Wellhead sealing device adopting deviation-following and follow-up polish rod for wear reduction

Abstract

The invention relates to the field of wellhead sealing, in particular to a wellhead sealing device adopting deviation following type polish rod abrasion reduction, which comprises a cylinder, a sealing assembly is arranged outside the cylinder, a fixing assembly is arranged on the surface of the sealing assembly, a fastening assembly is arranged on the surface of the fixing assembly, and a connecting assembly is arranged at the lower end of the sealing assembly. The sealing assembly comprises two sleeves, two sealing rings provide a two-layer sealing effect, crude oil in a fixed wellhead is prevented from being sprayed out, when the sucker rod transversely shifts due to external pressure, the sealing rings can be displaced and deformed through the space in the sleeves, the sealing rings and the sucker rod are stably connected in a sleeved mode by filling oil liquid, and the sealing effect of the sucker rod is improved. Therefore, the position of the sealing ring can be adjusted along with the deviation of the sucker rod, the sucker rod is prevented from causing excessive friction to the sealing ring in the deviation process, the service life of the sealing ring is greatly prolonged, the frequency of shutdown maintenance of the oil pumping unit is reduced, and the production efficiency of the oil pumping unit is greatly improved.

Description

Technical Field

[0001] The invention relates to the field of wellhead sealing, in particular to a wellhead sealing device adopting a deflection-following polished rod wear reduction device. Background Art

[0002] In oil production engineering, oil pumping is the most common oil production process. When the oil pumping unit is working, it is necessary to seal the pumping rod that is constantly moving up and down at the wellhead to prevent the liquid in the well from flowing out from around the pumping rod and polluting the environment. In order to achieve the purpose of sealing the pumping rod, a sealing box needs to be set at the wellhead, and a sealing member for sealing the pumping rod is set in the sealing box.

[0003] In the prior art, annular packing is usually used as a seal in a sealing box. When the packing is worn, the sealing box needs to be opened to replace the new packing. In actual use, the position of the sucker rod is constantly offset, which will cause the packing to be squeezed and worn in a single direction, so the packing needs to be replaced frequently. Replacing the packing requires stopping production and stopping the machine, so replacing the packing will affect normal production efficiency. Summary of the invention

[0004] In view of the problems in the prior art, the present invention provides a wellhead sealing device which adopts a deviation-following type polished rod wear reduction device.

[0005] The technical solution adopted by the present invention to solve the technical problem is: a wellhead sealing device adopting a follow-up type polished rod wear reduction device, comprising a cylinder, a sealing component is arranged on the outside of the cylinder, a fixing component is arranged on the surface of the sealing component, a fastening component is arranged on the surface of the fixing component, and a connecting component is arranged at the lower end of the sealing component; The sealing assembly includes two sleeves, the two sleeves are symmetrically sleeved on the outer walls at both ends of the cylinder, the interiors of the two sleeves are clamped with extrusion rings, the two sleeves and the two extrusion rings are clamped with sealing rings, the interiors of the two sealing rings are plugged with the same sucker rod, the outer walls of the two sleeves are fixedly connected with L-shaped tubes, the outer walls of the other ends of the two L-shaped tubes are sleeved with sealing sleeves, an externally threaded tube is clamped between the two L-shaped tubes, the outer walls of the externally threaded tubes are threadedly connected with threaded cylinders at both ends, the outer wall of the externally threaded tubes is fixedly connected with a control valve at the center of the outer wall, and the outer wall of the externally threaded tube is fixedly connected with a pressure gauge.

[0006] Specifically, the fixing assembly includes four round blocks, and the four round blocks are symmetrically fixedly connected to the outer walls of the two sleeves. The surfaces of the four round blocks are provided with grooves, and the insides of the four grooves are clamped with clamping rings. Two steel cables are fixedly connected to the surfaces of the four clamping rings respectively, and a fixing block is embedded on the surface at the center of the two steel cables, and the side walls of the two fixing blocks are provided with conical grooves.

[0007] Specifically, the fastening assembly includes four rings, and the four rings are fixedly sleeved on the surfaces of two steel cables. Two arc blocks are respectively embedded on the outer walls of the four rings. Threaded holes are opened at the centers of the inner walls of the two arc blocks. The insides of the two threaded holes are threadedly connected with threaded rods, and the other ends of the two threaded rods are fixedly connected with rotating blocks. Plug holes are opened on the surfaces of the two rotating blocks, and plug plates are inserted into the insides of the two plug holes. Slots are opened on the outer walls of the two arc blocks.

