Self-lubricating assembly and wellhead packing box device with same
The self-lubricating component addresses wear and leakage issues in oil extraction by automating lubrication, ensuring consistent lubrication and enhancing safety and automation in oil field operations.
Patent Information
- Application Number
- CN202510516212.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-23
- Publication Date
- 2025-07-15
- Estimated Expiration
- Not applicable · inactive patent
AI Technical Summary
In the prior art, the wellhead pack box is prone to radial swing when it is reciprocating up and down the bar, causing wear of the seal, increasing the risk of wellhead leakage, and manual lubricating oil has safety risks and does not meet the requirements of the intelligent well site.
A self-lubricating component is designed to drive the first welding plate to move back and forth through a linear displacement mechanism, automatically add lubricating oil to the pressure cap, and use the wellhead pressure differential air deflation device and elastic parts to realize the partition and inflow of lubricating oil, reducing the wear of the sealing member by the movement of the bar.
It realizes automatic lubrication during the movement of the bar, reduces seal wear, avoids wellhead leakage, and meets the intelligent needs of the well site.
Smart Images
Figure CN120312970A_ABST
Abstract
Description
Technical Field
[0001] The present invention belongs to the technical field of oil extraction, and particularly relates to a self-lubricating component and a stuffing box device for a wellhead with such a component. Background Art
[0002] Currently, when extracting crude oil in oilfield mines, reciprocating rod pumping equipment is generally used. The polished rod reciprocates up and down in the pumping well to pump the crude oil out of the ground. Among them, a stuffing box for the wellhead is installed on the wellhead of the pumping well. The stuffing box for the wellhead includes components such as a packing main body, a sealing packing, a sealing block, a compression cap, and a tightening mechanism. The sealing packing and the sealing block are arranged in the packing main body. When the polished rod passes through the packing main body, it is in close contact with the sealing packing and the sealing block respectively. The compression cap is arranged on the top of the packing main body to compress the sealing packing, and the tightening mechanism is arranged on one side of the packing main body to abut against the sealing block, and the wellhead is sealed by the sealing packing and the sealing block. In the normal state of this stuffing box for the wellhead, it can meet the requirements of on-site pumping operations. However, in actual use, when the polished rod reciprocates up and down, it is prone to radial yaw, and the polished rod will cause irregular wear of the sealing packing and the sealing block of the stuffing box for the wellhead, thereby increasing the risk of wellhead leakage.
[0003] Currently, in the prior art, in order to avoid leakage at the wellhead, lubricating oil is often manually added to the polished rod for lubrication to reduce the wear of the sealing packing and the sealing block caused by the reciprocating movement of the polished rod. However, it is easy to be dangerous when manually adding lubricating oil, which does not meet the requirements of intelligent and unmanned operation in the well site. Summary of the Invention
[0004] In view of this, the present invention provides a self-lubricating component and a stuffing box device for a wellhead with such a component, so as to solve the deficiencies in the prior art. The present invention can automatically add lubricating oil to the compression cap to lubricate the polished rod, and reduce the wear of the sealing parts in the stuffing box for the wellhead when the polished rod moves.
[0005] The technical solution of the present invention is: a self-lubricating component configured to be connected to a stuffing box for a wellhead and used to inject lubricating oil into the stuffing box for the wellhead. The self-lubricating component includes a cylinder body fixed on the compression cap of the stuffing box for the wellhead. One end of the cylinder body is communicated with the inside of the compression cap. A fixed nut is fixed in the cylinder body. An oil inlet and outlet box body is fixed at one end of the fixed nut close to the compression cap. An oil inlet hole is opened on one side of the oil inlet and outlet box body close to the fixed nut. The oil inlet hole is communicated with an oil storage tank through a pipeline. An oil outlet hole is opened on the other side of the oil inlet and outlet box body. The oil outlet hole is communicated with the inside of the cylinder body. A first welding plate is arranged in the oil inlet and outlet box body and abuts against its inner wall. The first welding plate is located between the oil inlet hole and the oil outlet hole. A linear displacement mechanism is arranged in the cylinder body. The output end of the linear displacement mechanism is connected to the first welding plate to drive the first welding plate to reciprocate. When the oil inlet hole and the oil outlet hole are on the same side of the first welding plate, the oil inlet hole and the oil outlet hole are communicated.
