CN105735945A - Oil pumping device - Google Patents

Abstract

The invention provides an oil pumping device which comprises a wellhead joint, an oil pumping rod piece and a flashboard polished rod sealing device, wherein the oil pumping rod piece penetrates through the wellhead joint and the flashboard polished rod sealing device; the oil pumping rod piece comprises an oil pumping polished rod, a working rod and an oil pumping rod which are sequentially connected from top to bottom; the oil pumping device also comprises: one end of the working nipple is hermetically connected with the wellhead joint, the other end of the working nipple is hermetically connected with the flashboard polish rod sealing device, and the working nipple is sleeved on the outer side of the oil pumping rod piece; wherein, the sucker rod is connected through the work plunger with the work pole, and the outside of work plunger is installed the sealing washer with the hole looks adaptation of work nipple joint. The oil pumping device has the advantages of simple structure, reasonable design and reliable work, and can realize the replacement of the polished rod and the flashboard polished rod sealing device under pressure, thereby improving the safety and the construction efficiency of underground operation, reducing the labor intensity and saving a large amount of production cost.

Description

oil rig

technical field

The invention relates to the field of oil exploitation, in particular to an oil pumping device.

Background technique

At present, the development of heavy oil and ultra-heavy oil is being carried out on a large scale, mainly including steam huff and puff, SAGD ultra-heavy oil recovery, and fire flooding. In the early stage, cycle preheating or steam huff and puff are used, and in the later stage, the production mainly relies on mechanical oil recovery. Oil pumping rod is an important part of mechanical oil recovery.

However, with the continuous maturity and popularization and application of thermal recovery technology, the wear problem of oil pumping rods is also increasingly exposed. At present, the replacement of the oil pumping rod for each well can only be implemented by the workover measures. The workover operation is not only expensive, but also requires well killing operations, which will damage the formed gas cavity and formation communication, which is not conducive to the development of heavy oil thermal recovery technology. .

Contents of the invention

The main purpose of the present invention is to provide an oil pumping device to solve the problem that the method for replacing the oil sucking polished rod in the prior art is relatively difficult.

In order to achieve the above object, the present invention provides an oil pumping device, comprising a wellhead joint, a sucker rod and a ram polished rod sealing device, the sucker rod is installed in the wellhead joint and the ram polished rod sealing device; The components include the oil pumping polished rod, the working rod and the sucker rod which are connected up and down in sequence; the oil pumping device also includes: a working sub, one end of the working sub is sealed and connected with the wellhead joint, and the other end of the working sub is connected with the ram polished rod sealing device Sealed connection, and the working nipple is sleeved on the outside of the sucker rod; wherein, the sucker rod and the working rod are connected through the working plunger, and the outer side of the working plunger is installed with a sealing ring that matches the inner hole of the working nipple .

Furthermore, both ends of the working sub-joint are provided with connecting flanges, and the working sub-joint is connected with the wellhead joint and the sealing device of the flash rod through the connecting flanges.

Further, the wellhead joint is a three-way joint, and a pressure gate is installed on the interface of the three-way joint away from the sucker rod.

Further, a grease injection port is provided on the working nipple, and a grease injection valve is installed on the grease injection port.

Further, multiple grease injection ports are arranged on the working short joint, and the multiple grease injection ports are arranged along the circumferential direction of the working short joint.

Further, the working plunger is provided with a grease receiving groove corresponding to the grease injection port.

Further, the grease filling groove of the oil pumping device is an annular groove arranged along the circumference of the working plunger.

Further, a packing box is installed on the end of the ram polished rod sealing device away from the wellhead joint, and the packing box is sleeved on the outside of the sucker rod.

Further, the packing box is provided with a threaded flange, and the packing box is connected to the sealing device of the gate polished rod through the threaded flange.

Further, a packing box pressing cap is installed on the oil sucking rod, and the packing box pressing cap is pressed on the side of the packing box away from the wellhead joint.

The oil pumping device in the present invention includes a working sub-section, which is arranged between the wellhead joint and the ram polished rod sealing device, the sucker rod and the working rod are connected through the working plunger, and the outer side of the working plunger is installed with A sealing ring that matches the inner hole of the working pup joint. In this way, when it is necessary to replace the oil pumping rod or the sealing device of the gate polished rod, the oil pumping rod can be pulled to make the working plunger enter into the working sub-joint, and then the sealing ring can seal the inner hole of the working sub-joint, so that Replace the oil pump polished rod or ram polished rod sealing device under pressure.

