move downward, reducing liquid loss, lowering the cost of drainage and gas production, and improving the working efficiency of the whole pump;

[0018] 4. Adopt a combined welding structure, reducing the processing difficulty, with reliable performance, being easy to process, facilitating batch production, and welding at both ends to ensure that the overall performance meets the usage requirements;

[0019] 5. Limited by the maximum outer diameter size of the pump body and the flow-through channel, design a sealing ring structure, which can work normally under a working pressure of 25 MPa to ensure the reliability of the outer pipe seal. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The following further describes the utility model with reference to the drawings and embodiments:

[0021] Figure 1 is the front sectional view of the overall structure of the utility model;

[0022] Figure 2 is the utility model Figure 1 in the C-C sectional view;

[0023] Figure 3 is the utility model Figure 1 in the B-B sectional view;

[0024] Figure 4 is the utility model Figure 2 in the A-A sectional view;

[0025] In the figure: double-pass sleeve 1; through hole 101; mounting hole 102; positioning conical surface 103; double-pass core 2; side hole 201; central hole 202; sealing ring 3; bevel 4; flow-through channel 5. Specific embodiments

[0026] As Figures 1 to 4 shown, a double-pass commutation device for a hydraulic-driven differential drainage and production pump includes a double-pass sleeve 1, a double-pass core 2 is fixedly arranged inside the double-pass sleeve 1, and corresponding through holes 101 and side holes 201 are arranged on both sides of the double-pass sleeve 1 and the double-pass core 2;

[0027] Flow-through channels 5 are arranged between both sides of the double-pass core 2 and the double-pass sleeve 1, and the flow-through channels 5 are communicated with the internal liquid channel in the middle of the double-pass sleeve 1;

[0028] A central hole 202 is arranged in the middle of the double-pass core 2, and the central hole 202 is communicated with the external liquid channel outside the double-pass sleeve 1 through the side hole 201 and the through hole 101.

[0029] The double-pass core 2 is installed in the double-pass sleeve 1 through a limiting structure, and the double-pass core 2 and the double-pass sleeve 1 are integrally formed by welding to ensure the working performance requirements of the whole component; the flow-through channels 5 designed between both sides of the double-pass core 2 and the double-pass sleeve 1 increase the flow-through area, enabling it to drive the liquid to commutate, the internal liquid drives the plunger assembly of the drainage and production pump to move upward, the external liquid drives the plunger assembly to move downward, reducing liquid loss, lowering the cost of drainage and gas production, and improving the working efficiency of the whole pump.

[0030] Preferably, a mounting hole 102 is arranged inside the double-pass sleeve 1, a positioning conical surface 103 is arranged at the end of the mounting hole 102, the outer side of the double-pass core 2 abuts against the inside of the mounting hole 102, and the end surface of the double-pass core 2 abuts against the positioning conical surface 103.

[0031] The double-pass core 2 is installed in the mounting hole 102, and its end abuts against the positioning conical surface 103 for installation and positioning, so that the side hole 201 is aligned with the through hole 101.

[0032] Preferably, bevels 4 are arranged at the ends of the mounting hole 102 and the double-pass core 2, and are welded and fixed at the bevels 4, thereby connecting and fixing the double-pass core 2 and the double-pass sleeve 1. Adopting welded fixed connection reduces the processing difficulty, has reliable performance, is easy to process, is convenient for batch production, and the overall performance meets the use requirements.

[0033] Preferably, the diameter of the side hole 201 is smaller than the diameter of the through hole 101, and is welded and fixed between the side hole 201 and the through hole 101, thereby connecting and fixing the double-pass core 2 and the double-pass sleeve 1.

[0034] There is a step between the side hole 201 and the through hole 101, which is convenient for welding at the step, so as to realize welded sealing and fixing.

[0035] Preferably, the end of the double-pass sleeve 1 is connected to the tubing, the outside of the double-pass sleeve 1 is hermetically connected to the outer tube of the production pump through the sealing ring 3, and the end of the double-pass core 2 is connected to the hollow sucker rod. Limited by the maximum outer diameter size of the pump body and the flow passage, the structure of the sealing ring 3 is designed to work properly under the working pressure of 25 MPa to ensure the reliability of the outer tube seal.

[0036] The above embodiments are only the preferred technical solutions of the present invention and should not be regarded as limitations on the present invention. The protection scope of the present invention should be the technical solutions recorded in the claims, including the equivalent replacement solutions of the technical features in the technical solutions recorded in the claims. That is, the equivalent replacement improvements within this scope are also within the protection scope of the present invention.

Claims

1. A two-way reversing device for a hydraulically driven differential drainage pump, characterized in that: It comprises a double-pass sleeve (1), a double-pass core (2) is fixedly arranged in the double-pass sleeve (1), and corresponding through holes (101) and side holes (201) are arranged on both sides of the double-pass sleeve (1) and the double-pass core (2); A flow passage (5) is provided between the two sides of the double-pass core (2) and the double-pass sleeve (1), and the flow passage (5) is communicated with the internal liquid passage in the middle of the double-pass sleeve (1); A central hole (202) is provided in the middle of the double-pass core (2), and the central hole (202) is connected to the external liquid channel outside the double-pass sleeve (1) through the side holes (201) and the through hole (101).

2. According to claim 1, a two-way reversing device of a hydraulically driven differential drainage pump is characterized by: A mounting hole (102) is provided in the double-pass sleeve (1), a positioning cone surface (103) is provided at the end of the mounting hole (102), the outer side of the double-pass core (2) abuts against the mounting hole (102), and the end surface of the double-pass core (2) abuts against the positioning cone surface (103).

3. According to claim 2, a two-way reversing device of a hydraulically driven differential drainage pump is characterized by: The mounting hole (102) and the end of the double-pass core (2) are both provided with grooves (4), and the grooves (4) are welded and fixed, thereby connecting and fixing the double-pass core (2) and the double-pass sleeve (1).

4. According to claim 1, a two-way reversing device of a hydraulically driven differential drainage pump is characterized by: The diameter of the side hole (201) is smaller than the diameter of the through hole (101), and the side hole (201) and the through hole (101) are welded and fixed to each other, thereby connecting and fixing the double-pass core (2) and the double-pass sleeve (1).

5. According to claim 1, a two-way reversing device of a hydraulically driven differential drainage pump is characterized by: The end of the double-pass sleeve (1) is connected to the oil pipe, the outer side of the double-pass sleeve (1) is sealed and connected to the outer pipe of the drainage pump through a sealing ring (3), and the end of the double-pass core (2) is connected to the hollow sucker rod.

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