[0006] Preferably, the linear displacement mechanism includes a fixed seat handle and a power unit. The fixed seat handle is inserted through a fixed nut and is slidably connected to the fixed nut along the center line direction thereof. One end of the fixed seat handle is fixedly connected to a first welding plate, and the power unit is arranged in the cylinder body and is connected to the other end of the fixed seat handle to drive the fixed seat handle to reciprocate.
[0007] Preferably, the power unit includes a gas transmission element, a second welding plate, and an elastic member. The second welding plate is arranged in the cylinder body and abuts against its inner wall. The second welding plate is located on the side of the fixed nut away from the oil inlet and outlet box body. The other end of the fixed seat handle is fixedly connected to the second welding plate. The elastic member is arranged between the first welding plate and the inner wall of the oil inlet and outlet box body and abuts against them respectively. The gas transmission element is communicated with the opening of the counterbore through a pipeline.
[0008] Preferably, the gas transmission element adopts a wellhead differential pressure gas release device.
[0009] Preferably, first sealing rings are sleeved outside the first welding plate, the second welding plate, and the fixed nut respectively.
[0010] Preferably, the cylinder body is arranged obliquely downward, and the storage oil tank is arranged vertically downward on the cylinder body and is detachably and fixedly connected to the cylinder body.
[0011] A wellhead stuffing box device includes a wellhead stuffing box and also includes a self-lubricating component.
[0012] Preferably, a corrugated hose is vertically arranged at the bottom of the packing main body of the wellhead stuffing box. One end of the corrugated hose is connected to the bottom port of the packing main body, and the other end is connected to the wellhead of the pumping well.
[0013] Preferably, the corrugated hose is made of rubber.
[0014] Preferably, upper and lower joints are coaxially fixed at the upper and lower ends of the corrugated hose respectively. The ends of the upper and lower joints away from each other are detachably and fixedly connected to the bottom port of the packing main body and the wellhead of the pumping well respectively.
[0015] Compared with the prior art, a self-lubricating component and a wellhead stuffing box device with the component provided by the present invention can, by the cooperation of the cylinder body with the fixed nut, the oil inlet and outlet box body, the first welding plate, and the linear displacement mechanism, drive the first welding plate to reciprocate by the linear displacement mechanism when the polished rod of the oil production equipment moves up and down, so as to cut off or communicate the oil inlet hole and the oil outlet hole of the oil inlet and outlet box body. After the lubricating oil in the storage oil tank flows into the oil inlet and outlet box body through the oil inlet hole, it flows into the cylinder body through the oil outlet hole, and finally is introduced into the gland of the wellhead stuffing box through the cylinder body, thereby realizing automatically adding lubricating oil to the gland to lubricate the polished rod, reducing the wear of the sealing member in the wellhead stuffing box when the polished rod moves, and further avoiding the leakage at the wellhead. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] Figure 1 It is a schematic diagram of the internal structure of the self-lubricating component of the present invention; Figure 2 It is a cross-sectional view of the fixed seat handle of the present invention; Figure 3 It is a schematic diagram of the working state of the self-lubricating component of the present invention; Figure 4 It is a schematic diagram of the structure of the wellhead stuffing box device of the present invention; Figure 5 It is a schematic diagram of the deformation of the corrugated hose of the present invention. Specific embodiments
[0017] The present invention provides a self-lubricating component and a wellhead stuffing box device having the component. The following is a description of the present invention in conjunction with Figures 1 to 5 the schematic diagram of the structure.
[0018] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the technical solutions of the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.