The oil pumping device of the present invention is simple in structure, reasonable in design, reliable in operation, and can realize the replacement of the polished rod and the polished rod sealing device of the gate under pressure, thereby improving the safety and construction efficiency of underground operations, reducing labor intensity and saving energy. A large amount of production cost provides equipment support for the well control process of heavy oil thermal recovery wells, and has a good field application prospect.

Description of drawings

The accompanying drawings constituting a part of the present application are used to provide a further understanding of the present invention, and the schematic embodiments and descriptions of the present invention are used to explain the present invention, and do not constitute an improper limitation of the present invention. In the attached picture:

Fig. 1 shows a schematic structural view of the oil pumping device of the present invention.

Wherein, the above-mentioned accompanying drawings include the following reference signs:

10. Wellhead joint; 20. Sucker rod;

21. Sucker rod; 22. Oil sucker rod;

23. Working rod; 30. Sealing device for flash rod;

40. Working short joint; 41. Connecting flange;

50. Working plunger;

51. Sealing ring; 52. Grease injection holding tank;

61. Pressure gate; 62. Grease injection valve;

70. Packing box; 71. Threaded flange;

80. Packing box pressure cap; 91. Connecting bolts;

92. Polished rod coupling; 93. Seal.

detailed description

It should be noted that, in the case of no conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and examples.

It should be pointed out that the following detailed description is exemplary and intended to provide further explanation to the present application. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.

It should be noted that the terminology used here is only for describing specific implementations, and is not intended to limit the exemplary implementations according to the present application.

As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should also be understood that when the terms "comprising" and/or "comprising" are used in this specification, it indicates There are features, steps, operations, means, components and/or combinations thereof.

The present invention provides an oil pumping device, please refer to FIG. 1, the oil pumping device includes a wellhead joint 10, a sucker rod 20 and a flash rod sealing device 30, and the sucker rod 20 is installed on the wellhead joint 10 and the gate In the polished rod sealing device 30; the sucker rod member 20 includes a polished sucker rod 22, a working rod 23 and a sucker rod 21 connected up and down in sequence; The joint 10 is sealed and connected, and the other end of the working nipple 40 is sealed and connected with the ram polished rod sealing device 30, and the working nipple 40 is sleeved on the outside of the sucker rod 20; wherein, the sucker rod 21 and the working rod 23 pass through the working The plunger 50 is connected, and the outer side of the working plunger 50 is installed with a sealing ring 51 suitable for the inner hole of the working sub-joint 40 .

The oil pumping device in the present invention includes a working short joint 40, which is arranged between the wellhead joint 10 and the flash rod sealing device 30, the sucker rod 21 and the working rod 23 are connected by the working plunger 50, and the working The outer side of the plunger 50 is installed with a sealing ring 51 suitable for the inner hole of the working nipple 40 . In this way, when it is necessary to replace the oil pumping rod 22 or the gate polished rod sealing device 30, the oil pumping rod 22 can be pulled to make the working plunger 50 enter the working sub-joint 40, and then the sealing ring 51 is aligned with the inner part of the working sub-joint 40. The holes are sealed, so that the oil sucking polished rod 22 or the gate polished rod sealing device 30 can be replaced under pressure.

The oil pumping device of the present invention is simple in structure, reasonable in design, and reliable in operation, and can realize the replacement of the polished rod and the polished rod sealing device 30 of the gate under pressure, thereby improving the safety and construction efficiency of underground operations, and reducing labor intensity at the same time. It saves a lot of production costs, provides equipment support for the well control process of heavy oil thermal recovery wells, and has a good field application prospect.

Preferably, connecting flanges 41 are provided at both ends of the working sub-joint 40 , and the working sub-joint 40 is connected with the wellhead joint 10 and the flash rod sealing device 30 through the connecting flanges 41 .

In this application, by providing the connecting flange 41 , the working pup joint 40 can be connected with the wellhead joint 10 and the flash rod sealing device 30 more conveniently.

Preferably, the wellhead joint 10 is a three-way joint, and a pressure gate 61 is installed on the interface of the three-way joint away from the sucker rod 20 .

In this application, by setting the pressing gate 61, the sealing performance of the oil pumping device can be more conveniently tested when parts are replaced.

Preferably, a grease injection port is provided on the working short joint 40, and a grease injection valve 62 is installed on the grease injection port.

In this application, by setting the grease injection valve 62, grease can be injected between the working nipple 40 and the working plunger 50, thereby improving the sealing performance of the oil pumping device when parts are replaced.

