Pump cylinder assembly and oil well pump

Abstract

The invention relates to the technical field of oil exploitation equipment, and discloses a pump cylinder assembly and an oil well pump. The gas injection pipe connector comprises a gas injection pipe body, a first connecting end and a second connecting end, the first connecting end and the second connecting end are connected to the two ends of the gas injection pipe body, a medium injection hole is formed in the pipe wall of the gas injection pipe body, a first sealing assembly is arranged at the first connecting end and used for making sealing contact with the plunger body, and the second connecting end is connected to the pump cylinder. The first sealing assembly can shorten the matching length between the pump cylinder and the plunger body in the lifting process of the plunger body, compared with the prior art, the lifting distance of the plunger body is shortened, and the working intensity of operators can be reduced.

Description

Technical Field

[0001] The invention relates to the technical field of oil production equipment, in particular to a pump barrel assembly and an oil pump. Background Art

[0002] In oilfield pumping units, oil wells, including heavy oil wells or thin oil wells, require special oil recovery processes according to specific well conditions, such as: oil recovery processes that inject media to increase the energy of the oil layer, such as injecting high-temperature steam into heavy oil wells, and injecting hot water or CO into thin oil wells. 2 Gas, etc. In order to transfer injection or extraction in time, various injection and production lifting tools are often used.

[0003] The commonly used injection and production lifting tool currently takes the middle hole pump as an example. The use process is as follows: Before the middle hole pump is injected with steam, the plunger is directly lowered to the bottom of the pump to inject steam. However, when switching to the oil pumping state, the plunger needs to be manually lifted up by 1 to 1.4 meters.

[0004] In summary, when the injection and production lifting tools commonly used in the prior art are switched to the steam injection state and the oil extraction state, the plunger is lowered and lifted up over a long distance, and the labor intensity of the operators is high. Summary of the invention

[0005] The object of the present invention is to provide a pump barrel assembly and an oil pump, which can reduce the distance that the plunger body is lifted when changing from a gas injection state to an oil pumping state, thereby reducing the labor intensity of operators.

[0006] To achieve the above object, the present invention provides the following solutions: A pump barrel assembly includes an air injection pipe joint and a pump barrel; the air injection pipe joint includes an air injection pipe body and a first connecting end and a second connecting end connected to the two ends of the air injection pipe body, the tube wall of the air injection pipe body is provided with a medium injection hole, the first connecting end is provided with a first sealing assembly, the first sealing assembly is used for sealing contact with the plunger body, and the second connecting end is connected to the pump barrel.

[0007] Preferably, the pump barrel assembly also includes a metal ring retaining joint, an extension tube joint and an extension tube, one end of the pump barrel away from the medium injection hole is connected to one end of the metal ring retaining joint, and the other end of the metal ring retaining joint is connected to the extension tube through the extension tube joint; a second sealing assembly is provided on the inner wall of the metal ring retaining joint close to one end of the extension tube.

[0008] Preferably, the first sealing assembly and the second sealing assembly adopt the same sealing structure, and the sealing structure comprises a supporting member and a sealing member; the supporting member is sleeved on the outside of the sealing member.

[0009] Preferably, the support member includes a long support ring and a short support ring, and the sealing member includes a long sealing ring and a short sealing ring; the long support ring is sleeved on the outside of the short sealing ring and a part of the long sealing ring, and the short support ring is sleeved on the outside of another part of the long sealing ring.

[0010] Preferably, the long support ring, the short support ring, the long sealing ring and the short sealing ring are all C-shaped rings; when the pump barrel assembly is matched with the plunger body, the C-shaped ring contracts inwardly to keep the long sealing ring and the short sealing ring in contact with the plunger body to achieve sealing.

[0011] Preferably, the supporting member is made of corrosion-resistant alloy steel or high-temperature-resistant spring steel.

[0012] Preferably, the inner wall of the sealing component is processed by a boronizing process or a chrome plating process and then finely ground.

[0013] Preferably, a first groove is provided inside the gas injection pipe joint, the first groove is a first annular groove, and the first sealing assembly is clearance-matched with the first groove both in the axial direction and in the radial direction; a second groove is provided inside the metal ring retaining joint, the second groove is a second annular groove, and the second sealing assembly is clearance-matched with the second groove both in the axial direction and in the radial direction.

[0014] The present invention also provides an oil pump, comprising the above-mentioned pump barrel assembly and a plunger assembly, wherein the pump barrel assembly cooperates with the plunger assembly; the plunger assembly comprises: a first traveling valve assembly, a plunger body and a second traveling valve assembly connected in sequence; the surface of the plunger body is sprayed with a tungsten carbide cemented carbide spraying process, and the inner wall of the pump barrel is coated with a chrome plating process.