[0019] Figure 1 This is a schematic diagram of the internal structure of the self-lubricating component of this embodiment. As Figure 1As shown in the figure, a self-lubricating component is configured to be connected to the stuffing box of the wellhead for injecting lubricating oil into the stuffing box of the wellhead. The self-lubricating component 3 includes a cylinder body 31 fixedly arranged on the gland 1 of the stuffing box of the wellhead. One end of the cylinder body 31 is communicated with the inside of the gland 1. A fixed nut 32 is fixedly arranged in the cylinder body 31 to seal the side of the cylinder body 31 away from the gland 1. The oil inlet and outlet box body 37 is fixedly arranged at one end of the fixed nut 32 close to the gland 1. An oil inlet hole 371 is opened on one side of the oil inlet and outlet box body 37 close to the fixed nut 32. The oil inlet hole 371 is communicated with an oil storage tank 38 through a pipeline. An oil outlet hole 372 is opened on the other side of the oil inlet and outlet box body 37. The oil outlet hole 372 is communicated with the inside of the cylinder body 31. A first welding plate 341 is arranged in the oil inlet and outlet box body 37 and abuts against its inner wall. The first welding plate 341 is located between the oil inlet hole 371 and the oil outlet hole 372 to cut off the communication between the oil inlet hole 371 and the oil outlet hole 372. A linear displacement mechanism is arranged in the cylinder body 31. The output end of the linear displacement mechanism is connected to the first welding plate 341 to drive the first welding plate 341 to move reciprocally. When the oil inlet hole 371 and the oil outlet hole 372 are on the same side of the first welding plate 341, the oil inlet hole 371 and the oil outlet hole 372 are communicated with each other.
[0020] In this embodiment, the cylinder body 31 of the self-lubricating component is communicated with the inside of the cylinder body 31 of the stuffing box of the wellhead. After the oil storage tank 38 is communicated with the oil inlet hole 371 of the oil inlet and outlet box body 37, the lubricating oil flows into the oil inlet and outlet box body 37 from the oil inlet hole 371. At the same time, since the first welding plate 341 is located between the oil inlet hole 371 and the oil outlet hole 372, the lubricating oil in the oil inlet and outlet box body 37 cannot flow out from the oil outlet hole 372. The linear displacement mechanism is used to drive the first welding plate 34 to move. When the oil inlet hole 371 and the oil outlet hole 372 are on the same side of the first welding plate 34, the lubricating oil in the oil inlet and outlet box body 37 flows out through the oil outlet hole 372 and flows into the gland 1 through the cylinder body 31 to lubricate the polished rod, reducing the wear of the sealing parts in the stuffing box of the wellhead when the polished rod moves. After a certain amount of lubricating oil flows into the gland 1, the linear displacement mechanism is used to drive the first welding plate 34 to move in the opposite direction. When the first welding plate 341 is located between the oil inlet hole 371 and the oil outlet hole 372, the lubricating oil in the oil inlet and outlet box body 37 cannot flow out from the oil outlet hole 372. The reciprocating movement of the first welding plate 34 can automatically add lubricating oil to the gland to lubricate the polished rod.
[0021] Figure 2 It is a cross-sectional view of the fixed seat handle of this embodiment, as Figure 2As shown, as a further optimization scheme, a specific structure of a linear displacement mechanism is provided in this embodiment, and the linear displacement mechanism includes: a fixed seat handle 34 and a power unit, the fixed seat handle 34 is passed through the fixed nut 32, and the fixed seat handle 34 is slidably connected to the fixed nut 32 along the center line direction, one end of the fixed seat handle 34 is fixedly connected to the first welding plate 341, the power unit is arranged in the cylinder 31, and the power unit is connected to the other end of the fixed seat handle 34 to drive the fixed seat handle 34 to move back and forth.
[0022] In this embodiment, the first welding plate 341 is driven to move by the cooperation of the fixed seat handle 34 and the power unit, so that the first welding plate 341 can move stably and the stability of lubricating oil injection is improved.
[0023] In this embodiment, after the fixed seat handle 34 is inserted into the fixed nut 32 and the first welding plate 341 is welded to one end of the fixed seat handle 34, the oil inlet and outlet box body 37 is installed on the end of the fixed nut 32 close to the first welding plate 341, the fixed nut 32 is connected to the cylinder 31 through threads, and then the cylinder 31 is connected to the pressure cap 1 by welding.