On-site installation is carried out according to the installation instructions. The device is designed with a grease injection valve 62, which can be injected with high-temperature medium for sealing. The working pup joint 40 and the working plunger 50 are used for sealing. The gate polished rod sealing device 30 is closed and sealed, and the grease injection valve 62 is injected with grease The sealing structure plays the role of multi-stage sealing; and the upper packing box 70 can be replaced by closing the gate polished rod sealing device 30, which improves the efficiency and safety of the operation.

Preferably, the grease injection valve 62 is a high temperature grease injection ball valve, which can inject high temperature medium to seal the polished rod.

Preferably, multiple grease injection ports are provided on the working short joint 40 , and the multiple grease injection ports are arranged along the circumferential direction of the working short joint 40 .

Preferably, the working plunger 50 is provided with a grease receiving groove 52 corresponding to the grease injection port.

Preferably, the grease injection receiving groove 52 of the oil pumping device is an annular groove arranged along the circumferential direction of the working plunger 50 .

In the present application, by setting the grease injection receiving groove 52, it is relatively convenient to inject grease between the working nipple 40 and the working plunger 50, thereby improving the sealing performance of the oil pumping device.

Preferably, a packing box 70 is installed on the end of the polished rod sealing device 30 away from the wellhead joint 10 , and the packing box 70 is sleeved on the outside of the sucker rod 20 .

By setting the packing box 70 so that it is sheathed on the sucker rod member 20, the oil pumping device can be effectively sealed.

Preferably, the packing box 70 is provided with a threaded flange 71 , and the packing box 70 is connected to the gate polished rod sealing device 30 through the threaded flange 71 .

In this application, the packing box 70 can be conveniently connected with the gate polished rod sealing device 30 by setting the threaded flange 71 .

Preferably, a packing box pressing cap 80 is installed on the polished oil rod 22 , and the packing box pressing cap 80 is pressed on the side of the packing box 70 away from the wellhead joint 10 .

In this application, the packing box 70 can be fixed more conveniently by setting the packing box pressing cap 80 .

Preferably, the working rod 23 is connected to the oil pumping polished rod 22 through a polished rod collar 92 .

Preferably, the ram polished rod sealing device is a single ram polished rod sealing device.

Preferably, the oil pumping device includes connecting bolts 91 , and the threaded flange 71 is connected to the sealing device 30 of the flash rod through the connecting bolts 91 . In this application, the connections between adjacent flanges are all connected by connecting bolts 91 .

Preferably, a seal 93 is installed between the connected flanges. Preferably, the sealing member 93 is a steel ring.

According to the needs of on-site production, this application simplifies the operation process as much as possible, conducts research on the process of replacing polished rods under pressure in thermal recovery wells, and designs an oil pumping device suitable for the process of replacing polished rods under pressure.

The device is mainly composed of oil pumping polished rod 22, packing box 70, threaded flange 71, gate polished rod sealing device 30, polished rod coupling 92, working rod 23, grease injection valve 62, working nipple 40, and working plunger 50 , high-temperature sealing ring (sealing ring 51) and other component groups, etc., provide equipment support for the later operation of replacing the oil pumping polished rod under pressure, realize the purpose of replacing the worn polished rod under pressure during the ultra-heavy oil production process, and improve the downhole The safety of the operation and the construction efficiency are improved, while the labor intensity is reduced, and a large amount of production costs are saved.

The application of the process of replacing the oil pumping polished rod under pressure in the thermal recovery well is mainly to realize the replacement of the worn out oil pumping polished rod under pressure in the process of super heavy oil production. Provide necessary equipment and technical support.

The oil pumping device involved in this application involves the oil pumping polished rod replacement process under pressure in thermal recovery wells. Rod 23, grease injection valve 62, working nipple 40, working plunger 50, high-temperature sealing ring (sealing ring 51) and other component groups.

In this application, by lifting the polished rod 22 upwards, the polished rod collar 92 enters the lower chamber of the packing box 70. At this time, the working plunger 50 moves upwards and enters the inner hole of the working nipple 40 to achieve a first-level seal. Packing box 70, replace the oil pumping polished rod 22; after the primary seal fails, the rubber gate of the gate polished rod sealing device 30 can be closed to realize the secondary sealing to replace the polished rod; the grease injection valve 62 can realize the sealing of the polished rod sealing device under pressure replacement Plastic core. Simultaneously, the seal in the upper packing box can be replaced by closing the single gate polished rod sealing device in normal production.