[0008] Specifically, the connecting assembly includes a fixed cylinder, which is fixedly connected to the bottom of the sleeve located at the lower end of the cylinder. Two card interfaces are symmetrically opened on the outer wall of the lower end of the fixed cylinder. Arc-shaped card blocks are fixedly connected to the inner walls of the two card interfaces. Card blocks are clamped inside the two arc-shaped card blocks. Two fixing caps are movably sleeved on the outer walls of the two arc-shaped card blocks and the two card blocks, and the same fixed wellhead is fixedly connected between the two card blocks.

[0009] Specifically, the threaded tube is sleeved on the outer wall of the sealing sleeve, and the sealing sleeve is clamped between the L-shaped tube and the external threaded tube.

[0010] Specifically, the four clamping grooves are arranged on one side surface of four round blocks which are away from each other, and the diameter length of the round blocks is the same as the inner diameter length of the clamping ring.

[0011] Specifically, the two inserting plates correspond to the two slots, and the two threaded rods correspond to the two conical grooves.

[0012] Specifically, the outer walls of the arc-shaped clamping block and the clamping block match the inner wall of the fixing cap.

[0013] Beneficial effects of the present invention: The wellhead sealing device for reducing wear of a smooth rod using a deviation-following type described in the present invention provides a two-layer sealing effect through two sealing rings to prevent crude oil in a fixed wellhead from spraying out. When the sucker rod is laterally deflected by external pressure, the space inside the sleeve allows the sealing ring to be displaced and deformed. However, due to the presence of filling oil, the sealing ring and the sucker rod are stably sleeved, which allows the sealing ring to adjust its position as the sucker rod deflects, preventing the sucker rod from causing excessive friction to the sealing ring during the deflection process, greatly increasing the service life of the sealing ring, reducing the frequency of shutdowns for maintenance of the pumping unit, and greatly improving the production efficiency of the pumping unit. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0015] Figure 1A schematic diagram of the structure of a wellhead sealing device for reducing wear of a polished rod using a deviation-following type provided by the present invention; Figure 2 A schematic cross-sectional structure diagram of a wellhead sealing device for reducing wear of a polished rod using a deflection-following type provided by the present invention; Figure 3 A schematic diagram of the structure of a connection assembly of a wellhead sealing device using a deflection-following polished rod wear reduction method provided by the present invention; Figure 4 A schematic diagram of the structure of a fixing assembly of a wellhead sealing device using a deflection-following polished rod wear reduction method provided by the present invention; Figure 5 A schematic diagram of the sleeve structure of a wellhead sealing device using a deflection-following polished rod wear reduction method provided by the present invention; Figure 6 A schematic diagram of a fixed wellhead structure of a wellhead sealing device using a deflection-following polished rod wear reduction method provided by the present invention; Figure 7 A schematic diagram of the fixed cylinder structure of a wellhead sealing device for reducing wear of a polished rod using a deviation-following type provided by the present invention.

[0016] In the figure: 1. Cylinder; 2. Sealing assembly; 21. Sleeve; 22. Sealing ring; 23. Extrusion ring; 24. Sucker rod; 25. L-shaped tube; 26. Sealing sleeve; 27. Externally threaded tube; 28. Threaded barrel; 29. ​​Control valve; 210. Pressure gauge; 3. Fixing assembly; 31. Round block; 32. Slot; 33. Snap ring; 34. Steel cable; 35. Fixing block; 36. Conical groove; 4. Fastening assembly; 41. Sleeve ring; 42. Arc block; 43. Threaded hole; 44. Threaded rod; 45. Rotating block; 46. Socket; 47. Insert plate; 48. Slot; 5. Connecting assembly; 51. Fixing barrel; 52. Card interface; 53. Arc-shaped card block; 54. Card connection block; 55. Fixing cap; 56. Fixing wellhead. DETAILED DESCRIPTION

[0017] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below in conjunction with specific implementation methods.