[0015] Preferably, the oil pump also includes a fixed valve assembly, which is connected to one end of the extension tube away from the metal ring retaining joint. The fixed valve assembly, the first floating valve assembly and the second floating valve assembly all include a valve ball, and the base of the valve ball is made of carbon steel or alloy steel; the surface of the valve ball is made of tungsten carbide sprayed hard alloy and finely ground.

[0016] According to the records of the above scheme, the present invention discloses the following technical effects: In the prior art, both the pump barrel and the plunger body are rigid components. During use, in order to reduce gas leakage and ensure pump efficiency, it is usually necessary to maintain a rigid fit length of about 1 meter between the pump barrel and the plunger body to reduce gas leakage. The present invention forms an elastic seal between the plunger body and the gas injection pipe joint by setting a first sealing component on the inner wall of the first connecting end of the gas injection pipe joint. Compared with the prior art, when switching from the gas injection state to the oil pumping state, it is necessary to manually lift the plunger body by 1 meter to 1.4 meters to achieve a sealing structure with a rigid fit length of about 1 meter between the plunger body and the pump barrel, the first sealing component of the present invention can shorten the fit length between the pump barrel and the plunger body during the lifting process of the plunger body. Therefore, compared with the prior art, the present invention shortens the lifting distance of the plunger body, which is beneficial to reduce the work intensity of the operator. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0018] Figure 1 A schematic diagram of a full cross-section of a pump barrel assembly provided in an embodiment of this specification; Figure 2 A full cross-sectional schematic diagram of a plunger assembly provided in an embodiment of this specification; Figure 3 The embodiments provided in this specification Figure 1 Middle A is a partial enlarged view; Figure 4 A schematic diagram of a cross section of a C-shaped ring provided in an embodiment of this specification; Figure 5 A schematic diagram of the manufacturing process of the valve ball provided in the embodiment of this specification; Among them, 1-injection pipe joint; 2-first sealing assembly; 21-long support ring; 22-short support ring; 23-long sealing ring; 24-short sealing ring; 3-medium injection hole; 4-pump barrel; 5-metal ring retaining joint; 6-second sealing assembly; 7-extension pipe joint; 8-extension pipe; 9-fixed valve assembly; 10-plunger oil outlet joint; 11-plunger joint; 12-plunger body; 13-valve ball; 131-base; 132-surface of the valve ball; 14-C-ring. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0020] like Figure 1~Figure 5 As shown, the embodiment of the present specification provides a pump barrel assembly, including an injection pipe joint 1 and a pump barrel 4; the injection pipe joint 1 includes an injection pipe body and a first connection end and a second connection end connected to both ends of the injection pipe body, and a medium injection hole 3 is opened on the wall of the injection pipe body for injecting hot water or CO 2 Gas and high-temperature steam, etc.; the second connection end is connected to the pump barrel 4, and the first connection end is provided with a first sealing component 2, which is used to seal and contact with the plunger body 12 to achieve elastic sealing between the plunger body 12 and the gas injection pipe joint 1. When the plunger assembly is in upward stroke, it is mainly the upper part of the steam injection hole and the plunger body 12 that cooperate to withstand the pressure of the upper liquid column to prevent the oil from leaking from the gap between the first sealing component 2 and the plunger body 12. Compared with the prior art, when the plunger body 12 is transferred to the oil pumping state, it is necessary to manually lift the plunger body 12 by a distance of 1 meter to 1.4 meters, so that the plunger body 12 and the pump barrel 4 maintain a rigid fitting length of about 1 meter to achieve a sealing structure, the first sealing component 2 of the present invention can shorten the fitting length between the pump barrel 4 and the plunger body 12 during the lifting process of the plunger body 12. Therefore, compared with the prior art, the present invention shortens the lifting distance of the plunger body 12, which is beneficial to reduce the work intensity of the operator.

[0021] The pump barrel assembly also includes a metal ring retaining joint 5, an extension pipe joint 7 and an extension pipe 8. One end of the pump barrel 4 away from the medium injection hole 3 is connected to one end of the metal ring retaining joint 5, and the other end of the metal ring retaining joint 5 is connected to the extension pipe 8 through the extension pipe joint 7; a second sealing assembly 6 is provided on the inner wall of one end of the metal ring retaining joint 5 close to the extension pipe 8. When the plunger assembly is in the downward stroke, the plunger assembly moves downward, and the oil in the pump barrel 4 is squeezed at the lower part of the plunger body 12, pushing open the floating valve ball 13 at the lower part of the plunger assembly and entering the upper part of the plunger body 12. At this time, the second sealing assembly 6 bears the pressure generated by the downward compression of the liquid by the plunger assembly to prevent the oil in the pump barrel 4 from leaking out from the gap between the second sealing assembly 6 and the plunger body 12, thereby ensuring the pump efficiency. Compared with the prior art, when the pump barrel 4 and the plunger body 12 are switched to the gas injection state, a rigid fitting length of about 1 meter is maintained between the pump barrel 4 and the plunger body 12 to achieve sealing. The second sealing assembly 6 forms an elastic seal, which is conducive to shortening the sealing length. Therefore, the distance for manually lowering the plunger body 12 can be reduced, thereby reducing labor intensity.

