A wellhead sealing device with a follow-up type polished rod to reduce abrasion

Abstract

The application relates to the field of wellhead sealing, in particular to a wellhead sealing device with a light pole for reducing abrasion, which comprises a cylinder, a sealing assembly arranged outside the cylinder, a fixing assembly arranged on the surface of the sealing assembly, a fastening assembly arranged on the surface of the fixing assembly, a connecting assembly arranged at the lower end of the sealing assembly, and two sleeves in the sealing assembly, two layers of sealing effects are provided through two sealing rings, and the fixed wellhead is prevented from spraying crude oil; when the pumping rod is horizontally deviated under external pressure, the space in the sleeve enables the sealing ring to be displaced and deformed, the sealing ring is stably sleeved with the pumping rod through filling oil, the sealing ring can adjust its position along with the deviation of the pumping rod, excessive friction of the sealing ring caused by the deviation of the pumping rod is prevented, the service life of the sealing ring is greatly increased, the frequency of maintenance of the pumping unit is reduced, and the production efficiency of the 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 which adopts a deflection-following polished rod to reduce wear. Background Art

[0002] In oil production, pumping is the most common process. When the pumping unit is operating, the polished rod, which is constantly moving up and down, needs to be sealed at the wellhead to prevent the liquid in the well from flowing out from around the rod and polluting the environment. To achieve the purpose of sealing the polished rod, a sealing box is installed at the wellhead. The sealing box is equipped with a sealing member for sealing the polished rod.

[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 causes 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, so replacing the packing affects 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 deflection-following polished rod wear reduction device.

[0005] The technical solution adopted by the present invention to solve the technical problem is: a wellhead sealing device using a deflection-following polished rod wear reduction device, comprising a cylinder, a sealing assembly is provided on the outside of the cylinder, a fixing assembly is provided on the surface of the sealing assembly, a fastening assembly is provided on the surface of the fixing assembly, and a connecting assembly is provided at the lower end of the sealing assembly;

[0006] The sealing assembly includes two sleeves, which are symmetrically sleeved on the outer walls at both ends of the cylinder, and the interior of the two sleeves is clamped with an extrusion ring, and a sealing ring is clamped between the two sleeves and the two extrusion rings. The same sucker rod is inserted into the interior of the two sealing rings, and the outer walls of the two sleeves are fixedly connected with an L-shaped tube, and the outer walls of the other ends of the two L-shaped tubes are sleeved with a sealing sleeve, and an externally threaded tube is clamped between the two L-shaped tubes, and both ends of the outer walls of the externally threaded tubes are threadedly connected with threaded cylinders, a control valve is fixedly connected at the center of the outer wall of the externally threaded tube, and a pressure gauge is fixedly connected to the outer wall of the externally threaded tube.

[0007] Specifically, the fixing assembly comprises four round blocks, the four round blocks are symmetrically fixedly connected to the outer walls of the two sleeves, clamping grooves are formed in the surfaces of the four round blocks, clamping rings are clamped in the four clamping grooves, two steel ropes are fixedly connected to the surfaces of the four clamping rings respectively, fixed blocks are embedded in the surfaces of the centers of the two steel ropes, and taper grooves are formed in the side walls of the two fixed blocks.

[0008] Specifically, the fastening assembly comprises four sleeve rings, the four sleeve rings are fixedly sleeved on the surfaces of the two steel ropes, two arc blocks are embedded on the outer walls of the four sleeve rings respectively, threaded holes are formed in the inner walls of the centers of the two arc blocks, threaded rods are screwed into the two threaded holes respectively, rotating blocks are fixedly connected to the other ends of the two threaded rods, insertion holes are formed in the surfaces of the two rotating blocks, insertion plates are inserted into the two insertion holes respectively, and insertion grooves are formed in the outer walls of the two arc blocks.