[0018] like Figure 1-Figure 7 As shown, a wellhead sealing device adopting a deflection-following polished rod wear reduction according to the present invention comprises a cylinder 1, a sealing component 2 is arranged on the outside of the cylinder 1, a fixing component 3 is arranged on the surface of the sealing component 2, a fastening component 4 is arranged on the surface of the fixing component 3, and a connecting component 5 is arranged at the lower end of the sealing component 2; The sealing assembly 2 includes two sleeves 21, which are symmetrically sleeved on the outer walls at both ends of the cylinder 1. Extrusion rings 23 are clamped inside the two sleeves 21, and sealing rings 22 are clamped between the two sleeves 21 and the two extrusion rings 23. The same sucker rod 24 is inserted inside the two sealing rings 22. L-shaped tubes 25 are fixedly connected on the outer walls of the two sleeves 21, and sealing sleeves 26 are sleeved on the outer walls of the other ends of the two L-shaped tubes 25. An externally threaded tube 27 is clamped between the two L-shaped tubes 25. Both ends of the outer wall of the externally threaded tube 27 are threadedly connected with threaded tubes 28. A control valve 29 is fixedly connected at the center of the outer wall of the externally threaded tube 27. A pressure gauge 210 is fixedly connected on the outer wall of the externally threaded tube 27. The sealing ring 22 and the extrusion ring 23 are clamped into the sleeves 21 in sequence. Then, the sucker rod 24 is respectively inserted into the two sealing rings 22, and the two sleeves 21 are pushed to be clamped at the two ends of the cylinder 1. The sealing ring 22 and the sleeve 21 are pushed to fit tightly by squeezing the squeezing ring 23 through the cylinder 1, and the external threaded tube 27 is clamped between the two L-shaped tubes 25. The two threaded tubes 28 are rotated to move toward the two ends of the external threaded tube 27, so that the threaded tube 28 is sleeved on the two L-shaped tubes 25 to fix the external threaded tube 27. At the same time, the inner wall between the external threaded tube 27 and the L-shaped tube 25 is sealed by the sealing sleeve 26, and then filling oil is injected into the external threaded tube 27 through the control valve 29. The oil enters the space between the sleeve 21 and the squeezing ring 23 through the L-shaped tube 25, and the outer wall of the sealing ring 22 is omnidirectionally squeezed by the pressure provided by the oil, so that the gap between the sealing ring 22 and the sucker rod 24 is sealed.

[0019] Specifically, the fixing assembly 3 includes four round blocks 31, and the four round blocks 31 are symmetrically fixedly connected to the outer walls of the two sleeves 21. A clamping groove 32 is opened on the surface of the four round blocks 31, and a clamping ring 33 is clamped inside the four clamping grooves 32. Two steel cables 34 are fixedly connected to the surfaces of the four clamping rings 33 respectively. A fixing block 35 is embedded on the surface of the center of the two steel cables 34, and a conical groove 36 is opened on the side walls of the two fixing blocks 35.

[0020] Specifically, the fastening assembly 4 includes four rings 41, which are fixedly sleeved on the surfaces of the two steel cables 34, and two arc blocks 42 are respectively embedded on the outer walls of the four rings 41. A threaded hole 43 is provided at the center of the inner wall of the two arc blocks 42, and the inside of the two threaded holes 43 is threadedly connected with a threaded rod 44, and the other ends of the two threaded rods 44 are fixedly connected with a rotating block 45, and the surfaces of the two rotating blocks 45 are provided with a plug hole 46, and the inside of the two plug holes 46 is plugged with a plug plate 47, and the outer walls of the two arc blocks 42 are provided with a slot 48. The position of the threaded rod 44 can be adjusted by rotating the rotating block 45, and the threaded rod 44 pushes the conical groove 36 to drive the fixed block 35 to move, so as to adjust the pulling strength of the steel cable 34 on the clamping rings 33 at both ends, and then the spacing between the two sleeves 21 can be adjusted to prevent the pressure between the sleeve 21 and the extrusion ring 23 from being too large, resulting in the sealing ring 22 being unable to move.

[0021] Specifically, the connecting component 5 includes a fixed cylinder 51, which is fixedly connected to the bottom of the sleeve 21 located at the lower end of the cylinder 1. Two card interfaces 52 are symmetrically provided on the outer wall of the lower end of the fixed cylinder 51. The inner walls of the two card interfaces 52 are fixedly connected with arc-shaped card blocks 53. The insides of the two arc-shaped card blocks 53 are clamped with card blocks 54. Two fixing caps 55 are movably sleeved on the outer walls of the two arc-shaped card blocks 53 and the two card blocks 54, respectively. The same fixed wellhead 56 is fixedly connected between the two card blocks 54. The fixed cylinder 51 is sleeved on the outer wall of the fixed wellhead 56, and the arc-shaped card block 53 is clamped on the upper end of the card block 54 so that the arc-shaped card block 53 and the card block 54 are clamped into a circular whole. Then the fixing cap 55 is sleeved on the outer wall of the arc-shaped card block 53 and the card block 54 so that the arc-shaped card block 53 and the card block 54 are fixed, thereby fixing the fixed cylinder 51 to the upper end of the fixed wellhead 56.