The process of the present invention solves the requirement of under-pressure replacement for polished rod wear in heavy oil thermal recovery wells, and the involved device adopts multi-stage and different sealing structures to realize the under-pressure replacement of polished rods. It has simple structure, reasonable design, and reliable operation. The production well control technology provides equipment support and has a good field application prospect.

Utilize the oil pumping device in the application to replace the implementation steps of the oil pumping polished rod 22:

(1) Lift up the polished rod 22 until the polished rod collar 92 enters the lower end of the packing box 70. At this time, the working plunger 50 cooperates with the working nipple 40 to form a seal;

(2) loosen the packing box pressure cap 80 on the upper end of the oil pumping rod 22;

(3) pressurize from the bypass of the tee joint, and check the seal of the working plunger 50;

(4) If the seal is qualified, disassemble the threaded flange 71 of the packing box 70, install the polished rod slips, and perform the operation of replacing the polished rod;

(5) If the seal of the working plunger 50 is unqualified, close the single gate polished rod sealing device, and check the sealing device, and if the seal is qualified, replace the polished rod according to step (4);

(6) If the seal of the polished rod sealing device of the single gate fails, perform grease injection and sealing through the grease injection valve 62, and at the same time perform seal inspection, and if the seal is qualified, replace the rubber core of the polished rod sealing device of the single gate until the single gate The polished rod sealing device of the plate is qualified, and the polished rod 22 is replaced according to step (4).

The single-gate polished rod sealing device of the present invention involves multi-stage sealing, including the gap seal between the working plunger 50 and the inner hole of the working nipple 40, the high-temperature sealing ring seal, the grease injection valve grease injection seal, and the gate seal, etc. .

The application process involved in the present invention is implemented by multi-level sealing. The second-level packing box can realize the dynamic sealing of the polished rod and the replacement of the upper packing; the gap sealing, O-ring sealing and single gate sealing of the lower working plunger 50 The replacement of the upper oil pumping polished rod 22 can be realized, and the upper packing can also be replaced at the same time; the grease injection seal of the grease injection valve 62 can realize the replacement of the sealing rubber core of the single gate polished rod sealing device.

Now, exemplary embodiments according to the present application will be described in more detail with reference to the accompanying drawings.

These example embodiments may, however, be embodied in many different forms and should not be construed as limited to only the embodiments set forth herein.

It should be understood that these embodiments are provided so that this disclosure will be thorough and complete and will fully convey the concept of these exemplary embodiments to those of ordinary skill in the art. In the drawings, the layers are exaggerated for clarity and the thickness of the region, and the same reference numerals are used to designate the same devices, and thus their descriptions will be omitted.

Embodiment one:

The present embodiment provides a kind of oil pumping device, please refer to Fig. 1, this oil pumping device comprises wellhead joint 10, sucker rod part 20 and ram polished rod sealing device 30, and sucker rod part 20 is installed in wellhead joint 10 and In the flash rod sealing device 30; the sucker rod part 20 includes the oil sucker rod 22, the working rod 23 and the sucker rod 21 connected up and down in sequence; the oil pumping device also includes: a working sub 40, one end of the working sub 40 and The wellhead joint 10 is sealed and connected, and the other end of the working nipple 40 is sealed and connected with the ram polished rod sealing device 30, and the working nipple 40 is sleeved on the outside of the sucker rod 20; wherein, the sucker rod 21 and the working rod 23 pass through The working plunger 50 is connected, and the outer side of the working plunger 50 is installed with a sealing ring 51 that is compatible with the inner hole of the working nipple 40; wherein, the wellhead joint 10 is a tee joint, and the tee joint is far away from the sucker rod 20 Pressure gate 61 is installed on the interface.

The oil pumping device in this embodiment includes a working short joint 40, which is arranged between the wellhead joint 10 and the flash rod sealing device 30, the sucker rod 21 and the working rod 23 are connected through the working plunger 50, and The outer side of the working plunger 50 is installed with a sealing ring 51 matching with the inner hole of the working short joint 40 . In this way, when it is necessary to replace the oil pumping rod 22 or the gate polished rod sealing device 30, the oil pumping rod 22 can be pulled to make the working plunger 50 enter the working sub-joint 40, and then the sealing ring 51 is aligned with the inner part of the working sub-joint 40. The holes are sealed, so that the oil sucking polished rod 22 or the gate polished rod sealing device 30 can be replaced under pressure.