[0009] Specifically, the connecting assembly comprises a fixing cylinder, the fixing cylinder is fixedly connected to the bottom of the sleeve at the lower end of the cylinder, two clamping interfaces are symmetrically formed in the outer wall of the lower end of the fixing cylinder, arc-shaped clamping blocks are fixedly connected to the inner walls of the two clamping interfaces, clamping blocks are clamped in the interiors of the two arc-shaped clamping blocks, two fixing caps are movably sleeved on the outer walls of the two arc-shaped clamping blocks and the two clamping blocks respectively, and the same fixing well mouth is fixedly connected between the two clamping blocks.

[0010] Specifically, the threaded cylinder is sleeved on the outer wall of the sealing sleeve, and the sealing sleeve is clamped between the L-shaped pipe and the externally threaded pipe.

[0011] Specifically, the four clamping grooves are formed in the side surfaces of the four round blocks away from each other, and the diameter length of the round block is the same as the inner diameter length of the clamping ring.

[0012] Specifically, the two insertion plates correspond to the two insertion grooves, and the two threaded rods correspond to the two taper grooves.

[0013] Specifically, the outer walls of the arc-shaped clamping blocks and the clamping blocks are matched with the inner wall of the fixing cap.

[0014] The beneficial effects of the present application are as follows:

[0015] The present invention describes a wellhead sealing device that uses a follow-up type polished rod to reduce wear. The two sealing rings provide a two-layer sealing effect to prevent the crude oil in the 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 connected, which allows the sealing ring to adjust its own position as the sucker rod deflects, preventing the sucker rod from causing excessive friction on the sealing ring during the deflection process, greatly increasing the service life of the sealing ring, reducing the frequency of pumping unit shutdowns for maintenance, and greatly improving the production efficiency of the pumping unit. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The present invention will be further described below with reference to the accompanying drawings and examples.

[0017] Figure 1 A schematic structural diagram of a wellhead sealing device for reducing polished rod wear using a deflection-following polished rod provided by the present invention;

[0018] Figure 2 A schematic cross-sectional view of a wellhead sealing device for reducing polished rod wear using a deflection-following polished rod provided by the present invention;

[0019] Figure 3 A schematic diagram of the structure of the connection assembly of a wellhead sealing device using a deflection-following polished rod wear reduction method provided by the present invention;

[0020] Figure 4 A schematic diagram of the structure of the fixing components of a wellhead sealing device using a deflection-following polished rod wear reduction method provided by the present invention;

[0021] 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;

[0022] 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;

[0023] Figure 7 This is a schematic diagram of the fixed cylinder structure of a wellhead sealing device that uses a deflection-following polished rod wear reduction device provided by the present invention.

[0024] In the figure: 1, cylinder; 2, sealing assembly; 21, sleeve; 22, sealing ring; 23, extrusion ring; 24, sucker rod; 25, L-shaped pipe; 26, sealing sleeve; 27, externally threaded pipe; 28, threaded cylinder; 29, control valve; 210, pressure gauge; 3, fixing assembly; 31, round block; 32, clamping groove; 33, clamping ring; 34, steel cable; 35, fixing block; 36, taper groove; 4, fastening assembly; 41, collar; 42, arc block; 43, threaded hole; 44, threaded rod; 45, rotating block; 46, insertion hole; 47, insertion plate; 48, insertion groove; 5, connecting assembly; 51, fixing cylinder; 52, clamping interface; 53, arc clamping block; 54, clamping block; 55, fixing cap; 56, fixed wellhead. DETAILED DESCRIPTION

[0025] In order to make the technical means, creative features, purposes and effects realized by the present application easy to understand, the present application is further described below in combination with specific embodiments.

[0026] As Figures 1-7 shown, the wellhead sealing device with the light pole reducing abrasion of the present application is a random deviation and motion type, which comprises a cylinder 1, the outside of the cylinder 1 is provided with a sealing assembly 2, the surface of the sealing assembly 2 is provided with a fixing assembly 3, the surface of the fixing assembly 3 is provided with a fastening assembly 4, and the lower end of the sealing assembly 2 is provided with a connecting assembly 5.