[0022] Specifically, the threaded tube 28 is sleeved on the outer wall of the sealing sleeve 26, and the sealing sleeve 26 is clamped between the L-shaped tube 25 and the externally threaded tube 27. The sealing sleeve 26 is squeezed between the L-shaped tube 25 and the externally threaded tube 27 through the threaded tube 28, so that the L-shaped tube 25 and the externally threaded tube 27 are sealed and connected.

[0023] Specifically, four snap grooves 32 are formed on the surfaces of four round blocks 31 which are away from each other. The diameter of the round block 31 is the same as the inner diameter of the snap ring 33 , so that the snap ring 33 can be correctly mounted on the surface of the round block 31 .

[0024] Specifically, the two plug plates 47 correspond to the two slots 48, and the two threaded rods 44 correspond to the two conical grooves 36, so that the plug plates 47 can be inserted into the slots 48 to fix the rotating block 45, and the threaded rods 44 can push the conical grooves 36 to drive the fixing block 35 to pull the steel cable 34, and then the spacing between the two clamping rings 33 can be adjusted through the steel cable 34.

[0025] Specifically, the outer walls of the arc-shaped block 53 and the connecting block 54 match the inner wall of the fixing cap 55, so that the fixing cap 55 can stably fix the arc-shaped block 53 and the connecting block 54, and the fixing tube 51 can be fixed to the upper end of the fixed wellhead 56 through the fixation of the arc-shaped block 53 and the connecting block 54.

[0026] When in use, firstly, the fixing cylinder 51 is sleeved on the outer wall of the fixed wellhead 56, the arc-shaped clamping block 53 is clamped on the upper end of the clamping block 54, so that the arc-shaped clamping block 53 and the clamping block 54 are clamped into a circular whole, and then the fixing cap 55 is sleeved on the outer wall of the arc-shaped clamping block 53 and the clamping block 54, so that the arc-shaped clamping block 53 and the clamping block 54 are fixed, and then the fixing cylinder 51 is fixed to the upper end of the fixed wellhead 56, the sealing ring 22 and the extrusion ring 23 are clamped into the sleeve 21 in turn, and then the sucker rod 24 is respectively inserted into the two sealing rings 22, and the two sleeves 21 are pushed to clamp on the cylinder 1. At both ends, the cylinder 1 squeezes the squeezing ring 23 to push the sealing ring 22 to fit tightly with the sleeve 21, and the external threaded tube 27 is clamped between the two L-shaped tubes 25. The two threaded cylinders 28 are rotated to move toward the two ends of the external threaded tube 27, so that the threaded cylinders 28 are sleeved on the two L-shaped tubes 25 to fix the external threaded tube 27. At the same time, the inner wall between the external threaded tube 27 and the L-shaped tube 25 is sealed by the sealing sleeve 26, and then the filling oil is injected into the external threaded tube 27 through the control valve 29. The oil enters the space between the sleeve 21 and the squeezing ring 23 through the L-shaped tube 25, and the sealing is pressed by the pressure provided by the oil. The outer wall of the ring 22 is omnidirectionally extruded, so that the gap between the sealing ring 22 and the sucker rod 24 is sealed, and the two sealing rings 22 provide a double-layer sealing effect to prevent the crude oil in the fixed wellhead 56 from spraying out. When the sucker rod 24 is laterally deflected by the external pressure, the space inside the sleeve 21 allows the sealing ring 22 to be displaced and deformed. However, due to the presence of the filling oil, the sealing ring 22 and the sucker rod 24 are stably connected, which allows the sealing ring 22 to adjust its position as the sucker rod 24 deflects, preventing the sucker rod 24 from causing excessive damage to the sealing ring 22 during the deflection process. The large friction greatly increases the service life of the sealing ring 22, reduces the frequency of shutdown maintenance of the oil pump, and greatly improves the production efficiency of the oil pump. At the same time, the positions of the two sleeves 21 are fixed by the clamping ring 33 and the steel cable 34. The position of the threaded rod 44 can be adjusted by rotating the rotating block 45. The threaded rod 44 pushes the conical groove 36 to drive the fixing block 35 to move, and the pulling strength of the steel cable 34 on the clamping rings 33 at both ends can be adjusted, thereby adjusting the distance between the two sleeves 21 to prevent the situation where the sealing ring 22 cannot move due to excessive pressure between the sleeve 21 and the extrusion ring 23.

[0027] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of the present invention is defined by the attached claims and their equivalents.