[0022] The first sealing component 2 and the second sealing component 6 adopt the same sealing structure, and the sealing structure includes a supporting member and a sealing member; the supporting member is sleeved on the outside of the sealing member to support the sealing member so that the sealing member is tightly attached to the plunger body 12, and the sealing member is used to contact the plunger body 12 to achieve sealing between the plunger body 12 and the pump barrel assembly.

[0023] In addition, the support member may also include at least one support ring, the sealing member may include at least one sealing ring, and the lengths of the sealing member and the support member are set according to actual needs. Figure 3 As shown, the supporting member includes a long supporting ring 21 and a short supporting ring 22, and the sealing member includes a long sealing ring 23 and a short sealing ring 24; the long supporting ring 21 is sleeved on the outside of the short sealing ring 24 and a part of the long sealing ring 23, and the short supporting ring 22 is sleeved on the outside of another part of the long sealing ring 23. The long supporting ring 21 and the short sealing ring 24 are arranged correspondingly, and the short supporting ring 22 and the long sealing ring 23 are arranged correspondingly, so that the gap between the long supporting ring 21 and the short supporting ring 22 can be staggered with the gap between the short sealing ring 24 and the long sealing ring 23, which is beneficial to improve the sealing effect of the entire sealing assembly. The long sealing ring 23 and the short sealing ring 24 can be obtained by simply processing the existing standard sealing ring parts to reduce costs; or sealing rings of appropriate lengths can be customized.

[0024] like Figure 4 As shown, the long support ring 21, the short support ring 22, the long sealing ring 23 and the short sealing ring 24 are all C-shaped rings 14; when the pump barrel assembly is matched with the plunger assembly, since the long sealing ring 23 and the short sealing ring 24 themselves are elastic, the short support ring 22 and the long support ring 21 are arranged outside the long sealing ring 23 and the short sealing ring 24, and the short support ring 22 and the long support ring 21 themselves are rigid. When the plunger assembly passes through the sealing assembly, the long sealing ring 23 and the short sealing ring 24 are radially stretched apart, and the rigid short support ring 22 and the long support ring 21 limit the radial outward expansion of the long sealing ring 23 and the short sealing ring 24, squeeze the long sealing ring 23 and the short sealing ring 24, so that the long sealing ring 23 and the short sealing ring 24 keep in contact with the plunger assembly, thereby improving the sealing effect and ensuring the pump efficiency. The C-ring 14 can be obtained by processing an O-ring / circular ring. The processing method includes: processing a groove or cutout parallel to the axis, or an oblique cutout or groove on the O-ring / circular ring.

[0025] The support member is preferably made of corrosion-resistant alloy steel or high-temperature-resistant spring steel. The support member can also be made of other materials according to the actual well conditions.

[0026] The inner wall of the sealing component is processed by boronizing or chrome plating and then finely ground. This arrangement is beneficial to improving the wear resistance, hardness and corrosion resistance of the sealing component, thereby helping to extend the service life of the sealing component.

[0027] A first groove is provided inside the gas injection pipe joint 1, and the first groove is a first annular groove, which is coaxially arranged with the gas injection pipe joint 1, and the length of the first annular groove is greater than the length of the first sealing component 2; the first sealing component 2 and the first groove are clearance-matched in both the axial and radial directions; a second groove is provided inside the metal ring retaining joint 5, and the second groove is a second annular groove, and the second sealing component 6 is clearance-matched in both the axial and radial directions. The first sealing component 2 and the second sealing component 6 are set in a clearance-matching manner, which is conducive to reducing the friction between the first sealing component 2 and the second sealing component 6 and the plunger body 12, and is conducive to extending the service life of the first sealing component 2 and the second sealing component 6.