[0027] The sealing assembly 2 includes two sleeves 21, which are symmetrically sleeved on the outer walls of both ends of the cylinder 1. The interior of the two sleeves 21 is clamped with an extrusion ring 23, and a sealing ring 22 is clamped between the two sleeves 21 and the two extrusion rings 23. The interior of the two sealing rings 22 is plugged with the same sucker rod 24. The outer walls of the two sleeves 21 are fixedly connected with an L-shaped tube 25, and the outer walls of the other ends of the two L-shaped tubes 25 are sleeved with a sealing sleeve 26. An externally threaded tube 27 is clamped between the two L-shaped tubes 25, and both ends of the outer wall of the externally threaded tube 27 are threadedly connected with a threaded tube 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. The sealing ring 22 and the extrusion ring 23 are clamped into the sleeve 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 23 is squeezed by the cylinder 1 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 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. 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. 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.

[0028] Specifically, the fixing assembly 3 includes four round blocks 31, which are symmetrically fixedly connected to the outer walls of the two sleeves 21. A card groove 32 is provided on the surface of the four round blocks 31, and a snap ring 33 is clamped inside the four card grooves 32. Two steel cables 34 are fixedly connected to the surface of the four snap 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 provided on the side walls of the two fixing blocks 35.

[0029] 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 embedded on the outer walls of the four rings 41 respectively. A threaded hole 43 is provided at the center of the inner wall of the two arc blocks 42. The inside of the two threaded holes 43 is threadedly connected to a threaded rod 44, and the other ends of the two threaded rods 44 are fixedly connected to a rotating block 45. Plug holes 46 are provided on the surface of the two rotating blocks 45, and a plug plate 47 is inserted into the inside of the two plug holes 46. Slots 48 are provided on the outer walls of the two arc blocks 42. 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 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, which will cause the sealing ring 22 to be unable to move.

[0030] The cam 53 is fixed to the bottom of the sleeve 21 at the lower end of the cylinder 1, and 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, and the inner walls 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. The two card blocks 54 are fixedly connected with the same fixed wellhead 56. 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.

[0031] 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.

[0032] Specifically, four slots 32 are provided on one side of the four round blocks 31 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 fitted on the surface of the round block 31 .

[0033] Specifically, the two insert plates 47 correspond to the two slots 48, and the two threaded rods 44 correspond to the two conical grooves 36, so that the insert plates 47 can be inserted into the slots 48 to fix the rotating block 45. 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.

[0034] Specifically, the outer walls of the arc-shaped clamping block 53 and the clamping block 54 match the inner wall of the fixing cap 55, so that the fixing cap 55 can stably fix the arc-shaped clamping block 53 and the clamping block 54. Through the fixation of the arc-shaped clamping block 53 and the clamping block 54, the fixing tube 51 can be fixed to the upper end of the fixed wellhead 56.

[0035] When in use, firstly, the fixed cylinder 51 is sleeved on the outer wall of the fixed wellhead 56, and 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. 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, thereby fixing the fixed cylinder 51 to the upper end of the fixed wellhead 56, and the sealing ring 22 and the extrusion ring 23 are clamped into the sleeve 21 in sequence, and then the sucker rod 24 is respectively inserted into the two sealing rings 22, and the two sleeves 21 are pushed to clamp into the cylinder 1. At both ends, the cylinder 1 squeezes the extrusion 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 cylinder 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. 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 extrusion ring 23 through the L-shaped tube 25, and the seal is pressed by the pressure provided by the oil. The outer wall of the ring 22 is omnidirectionally squeezed to seal the gap between the sealing ring 22 and the sucker rod 24. 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 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. This 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 maintenance shutdowns of the oil pumping unit, and greatly improves the production efficiency of the oil pumping unit. 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 sealing ring 22 from being unable to move due to excessive pressure between the sleeve 21 and the extrusion ring 23.