[0024] As a further optimization scheme, the power unit in this embodiment includes: an air delivery element, a second welding plate 342 and an elastic member 36. The second welding plate 342 is arranged in the cylinder 31 and abuts against its inner wall. The second welding plate 342 is located on the side of the fixing nut 32 away from the oil inlet and outlet box body 37. The second welding plate 342 and the first welding plate 341 are parallel to each other. The other end of the fixed seat handle 34 is fixedly connected to the second welding plate 342. The elastic member 36 is arranged between the first welding plate 341 and the inner wall of the oil inlet and outlet box body 37 and abuts against them respectively. The air delivery element is connected to the mouth of the countersunk hole through a pipeline.
[0025] In this embodiment, a second welding plate 342 is provided at the other end of the fixed seat handle 34, and gas is injected into the fixed nut 32 by means of a gas transmission element, so as to push the second welding plate 342 to move in the fixed nut 32 toward the side close to the oil inlet and outlet box body 37, thereby making the fixed seat handle 34 drive the first welding plate 341 to move. After the injection of lubricating oil is completed, the gas injected into the fixed nut 32 is released, and then the elastic member 36 is used to drive the first welding plate 341, the fixed seat handle 34 and the second welding plate 342 to return to their original positions, thereby realizing the reciprocating movement of the first welding plate 341, the fixed seat handle 34 and the second welding plate 342.
[0026] The elastic member 36 in this embodiment is a compression spring, which is installed in the oil inlet and outlet box body 37 and then connects the oil inlet and outlet box body 37 and the fixing nut 32 .
[0027] In this embodiment, a counterbore may also be provided on the side of the fixed nut 32 away from the oil inlet and outlet housing 37, and the second welding plate 342 is disposed in the counterbore and abuts against its inner wall.
[0028] As a further optimization solution, in this embodiment, the gas transmission element adopts a wellhead differential pressure gas release device.
[0029] Figure 3 This is a schematic diagram of the working state of the self-lubricating component in this embodiment. As Figure 3 shown, the left end of the fixed nut 32 in this embodiment is connected to the wellhead differential pressure gas release device through a pipeline. When the gas injected into the fixed nut 32 by the wellhead differential pressure gas release device reaches a certain pressure, the gas pushes the second welding plate 342 to move in the fixed nut 32 toward the side close to the oil inlet and outlet housing 37. When the oil inlet hole 371 and the oil outlet hole 372 are on the same side of the first welding plate 34 (after the first welding plate 34 moves to the preset position), the lubricating oil flows out from the oil outlet hole 372, flows into the compression nut 1 through the cylinder body 31, and the lubricating oil flows toward the polished rod under the action of gravity to complete the lubrication of the polished rod. When the wellhead differential pressure gas release device no longer injects gas into the fixed nut 32 and the gas in the fixed nut 32 is released, the elastic member 36 pushes the first welding plate 34 back to its original position, and the lubricating oil cannot flow out from the oil outlet hole 372. By repeating the above process, the lubricating oil can be automatically added to the compression nut to lubricate the polished rod, reducing the wear of the sealing member in the wellhead stuffing box during the movement of the polished rod. In this embodiment, the wellhead differential pressure gas release device and the elastic member 36 are used to realize the reciprocating movement of the fixed seat rod 34 and the first welding plate 341, and lubricating oil is filled into the cavity of the compression nut 1.
[0030] In this embodiment, an air pipe joint 33 is fixedly provided at one end of the fixed nut 32 away from the oil box body 37, and the air pipe joint 33 is detachably and fixedly connected to the pipeline.
[0031] In this embodiment, the air pipe joint 33 is provided on the fixed nut 32 to facilitate the connection between the pipeline and the fixed nut 32, and the air pipe joint 33 is fixed to the fixed nut 32 by welding.
[0032] As a further optimization solution, in this embodiment, first sealing rings 35 are respectively sleeved on the outer sides of the first welding plate 341, the second welding plate 342 and the fixed nut 32.
[0033] In this embodiment, first sealing rings 35 are provided on the first welding plate 341, the second welding plate 342 and the fixed nut 32. The first sealing rings 35 are installed on the outer circumferential surfaces of the first welding plate 341 and the second welding plate 342, and the first sealing rings 35 abut against the inner wall of the fixed nut 32. The first sealing rings 35 on the fixed nut 32 are located between the fixed nut 32 and the cylinder body 31 and abut against them respectively.
