Structure of anti-piercing pull oil pump

Abstract

The utility model belongs to the technical field of oil well pump, concretely is a kind of anti-perforation pull oil pump structure, including pump barrel assembly, hollow pull tube and plunger assembly, the inside sliding connection of hollow pull tube and pump barrel assembly, the top fixed connection of plunger assembly and hollow pull tube, the inner bottom fixed connection of pump barrel assembly has fixed valve assembly.The utility model is provided with hollow pipe, plunger upper valve cover can extend pump barrel, plunger upper valve cover of small pump can also increase outer diameter, strengthen strength, reduce the occurrence of valve cover fracture;By changing the solid oil pumping rod connected to the upper end of plunger into hollow pipe, since the bending strength of pipe material is higher than the bending strength of bar material, it is not easy to bend, avoids the problem of eccentric wear due to the upper connecting oil pumping rod of plunger.

Description

Technical Field

[0001] This utility model relates to the field of oil pump technology, and in particular to a perforation-resistant pull-out oil pump structure. Background Technology

[0002] In the process of extracting oil from the formation, mechanical equipment is used to lift crude oil from the well to the surface, and the oil pump is the main oil production equipment. An oil pump is a special type of reciprocating pump. Power is transmitted from the surface to the well via the sucker rod, causing the plunger of the oil pump to move up and down reciprocally, lifting the crude oil from the well along the tubing to the surface. As the depth of the oil well increases, the stroke of the oil pump also becomes longer. It should be explained that one stroke is one up-and-down movement of the plunger within the pump casing. To achieve an ultra-long stroke, a long pump casing structure is required.

[0003] Currently, long-stroke oil pumps are being used more and more. However, long-stroke oil pumps, especially small-diameter long-stroke oil pumps, sometimes experience problems with the sucker rod bending and uneven wear during the lower stroke. On the one hand, uneven wear of the sucker rod can cause it to break; on the other hand, the worn sucker rod can scratch the pump barrel like a knife, causing damage to the pump barrel and resulting in well collapse, making it impossible to produce oil. Utility Model Content

[0004] The purpose of this invention is to solve the problem mentioned in the background art that sometimes the sucker rod bends and wears unevenly during the lower stroke of a small-diameter long-stroke oil pump, and to propose an anti-perforation oil pump structure.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A perforation-resistant pull-out oil pump structure includes a pump barrel assembly, a hollow pull tube, and a plunger assembly. The hollow pull tube is slidably connected to the inside of the pump barrel assembly, the plunger assembly is fixedly connected to the top of the hollow pull tube, and a fixed valve assembly is fixedly connected to the inner bottom of the pump barrel assembly.

[0007] Preferably, the top and bottom of the pump assembly are both threaded with sleeves.

[0008] Preferably, the plunger assembly is threaded to the top of the hollow tube, and the plunger assembly is slidably connected to the inner wall of the sleeve.

[0009] Preferably, the fixed valve assembly is threaded into the pump cylinder assembly.

[0010] Preferably, the outer diameter of the hollow tube is smaller than the outer diameter of the plunger.

[0011] Compared with the prior art, the present invention has the following beneficial effects:

[0012] 1. In this utility model, the solid sucker rod connected to the upper end of the plunger is replaced with a hollow tube. Since the bending strength of the tube material is higher than that of the bar material, it is not easy to bend, thus avoiding the problem of uneven wear caused by the sucker rod connected to the plunger.

[0013] 2. In this utility model, by setting a hollow tube, the upper valve cover of the plunger can extend out of the pump barrel, and the outer diameter of the upper valve cover of the plunger of the small pump can also be increased to strengthen the strength and reduce the occurrence of valve cover breakage. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of an anti-perforation pull-out oil pump proposed in this utility model.

[0015] In the diagram: 1. Pump cylinder assembly, 2. Hollow tubing, 3. Piston assembly, 4. Fixed valve assembly, 5. Sleeve. Detailed Implementation

[0016] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0017] Reference Figure 1 A perforation-resistant pull-out oil pump structure includes a pump barrel assembly 1, a hollow pull tube 2, and a plunger assembly 3. The hollow pull tube 2 is internally slidably connected to the pump barrel assembly 1, and the outer diameter of the hollow pull tube 2 is smaller than the outer diameter of the plunger.

[0018] In this embodiment, the top and bottom of the pump cylinder assembly 1 are threaded with sleeves 5 to facilitate connection with external structures. The plunger assembly 3 is fixedly connected to the top of the hollow pull tube 2, and the plunger assembly 3 is threadedly connected to the top of the hollow pull tube 2 to facilitate disassembly and fixation of the plunger assembly 3.

[0019] In this embodiment, the plunger assembly 3 is slidably connected to the inner wall of the sleeve 5, and the inner bottom of the pump barrel assembly 1 is fixedly connected to the fixed valve assembly 4, which is threadedly inserted into the pump barrel assembly 1.

[0020] In this embodiment, the solid sucker rod connected to the upper end of the plunger is replaced with a hollow tube. Since the bending strength of the tube material is higher than that of the bar material, it is not easy to bend, thus avoiding the problem of uneven wear caused by the sucker rod connected to the plunger.

[0021] In this embodiment, by setting a hollow tube, the upper valve cover of the plunger can extend out of the pump barrel, and the outer diameter of the upper valve cover of the plunger of the small pump can also be increased to strengthen its strength and reduce the occurrence of valve cover breakage.

[0022] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A perforation-resistant pull-out oil pump structure, comprising a pump barrel assembly (1), a hollow pull tube (2), and a plunger assembly (3), characterized in that: The hollow tube (2) is slidably connected to the inside of the pump barrel assembly (1), the plunger assembly (3) is fixedly connected to the top of the hollow tube (2), and the fixed valve assembly (4) is fixedly connected to the bottom of the pump barrel assembly (1).

2. The anti-perforation pull-out oil pump structure according to claim 1, characterized in that: The top and bottom of the pump cylinder assembly (1) are both threaded with sleeves (5).

3. The anti-perforation pull-out oil pump structure according to claim 2, characterized in that: The plunger assembly (3) is threaded to the top of the hollow tube (2), and the plunger assembly (3) is slidably connected to the inner wall of the sleeve (5).

4. The anti-perforation pull-out oil pump structure according to claim 1, characterized in that: The fixed valve assembly (4) is threaded into the pump cylinder assembly (1).

5. The anti-perforation pull-out oil pump structure according to claim 1, characterized in that: The outer diameter of the hollow tube (2) is smaller than the outer diameter of the plunger.

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