[0028] The present invention also provides an oil well pump, comprising the above-mentioned pump barrel assembly and a plunger assembly, the pump barrel assembly and the plunger assembly cooperate with each other, and the method of use is the same as the method of use of the oil well pump widely used in the prior art; Figure 2 As shown, the plunger assembly includes: a first traveling valve assembly, a plunger body 12 and a second traveling valve assembly connected in sequence; one end of the first traveling valve assembly is connected to the plunger body 12 through a plunger joint 11, and the other end is connected to the plunger oil outlet joint 10; the surface of the plunger body 12 is sprayed with tungsten carbide hard alloy spraying technology, and the inner wall of the pump barrel 4 is chrome-plated. This arrangement is conducive to improving the wear resistance and corrosion resistance of the plunger body 12 and the adaptability to the matching pump barrel 4, which is conducive to extending the service life.

[0029] The oil pump further comprises a fixed valve assembly 9, which is connected to an end of the extension pipe 8 away from the metal ring holding joint 5. The fixed valve assembly 9, the first traveling valve assembly and the second traveling valve assembly all comprise a valve ball 13. Figure 5 As shown, the base 131 of the valve ball 13 is made of carbon steel or alloy steel; the surface 132 of the valve ball is made of tungsten carbide sprayed hard alloy and finely ground. On the basis of reducing material costs, the surface hardness and corrosion resistance of the valve ball 13 are improved, the replacement cycle of the valve ball 13 is extended, and thus it is beneficial to extend the normal oil production cycle.

[0030] In this specification, each embodiment is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the embodiments can be referred to each other. For the system disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the method part.

[0031] The principles and implementation methods of the present invention are described in this article using specific examples. The description of the above embodiments is only used to help understand the method and core idea of ​​the present invention. At the same time, for those skilled in the art, according to the idea of ​​the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A pump barrel assembly, characterized in that: It includes an air injection pipe joint and a pump barrel; the air injection pipe joint includes an air injection pipe body and a first connecting end and a second connecting end connected to both ends of the air injection pipe body, a tube wall of the air injection pipe body is provided with a medium injection hole, the first connecting end is provided with a first sealing assembly, the first sealing assembly is used for sealing contact with the plunger body, and the second connecting end is connected to the pump barrel.

2. The pump barrel assembly according to claim 1, characterized in that: It also includes a metal ring retaining joint, an extension tube joint and an extension tube. The end of the pump barrel away from the medium injection hole is connected to one end of the metal ring retaining joint, and the other end of the metal ring retaining joint is connected to the extension tube through the extension tube joint; a second sealing assembly is provided on the inner wall of the metal ring retaining joint close to one end of the extension tube.

3. The pump barrel assembly according to claim 2, characterized in that: The first sealing assembly and the second sealing assembly adopt the same sealing structure, and the sealing structure includes a supporting member and a sealing member; the supporting member is sleeved outside the sealing member.

4. The pump barrel assembly according to claim 3, characterized in that: The support member includes a long support ring and a short support ring, and the sealing member includes a long sealing ring and a short sealing ring; the long support ring is sleeved outside the short sealing ring and a part of the long sealing ring, and the short support ring is sleeved outside another part of the long sealing ring.

5. The pump barrel assembly according to claim 4, characterized in that: The long support ring, the short support ring, the long sealing ring and the short sealing ring are all C-shaped rings; when the pump barrel assembly is matched with the plunger body, the C-shaped ring contracts inwardly to keep the long sealing ring and the short sealing ring in contact with the plunger body to achieve sealing.

6. The pump barrel assembly according to claim 3, characterized in that: The supporting member is made of corrosion-resistant alloy steel or high-temperature-resistant spring steel.

7. The pump barrel assembly according to claim 3, characterized in that: The inner wall of the sealing component is processed by boronizing process or chrome plating process and then finely ground.

8. The pump barrel assembly according to claim 2, characterized in that: A first groove is arranged inside the gas injection pipe joint, and the first groove is a first annular groove, and the first sealing assembly is loosely matched with the first groove in both axial and radial directions; a second groove is arranged inside the metal ring retaining joint, and the second groove is a second annular groove, and the second sealing assembly is loosely matched with the second groove in both axial and radial directions.

9. A well pump, characterized in that: It comprises the pump barrel assembly as described in any one of claims 2 to 8, and also comprises a plunger assembly, wherein the pump barrel assembly cooperates with the plunger assembly; the plunger assembly comprises: a first traveling valve assembly, the plunger body and a second traveling valve assembly connected in sequence; the surface of the plunger body is sprayed with a tungsten carbide cemented carbide spraying process, and the inner wall of the pump barrel is coated with a chrome plating process.

10. The oil well pump according to claim 9, characterized in that: It also includes a fixed valve assembly, which is connected to one end of the extension tube away from the metal ring retaining joint. The fixed valve assembly, the first floating valve assembly and the second floating valve assembly all include a valve ball, and the base of the valve ball is made of carbon steel or alloy steel; the surface of the valve ball is made of tungsten carbide sprayed hard alloy and finely ground.

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