[0034] As a further optimization solution, in this embodiment, the cylinder body 31 is inclined downward, and the oil storage tank 38 is vertically downwardly arranged on the cylinder body 31 and is detachably and fixedly connected to the cylinder body 31.
[0035] In this embodiment, the outer side of the mouth of the oil storage tank 38 is detachably and fixedly connected to the cylinder body 31 through threads, and the mouth of the oil storage tank 38 is communicated with the oil inlet hole 371 on the oil inlet and outlet box body 37 through a pipeline.
[0036] Figure 4 It is a structural schematic diagram of the stuffing box device at the wellhead of this embodiment. As Figure 4 shown, a stuffing box device at the wellhead includes a stuffing box at the wellhead and also includes a self-lubricating component 3.
[0037] In this embodiment, the compression cap 1 of the stuffing box device at the wellhead is installed on the packing main body 8 through threads, and the handle 2 is installed on the compression cap 1 through threads. By means of the handle, the compression cap 1 can be screwed downwards to tightly press the packing compression cap 4 installed inside the packing main body 8. The packing compression cap 4 and the compression spring 7 cooperate to tightly press the sealing packing 5 to ensure the oil circuit seal. The second sealing ring 6 is sleeved at the connection between the packing main body 8 and the compression cap 1. The sealing block 11 and the tightening slider 13 are respectively installed on the left and right sides of the packing main body 8. The sealing block 11 abuts against the polished rod. The side of the first fixing nut 16 assists in fixing the tightening slider 13 to prevent it from falling. A third sealing ring 9 is arranged on the tightening slider 13, and the third sealing ring 9 abuts against the inner wall of the packing main body 8. Installation plates are respectively arranged on the outer sides of the tightening slider 13. The installation plates are fixedly connected to the packing main body 8 through the second fixing nut 10 and the third fixing nut 15. A tightening rod 12 is horizontally arranged on the installation plate and is in threaded cooperation with it. By screwing the tightening rod 12, the tightening slider 13 can be tightly pressed, indirectly pressing the sealing block 11 to complete the seal, and at the same time avoiding the occurrence of hard friction phenomena and reducing damage to the sealing structure.
[0038] In this embodiment, a circlip 14 is sleeved inside the installation plate where the tightening rod 12 is located, so as to ensure the stability of the extrusion of the tightening slider 13 by the tightening rod 12.
[0039] As a further optimization solution, in this embodiment, a corrugated hose 18 is vertically arranged at the bottom of the packing main body 8 of the stuffing box at the wellhead. One end of the corrugated hose 18 is connected to the bottom port of the packing main body 8, and the other end is connected to the wellhead of the oil production well.
[0040] Figure 5 It is a schematic diagram of the deformation of the corrugated hose in this embodiment. As Figure 5As shown, in this embodiment, the wellhead of the oil pumping well is connected to the bottom port of the packing main body 8 through a corrugated hose 18. When the polished rod moves up and down and undergoes radial yaw, the corrugated hose 18 deforms under force, but the center of the wellhead packing box and the center of the polished rod are always coaxial. The corrugated hose 18 replaces the deformation to protect the seals (sealing packing, sealing blocks) in the wellhead packing box from irregular wear caused by the yaw of the polished rod. The corrugated hose 18 can minimize the phenomenon of eccentric wear of the seals during the movement of the polished rod and extend the service life of the seals.
[0041] As a further optimization scheme, in this embodiment, the material of the corrugated hose 18 is rubber.
[0042] In this embodiment, the corrugated hose 18 made of rubber improves the service life of the corrugated hose 18.
[0043] As a further optimization scheme, in this embodiment, an upper joint 17 and a lower joint 19 are coaxially fixed to the upper end and the lower end of the corrugated hose 18 respectively. The ends of the upper joint 17 and the lower joint 19 away from each other are detachably and fixedly connected to the bottom port of the packing main body 8 and the wellhead of the oil pumping well respectively.
[0044] The above-disclosed are only the preferred specific embodiments of the present invention. However, the embodiments of the present invention are not limited thereto, and any changes that can be thought of by those skilled in the art should fall within the protection scope of the present invention.