Claims

1. A wellhead sealing device for reducing wear of a polished rod using a deflection-following type, comprising a cylinder (1), a sealing component (2) being arranged outside the cylinder (1), a fixing component (3) being arranged on the surface of the sealing component (2), a fastening component (4) being arranged on the surface of the fixing component (3), and a connecting component (5) being arranged at the lower end of the sealing component (2); Features: The sealing assembly (2) comprises two sleeves (21), the two sleeves (21) are symmetrically sleeved on the outer walls at both ends of the cylinder (1), the interiors of the two sleeves (21) are clamped with extrusion rings (23), the two sleeves (21) and the two extrusion rings (23) are clamped with sealing rings (22), the interiors of the two sealing rings (22) are plugged with the same sucker rod (24), the outer walls of the two sleeves (21) are fixedly connected with L-shaped tubes (25), the outer walls of the other ends of the two L-shaped tubes (25) are sleeved with sealing sleeves (26), an externally threaded tube (27) is clamped between the two L-shaped tubes (25), the outer walls of the two externally threaded tubes (27) are both threadedly connected with threaded cylinders (28), the center of the outer wall of the externally threaded tube (27) is fixedly connected with a control valve (29), and the outer wall of the externally threaded tube (27) is fixedly connected with a pressure gauge (210).

2. A wellhead sealing device for reducing polished rod wear using a deflection-following type according to claim 1, characterized in that: The fixing assembly (3) comprises four round blocks (31), the four round blocks (31) being symmetrically fixedly connected to the outer walls of the two sleeves (21), the surfaces of the four round blocks (31) being provided with clamping grooves (32), the interiors of the four clamping grooves (32) being clamped with clamping rings (33), the surfaces of the four clamping rings (33) being respectively fixedly connected with two steel cables (34), the centers of the two steel cables (34) being provided with fixing blocks (35), and the side walls of the two fixing blocks (35) being provided with conical grooves (36).

3. A wellhead sealing device for reducing polished rod wear using a deflection-following type according to claim 1, characterized in that: The fastening assembly (4) comprises four sleeves (41), the four sleeves (41) being fixedly sleeved on the surfaces of the two steel cables (34), two arc blocks (42) being respectively embedded on the outer walls of the four sleeves (41), threaded holes (43) being provided at the centers of the inner walls of the two arc blocks (42), threaded rods (44) being threadedly connected to the interiors of the two threaded holes (43), rotating blocks (45) being fixedly connected to the other ends of the two threaded rods (44), plug holes (46) being provided on the surfaces of the two rotating blocks (45), plug plates (47) being plugged into the interiors of the two plug holes (46), and slots (48) being provided on the outer walls of the two arc blocks (42).

4. A wellhead sealing device for reducing polished rod wear using a deflection-following type according to claim 1, characterized in that: The connecting assembly (5) comprises a fixed cylinder (51), the fixed cylinder (51) being fixedly connected to the bottom of a sleeve (21) located at the lower end of the cylinder (1), two clamping interfaces (52) being symmetrically provided on the outer wall of the lower end of the fixed cylinder (51), arc-shaped clamping blocks (53) being fixedly connected to the inner walls of the two clamping interfaces (52), the interiors of the two arc-shaped clamping blocks (53) being clamped with clamping blocks (54), two fixed caps (55) being movably sleeved on the outer walls of the two arc-shaped clamping blocks (53) and the two clamping blocks (54), and the same fixed wellhead (56) being fixedly connected between the two clamping blocks (54).

5. The wellhead sealing device for reducing polished rod wear by following the deviation according to claim 1, characterized in that: The threaded tube (28) is sleeved on the outer wall of the sealing sleeve (26), and the sealing sleeve (26) is clamped between the L-shaped tube (25) and the external threaded tube (27).

6. The wellhead sealing device for reducing polished rod wear by following the deviation according to claim 2, characterized in that: The four clamping grooves (32) are formed on one side surface of the four round blocks (31) which are away from each other, and the diameter length of the round block (31) is the same as the inner diameter length of the clamping ring (33).

7. The wellhead sealing device for reducing polished rod wear by following the deviation according to claim 3 is characterized in that: The two inserting plates (47) correspond to the two slots (48), and the two threaded rods (44) correspond to the two conical grooves (36).

8. The wellhead sealing device for reducing polished rod wear by following the deviation according to claim 4, characterized in that: The outer walls of the arc-shaped clamping block (53) and the clamping block (54) match the inner wall of the fixing cap (55).

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