A pump barrel assembly and a sucker rod pump

Abstract

The present invention relates to the technical field of oil extraction equipment, and discloses a pump barrel assembly and a sucker rod pump. The pump barrel assembly includes an injection gas pipe joint and a pump barrel. The injection gas pipe joint includes an injection gas pipe body and a first connection end and a second connection end connected to both ends of the injection gas pipe body. A medium injection hole is formed in the pipe wall of the injection gas pipe body. The first connection end is provided with a first sealing assembly, and the first sealing assembly is used for sealing contact with the plunger body. The second connection end is connected to the pump barrel. The first sealing assembly of the present invention can shorten the matching length between the pump barrel and the plunger body during the upward movement of the plunger body. Compared with the prior art, the upward movement distance of the plunger body is shortened, which is beneficial to reducing the working intensity of the operator.

Description

Technical Field

[0001] The present invention relates to the technical field of oil extraction equipment, and particularly to a pump barrel assembly and a sucker rod pump. Background Art

[0002] In oilfield pumping units for lifting production wells, including heavy oil wells or light oil wells, according to specific well conditions, special oil displacement processes need to be adopted. For example, in the oil displacement process of increasing the energy of the oil reservoir by injecting a medium, such as injecting high-temperature steam into a heavy oil well, or injecting hot water or CO2 gas into a light oil well. In order to carry out injection or pumping in a timely manner, various injection-production lifting tools are commonly used.

[0003] Taking the medium-hole pump as an example, the commonly used injection-production lifting tool currently has the following usage process:

[0004] Before injecting steam into the medium-hole pump, the plunger is directly lowered to the bottom of the pump, and then steam can be injected. However, when switching to the pumping state, the plunger needs to be manually lifted by 1 meter to 1.4 meters.

[0005] In summary, in the existing technology, when the commonly used injection-production lifting tool switches to the steam injection state and the pumping state, the distances of the plunger lowering and lifting are both large, and the labor intensity of the operator is high. Summary of the Invention

[0006] The purpose of the present invention is to provide a pump barrel assembly and a sucker rod pump, which can reduce the lifting distance of the plunger body when switching from the gas injection state to the pumping state, and reduce the labor intensity of the operator.

[0007] To achieve the above purpose, the present invention provides the following solutions:

[0008] A pump barrel assembly includes an injection gas pipe joint and a pump barrel; the injection gas pipe joint includes an injection gas pipe body and a first connection end and a second connection end connected to both ends of the injection gas pipe body. A medium injection hole is provided on the pipe wall of the injection gas pipe body. The first connection end is provided with a first sealing assembly for sealing contact with the plunger body, and the second connection end is connected to the pump barrel.

[0009] Preferably, the pump barrel assembly further includes a metal ring retaining joint, an extension pipe joint, and an extension pipe. 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 pipe through the extension pipe joint; a second sealing assembly is provided on the inner wall of the metal ring retaining joint near the extension pipe.

[0010] Preferably, the first sealing assembly and the second sealing assembly adopt the same sealing structure, and the sealing structure includes a support member and a sealing member; the support member is sleeved outside the sealing member.

[0011] 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 outside the short sealing ring and a part of the long sealing ring, and the short support ring is sleeved outside the other part of the long sealing ring.

[0012] 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 rings contract inward to keep the long sealing ring and the short sealing ring in contact with the plunger body to achieve sealing.

[0013] Preferably, the support member is made of corrosion-resistant alloy steel or high-temperature-resistant spring steel.

[0014] Preferably, the inner wall of the sealing member is processed by boronizing or chrome plating and then precision ground.

[0015] 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 has a clearance fit with the first groove both axially and radially; a second groove is provided inside the metal ring retaining joint, the second groove is a second annular groove, and the second sealing assembly has a clearance fit with the second groove both axially and radially.

[0016] The present invention also provides a sucker rod pump, which includes the above-mentioned pump barrel assembly and further includes a plunger assembly, and the pump barrel assembly is matched with the plunger assembly; the plunger assembly includes: 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 tungsten carbide hard alloy by spraying process, and the inner wall of the pump barrel is chrome plated.

[0017] Preferably, the sucker rod pump further includes a fixed valve assembly, the fixed valve assembly is connected to one end of the extension pipe away from the metal ring retaining joint, and the fixed valve assembly, the first traveling valve assembly and the second traveling valve assembly all include valve balls, and the matrix of the valve balls is made of carbon steel or alloy steel; the surface of the valve balls is sprayed with tungsten carbide hard alloy and precision ground.