Claims
1. A self-lubricating component configured to be connected to a wellhead stuffing box and used for injecting lubricating oil into the wellhead stuffing box, characterized in that, The self-lubricating assembly (3) includes: A cylinder body (31) fixedly arranged on the gland (1) of the wellhead stuffing box. One end of the cylinder body (31) is communicated with the inside of the gland (1), and a fixed nut (32) is fixedly arranged in the cylinder body (31); An oil inlet and outlet box body (37) fixedly arranged at one end of the fixed nut (32) close to the gland (1). An oil inlet hole (371) is arranged on one side of the oil inlet and outlet box body (37) close to the fixed nut (32). The oil inlet hole (371) is communicated with an oil storage tank (38) through a pipeline. An oil outlet hole (372) is arranged on the other side of the oil inlet and outlet box body (37). The oil outlet hole (372) is communicated with the inside of the cylinder body (31). A first welding plate (341) is arranged in the oil inlet and outlet box body (37) and abuts against its inner wall. The first welding plate (341) is located between the oil inlet hole (371) and the oil outlet hole (372); A linear displacement mechanism arranged in the cylinder body (31). The output end of the linear displacement mechanism is connected to the first welding plate (341) to drive the first welding plate (341) to reciprocate. When the oil inlet hole (371) and the oil outlet hole (372) are on the same side of the first welding plate (341), the oil inlet hole (371) is communicated with the oil outlet hole (372).
2. The self-lubricating component according to claim 1, wherein The linear displacement mechanism includes: a fixed seat handle (34) and a power part. The fixed seat handle (34) is penetrated through the fixed nut (32). The fixed seat handle (34) is slidably connected to the fixed nut (32) along the central line direction of the fixed nut (32). One end of the fixed seat handle (34) is fixedly connected to the first welding plate (341). The power part is arranged in the cylinder body (31), and the power part is connected to the other end of the fixed seat handle (34) to drive the fixed seat handle (34) to reciprocate.
3. The self-lubricating component according to claim 2, characterized in that, The power part includes: a gas transmission element, a second welding plate (342) and an elastic part (36). The second welding plate (342) is arranged in the cylinder body (31) and abuts against its inner wall. The second welding plate (342) is located on the side of the fixed nut (32) far from the oil inlet and outlet box body (37). The other end of the fixed seat handle (34) is fixedly connected to the second welding plate (342). The elastic part (36) is arranged between the first welding plate (341) and the inner wall of the oil inlet and outlet box body (37) and abuts against them respectively. The gas transmission element is communicated with the orifice of the counterbore through a pipeline.
4. The self-lubricating assembly according to claim 3, wherein The gas transmission element adopts a wellhead differential pressure air release device.
5. The self-lubricating component according to claim 3, characterized in that First sealing rings (35) are respectively sleeved on the outer sides of the first welding plate (341), the second welding plate (342) and the fixed nut (32).
6. The self-lubricating component according to claim 1, characterized in that, The cylinder body (31) is arranged obliquely downward. The oil storage tank (38) is arranged vertically downward on the cylinder body (31) and is detachably and fixedly connected to the cylinder body (31).
7. A stuffing box device for a wellhead, comprising: A wellhead stuffing box, characterized in that it further includes the self-lubricating assembly (3) as described in any one of claims 1-6.
8. The stuffing box device for wellhead according to claim 7, wherein, At the bottom of the packing main body (8) of the wellhead stuffing box, a corrugated hose (18) is vertically arranged. One end of the corrugated hose (18) is connected to the bottom port of the packing main body (8), and the other end is connected to the wellhead of the pumping well.
9. The stuffing box device for wellhead according to claim 8, wherein, The corrugated hose (18) is made of rubber.
10. The stuffing box device for wellhead according to claim 8, characterized in that, The upper end and the lower end of the corrugated hose (18) are coaxially and fixedly provided with an upper joint (17) and a lower joint (19). The ends of the upper joint (17) and the lower joint (19) away from each other are respectively detachably and fixedly connected to the bottom port of the packing main body (8) and the wellhead of the oil production well.