The oil pumping device in this embodiment has a simple structure, reasonable design, and reliable operation, and can realize the replacement of the polished rod and the polished rod sealing device 30 of the gate under pressure, thereby improving the safety and construction efficiency of underground operations, and reducing labor intensity at the same time , save a lot of production costs, provide equipment support for the well control process of heavy oil thermal recovery wells, and have a good field application prospect.

In this embodiment, connecting flanges 41 are provided at both ends of the working sub-joint 40 , and the working sub-joint 40 is connected to the wellhead joint 10 and the ram polished rod sealing device 30 through the connecting flanges 41 .

In this application, by providing the connecting flange 41 , the working pup joint 40 can be connected with the wellhead joint 10 and the flash rod sealing device 30 more conveniently.

In this application, by setting the pressing gate 61, the sealing performance of the oil pumping device can be more conveniently tested when parts are replaced.

In this embodiment, a grease injection port is provided on the working short joint 40, and a grease injection valve 62 is installed on the grease injection port.

In this application, by setting the grease injection valve 62, grease can be injected between the working nipple 40 and the working plunger 50, thereby improving the sealing performance of the oil pumping device when parts are replaced.

On-site installation is carried out according to the installation instructions. The device is designed with a grease injection valve 62, which can be injected with high-temperature medium for sealing. The working pup joint 40 and the working plunger 50 are used for sealing. The gate polished rod sealing device 30 is closed and sealed, and the grease injection valve 62 is injected with grease The sealing structure plays the role of multi-stage sealing; and the upper packing box 70 can be replaced by closing the gate polished rod sealing device 30, which improves the efficiency and safety of the operation.

In this embodiment, the grease injection valve 62 is a high temperature grease injection ball valve, which can inject high temperature medium to seal the polished rod.

In this embodiment, multiple grease injection ports are provided on the working short joint 40 , and the multiple grease injection ports are arranged along the circumferential direction of the working short joint 40 .

In this embodiment, the working plunger 50 is provided with a grease receiving groove 52 corresponding to the grease injection port.

In this embodiment, the grease injection receiving groove 52 of the oil pumping device is an annular groove arranged along the circumferential direction of the working plunger 50 .

In the present application, by setting the grease injection receiving groove 52, it is relatively convenient to inject grease between the working nipple 40 and the working plunger 50, thereby improving the sealing performance of the oil pumping device.

In this embodiment, a packing box 70 is installed on the end of the ram polished rod sealing device 30 away from the wellhead joint 10 , and the packing box 70 is sleeved on the outside of the sucker rod member 20 .

By setting the packing box 70 so that it is sheathed on the sucker rod member 20, the oil pumping device can be effectively sealed.

In this embodiment, the packing box 70 is provided with a threaded flange 71 , and the packing box 70 is connected to the gate polished rod sealing device 30 through the threaded flange 71 .

In this application, the packing box 70 can be conveniently connected with the gate polished rod sealing device 30 by setting the threaded flange 71 .

In this embodiment, a packing box pressing cap 80 is installed on the oil sucking rod 22 , and the packing box pressing cap 80 is pressed on the side of the packing box 70 away from the wellhead joint 10 .

In this application, the packing box 70 can be fixed more conveniently by setting the packing box pressing cap 80 .

In this embodiment, the working rod 23 is connected to the oil pumping polished rod 22 through a polished rod collar 92 .

In this embodiment, the polished rod sealing device of the ram is a polished rod sealing device of a single ram.

In this embodiment, the oil pumping device includes connecting bolts 91 , and the threaded flange 71 is connected to the sealing device 30 of the flash rod through the connecting bolts 91 . In this application, the connections between adjacent flanges are all connected by connecting bolts 91 .

In this embodiment, a seal 93 is installed between the connected flanges. In this embodiment, the sealing member 93 is a steel ring.

According to the needs of on-site production, this application simplifies the operation process as much as possible, conducts research on the process of replacing polished rods under pressure in thermal recovery wells, and designs an oil pumping device suitable for the process of replacing polished rods under pressure.

From the above description, it can be seen that the above-mentioned embodiments of the present invention have achieved the following technical effects:

The oil pumping device in the present invention includes a working short joint 40, which is arranged between the wellhead joint 10 and the flash rod sealing device 30, the sucker rod 21 and the working rod 23 are connected by the working plunger 50, and the working The outer side of the plunger 50 is installed with a sealing ring 51 suitable for the inner hole of the working nipple 40 . In this way, when it is necessary to replace the oil pumping rod 22 or the gate polished rod sealing device 30, the oil pumping rod 22 can be pulled to make the working plunger 50 enter the working sub-joint 40, and then the sealing ring 51 is aligned with the inner part of the working sub-joint 40. The holes are sealed, so that the oil sucking polished rod 22 or the gate polished rod sealing device 30 can be replaced under pressure.