[0018] According to the description of the above solution, the present invention discloses the following technical effects:

[0019] In the prior art, both the pump barrel and the plunger body are rigid components. During use, to reduce gas leakage and ensure pump efficiency, it is usually necessary to maintain a rigid mating length of about 1 meter between the pump barrel and the plunger body to reduce gas leakage. In the present invention, by providing a first sealing assembly on the inner wall of the first connection end of the gas injection pipe joint, an elastic seal is formed between the plunger body and the gas injection pipe joint. Compared with the sealing structure in the prior art where 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 maintain a rigid mating length of about 1 meter between the plunger body and the pump barrel, the first sealing assembly of the present invention can shorten the mating 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 reducing the working intensity of the operator. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0021] Figure 1 Full-sectional view of the pump barrel assembly provided by the embodiments of this specification;

[0022] Figure 2 Full-sectional view of the plunger assembly provided by the embodiments of this specification;

[0023] Figure 3 Provided by the embodiments of this specification Figure 1 Partial enlarged view of A therein;

[0024] Figure 4 Cross-sectional view of the C-ring provided by the embodiments of this specification;

[0025] Figure 5 Manufacturing process schematic diagram of the valve ball provided by the embodiments of this specification;

[0026] Wherein, 1 - gas 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 - extended pipe joint; 8 - extended pipe; 9 - fixed valve assembly; 10 - plunger oil outlet joint; 11 - plunger joint; 12 - plunger body; 13 - valve ball; 131 - matrix; 132 - surface of the valve ball; 14 - C-ring. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0027] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0028] As Figures 1 to 5 shown, an embodiment of this specification provides a pump barrel assembly, including an injection gas pipe joint 1 and a pump barrel 4; the injection gas pipe joint 1 includes an injection gas pipe body and a first connection end and a second connection end connected to both ends of the injection gas pipe body. A medium injection hole 3 is provided on the pipe wall of the injection gas pipe body for injecting hot water, CO2 gas, high-temperature steam, etc.; the second connection end is connected to the pump barrel 4, and a first sealing assembly 2 is arranged at the first connection end. The first sealing assembly 2 is used for sealing contact with the plunger body 12 to achieve elastic sealing between the plunger body 12 and the injection gas pipe joint 1. When the plunger assembly moves upward, mainly the upper part of the injection hole and the plunger body 12 cooperate to bear the pressure of the upper liquid column and prevent the oil from leaking from the gap between the first sealing assembly 2 and the plunger body 12. Compared with the prior art, when switching to the pumping state, the distance that the plunger body 12 needs to be manually lifted is 1 meter to 1.4 meters, and a rigid mating length of about 1 meter is maintained between the plunger body 12 and the pump barrel 4 to achieve the sealing structure. The first sealing assembly 2 of the present invention can shorten the mating length between the pump barrel 4 and the plunger body 12 during the upward lifting process of the plunger body 12. Therefore, compared with the prior art, the present invention shortens the upward lifting distance of the plunger body 12, which is beneficial to reducing the working intensity of the operator.

[0029] The pump barrel assembly further 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 arranged on the inner wall of the metal ring retaining joint 5 near the extension pipe 8. When the plunger assembly moves downward, the plunger assembly moves downward, and the oil in the pump barrel 4 below the plunger body 12 is squeezed, 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, preventing the oil in the pump barrel 4 from leaking out from the gap between the second sealing assembly 6 and the plunger body 12 and ensuring the pump efficiency; and compared with the prior art, when switching to the gas injection state, a rigid mating 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 beneficial to shortening the sealing length. Therefore, the distance for manually lowering the plunger body 12 can be reduced, and the labor intensity can be reduced.

[0030] 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.

[0031] 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.

[0032] 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.

[0033] 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.

[0034] 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.

[0035] The injection pipe joint 1 is internally provided with a first groove, the first groove is a first annular groove, the first annular groove is coaxially arranged with the injection pipe joint 1, and the length of the first annular groove is greater than the length of the first sealing assembly 2; the first sealing assembly 2 and the first groove are in clearance fit both axially and radially; the inside of the metal ring holding joint 5 is provided with a second groove, the second groove is a second annular groove, and the second sealing assembly 6 and the second groove are in clearance fit both axially and radially. The first sealing assembly 2 and the second sealing assembly 6 are arranged in a clearance fit manner, which is beneficial to reducing the friction between the first sealing assembly 2 and the second sealing assembly 6 and the plunger body 12, and is beneficial to extending the service life of the first sealing assembly 2 and the second sealing assembly 6.