[0036] The above shows and describes the basic principles, main features and advantages of the present application. Those skilled in the art should understand that the present application is not limited to the above embodiments, and the above embodiments and descriptions in the specification are only to illustrate the principles of the present application. Without departing from the spirit and scope of the present application, various changes and improvements can be made to the present application, and these changes and improvements all fall within the scope of the present application. The scope of protection of the present application is defined by the appended 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 provided on the outside of the cylinder (1), a fixing component (3) being provided on the surface of the sealing component (2), a fastening component (4) being provided on the surface of the fixing component (3), and a connecting component (5) being provided at the lower end of the sealing component (2); Its characteristics are: The sealing assembly (2) comprises two sleeves (21), the two sleeves (21) are symmetrically sleeved on the outer walls of both ends of the cylinder (1), the interiors of the two sleeves (21) are clamped with an extrusion ring (23), a sealing ring (22) is clamped between the two sleeves (21) and the two extrusion rings (23), 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 an L-shaped tube (25), the outer walls of the other ends of the two L-shaped tubes (25) are sleeved with a sealing sleeve (26), an externally threaded tube (27) is clamped between the two L-shaped tubes (25), both ends of the outer walls of the externally threaded tubes (27) are threadedly connected with a threaded cylinder (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); The fixing assembly (3) comprises four round blocks (31), the four round blocks (31) are symmetrically fixedly connected to the outer walls of the two sleeves (21), the surfaces of the four round blocks (31) are provided with clamping grooves (32), the interiors of the four clamping grooves (32) are clamped with clamping rings (33), the surfaces of the four clamping rings (33) are respectively fixedly connected with two steel cables (34), a fixing block (35) is embedded on the surface at the center of the two steel cables (34), and a tapered groove (36) is provided on the side walls of the two fixing blocks (35); The fastening assembly (4) includes four rings (41), the four rings (41) are fixedly sleeved on the surfaces of the two steel cables (34), two arc blocks (42) are respectively embedded on the outer walls of the four rings (41), threaded holes (43) are provided at the centers of the inner walls of the two arc blocks (42), the interiors of the two threaded holes (43) are threadedly connected to threaded rods (44), the other ends of the two threaded rods (44) are fixedly connected to rotating blocks (45), the surfaces of the two rotating blocks (45) are provided with insertion holes (46), the interiors of the two insertion holes (46) are plugged with insertion plates (47), and the outer walls of the two arc blocks (42) are provided with slots (48); The connecting assembly (5) comprises a fixed cylinder (51), the fixed cylinder (51) being fixedly connected to the bottom of the sleeve (21) located at the lower end of the cylinder (1), two card interfaces (52) being symmetrically provided on the outer wall of the lower end of the fixed cylinder (51), arc-shaped card blocks (53) being fixedly connected to the inner walls of the two card interfaces (52), the interiors of the two arc-shaped card blocks (53) being card-connected to card blocks (54), two fixed caps (55) being movably sleeved on the outer walls of the two arc-shaped card blocks (53) and the two card blocks (54), and a fixed wellhead (56) being fixedly connected between the two card blocks (54).

2. The wellhead sealing device for reducing polished rod wear using a deflection-following type 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).

3. The wellhead sealing device for reducing polished rod wear using a deflection-following type according to claim 1, characterized in that: The four clamping grooves (32) are formed on one side surface of the four round blocks (31) that are away from each other. The diameter length of the round blocks (31) is the same as the inner diameter length of the clamping ring (33).

4. The wellhead sealing device for reducing polished rod wear using a deflection-following type according to claim 1, characterized in that: The two inserting plates (47) correspond to the two slots (48), and the two threaded rods (44) correspond to the two tapered grooves (36).

5. The wellhead sealing device for reducing polished rod wear using a deflection-following type according to claim 1, 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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