The oil pumping device of the present invention is simple in structure, reasonable in design, and reliable in operation, and can realize the replacement of the polished rod and the polished rod sealing device 30 of the gate under pressure, thereby improving the safety and construction efficiency of underground operations, and reducing labor intensity at the same time. It saves a lot of production costs, provides equipment support for the well control process of heavy oil thermal recovery wells, and has a good field application prospect.

It should be noted that the terms "first" and "second" in the description and claims of the present application and the above drawings are used to distinguish similar objects, but not necessarily used to describe a specific sequence or sequence.

It is to be understood that the data so used are interchangeable under appropriate circumstances such that the embodiments of the application described herein, for example, can be practiced in sequences other than those illustrated or described herein.

Furthermore, the terms "comprising" and "having", as well as any variations thereof, are intended to cover a non-exclusive inclusion, for example, a process, method, system, product or device comprising a sequence of steps or elements is not necessarily limited to the expressly listed instead, may include other steps or elements not explicitly listed or inherent to the process, method, product or apparatus.

For the convenience of description, spatially relative terms may be used here, such as "on ...", "over ...", "on the surface of ...", "above", etc., to describe the The spatial positional relationship between one device or feature shown and other devices or features.

It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures.

For example, if the device in the figures is turned over, devices described as "above" or "above" other devices or configurations would then be oriented "beneath" or "above" the other devices or configurations. under other devices or configurations". Thus, the exemplary term "above" can encompass both an orientation of "above" and "beneath".

The device may be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptions used herein interpreted accordingly.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and changes. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims (10)

1. An oil pumping device, comprising a wellhead joint (10), a sucker rod (20) and a ram polished rod sealing device (30), and the sucker rod (20) is passed through the wellhead joint (10) ) and the ram polished rod sealing device (30); the sucker rod (20) includes a polished sucker rod (22), a working rod (23) and a sucker rod (21) connected up and down in sequence; its features In that, the oil pumping device also includes: A working short joint (40), one end of the working short joint (40) is sealingly connected with the wellhead joint (10), and the other end of the working short joint (40) is connected with the sealing device (30) of the polished rod of the gate Sealed connection, and the working nipple (40) is sleeved on the outside of the sucker rod (20); Wherein, the sucker rod (21) and the working rod (23) are connected through a working plunger (50), and the outer side of the working plunger (50) is installed with the working nipple (40). The sealing ring (51) that inner hole matches. 2. The oil pumping device according to claim 1, characterized in that, both ends of the working nipple (40) are provided with connecting flanges (41), and the working nipple (40) is connected through the The flange (41) is connected with the wellhead joint (10) and the ram polished rod sealing device (30). 3. The oil pumping device according to claim 1, characterized in that, the wellhead joint (10) is a three-way joint, and the interface of the three-way joint far away from the sucker rod (20) is installed There is a pressing gate (61). 4. The oil pumping device according to claim 1, characterized in that a grease injection port is provided on the working nipple (40), and a grease injection valve (62) is installed on the grease injection port. 5. The oil pumping device according to claim 4, characterized in that a plurality of grease injection ports are provided on the working sub-joint (40), and the plurality of grease injection ports are arranged along the working sub-joint Circumferential setting of (40). 6. The oil pumping device according to claim 4, characterized in that, the working plunger (50) is provided with a grease injection receiving groove (52) corresponding to the grease injection port. 7. The oil pumping device according to claim 5, characterized in that the grease injection receiving groove (52) of the oil pumping device is an annular groove arranged along the circumference of the working plunger (50). 8. The oil pumping device according to claim 1, characterized in that a packing box (70) is installed at the end of the polished rod sealing device (30) of the ram (30) away from the wellhead joint (10), and the The packing box (70) is sleeved on the outside of the sucker rod (20). 9. The oil pumping device according to claim 8, characterized in that, the packing box (70) is provided with a threaded flange (71), and the packing box (70) passes through the threaded The flange (71) is connected with the sealing device (30) of the gate polished rod. 10. The oil pumping device according to claim 8, characterized in that, a packing box pressing cap (80) is installed on the oil pumping polished rod (22), and the packing box pressing cap (80) is pressed on the The side of the packing box (70) away from the wellhead joint (10).