[0036] The present invention also provides a sucker rod pump, which includes the above-mentioned pump barrel assembly and also includes a plunger assembly. The pump barrel assembly is matched with the plunger assembly, and the usage method is the same as that of the sucker rod pump widely used in the prior art; as Figure 2 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 a plunger oil outlet joint 10; the surface of the plunger body 12 is sprayed with tungsten carbide hard alloy by spraying process, and the inner wall of the pump barrel 4 is chrome-plated. Such a setting is beneficial to improving the wear resistance, corrosion resistance of the plunger body 12 and the adaptability with the supporting pump barrel 4, and is beneficial to extending the service life.

[0037] The sucker rod pump further includes a fixed valve assembly 9, the fixed valve assembly 9 is connected to one end of the extension pipe 8 away from the metal ring holding joint 5, and the fixed valve assembly 9, the first traveling valve assembly and the second traveling valve assembly all include a valve ball 13, as Figure 5 shown, the matrix 131 of the valve ball 13 is made of carbon steel or alloy steel; the surface 132 of the valve ball is sprayed with tungsten carbide hard alloy and precision ground. On the basis of reducing the material cost, 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 extending the normal oil production cycle.

[0038] In this specification, each embodiment is described in a progressive manner. The key point of each embodiment is to illustrate the differences from other embodiments. The same or similar parts among the embodiments can be referred to each other. For the system disclosed in the embodiments, since it corresponds to the method disclosed in the embodiments, the description is relatively simple, and the relevant parts can be referred to the description in the method part.

[0039] In this article, specific examples are used to illustrate the principles and implementation modes of the present invention. The description of the above embodiments is only used to help understand the method and its core idea of the present invention; at the same time, for those of ordinary skill in the art, according to the idea of the present invention, there will be changes in the specific implementation modes and application scopes. To sum up, the content of this specification should not be construed as a limitation on the present invention.

Claims

1. A pump barrel assembly, characterized in that, It includes an injection pipe joint and a pump barrel; the injection pipe joint includes an injection pipe body, a first connection end and a second connection end connected to both ends of the injection pipe body. A medium injection hole is provided on the pipe wall of the injection pipe body. The first connection end is provided with a first sealing assembly for sealing contact with the plunger body, and the second connection end is connected to the pump barrel; It further includes a metal ring retaining joint, an extension pipe joint and an extension pipe. 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 pipe through the extension pipe joint; a second sealing assembly is provided on the inner wall of the end of the metal ring retaining joint close to the extension pipe; The first sealing assembly and the second sealing assembly adopt the same sealing structure, and the sealing structure includes a support member and a sealing member; the support member is sleeved outside the sealing member; 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 the other part of the long sealing ring.

2. The pump barrel assembly according to claim 1, 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 cooperates with the plunger body, the C-shaped rings contract inward to keep the long sealing ring and the short sealing ring in contact with the plunger body to achieve sealing.

3. The pump barrel assembly according to claim 1, wherein, The support member is made of corrosion-resistant alloy steel or high-temperature-resistant spring steel.

4. The pump barrel assembly according to claim 1, wherein, The inner wall of the sealing member is processed by boronizing process or chrome plating process and then precision ground.

5. The pump barrel assembly according to claim 1, wherein A first groove is provided inside the injection pipe joint. The first groove is a first annular groove, and the first sealing assembly has a clearance fit with the first groove both axially and radially; a second groove is provided inside the metal ring retaining joint. The second groove is a second annular groove, and the second sealing assembly has a clearance fit with the second groove both axially and radially.

6. A sucker rod pump, characterized in that, It includes the pump barrel assembly according to any one of claims 1 to 5, and further includes a plunger assembly. The pump barrel assembly cooperates with the plunger assembly; the plunger assembly includes: a first floating valve assembly, the plunger body and a second floating valve assembly connected in sequence; the surface of the plunger body is sprayed by tungsten carbide cermet spraying process, and the inner wall of the pump barrel is chrome plated.

7. The oil pump according to claim 6, characterized in that, It further includes a fixed valve assembly. The fixed valve assembly is connected to the end of the extension pipe away from the metal ring retaining joint. The fixed valve assembly, the first floating valve assembly and the second floating valve assembly all include valve balls. The matrix of the valve ball is made of carbon steel or alloy steel; the surface of the valve ball is sprayed with tungsten carbide cermet and precision ground.

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