Swinging anti-wear wellhead sealer

Abstract

The present invention relates to the technical field of oilfield operation equipment, and is a swing-type anti-eccentric wear wellhead sealer, comprising a suspension joint, a hollow plunger, a spherical joint, a sucker rod and a sealing assembly, wherein the lower part of the suspension joint is provided with a housing chamber opening downward, the upper part of the hollow plunger is sleeved in the housing chamber and fixed with the suspension joint, the upper part of the hollow plunger is seated with a spherical joint, the spherical joint is located in the housing chamber and can be adjusted relative to the hollow plunger, the lower part of the spherical joint is connected with the upper part of the sucker rod, the lower part of the sucker rod is located inside the hollow plunger, and the sealing assembly is sleeved on the outer side of the lower part of the hollow plunger. The adjustment of the reciprocating deflection angle of the sucker rod is achieved by adjusting the position of the spherical joint, so that the operating angle of the sucker rod meets the operating requirements of the oil well deflection without affecting the up and down reciprocating motion of the hollow plunger, which not only avoids the eccentric wear of the hollow plunger and the sealing assembly, but also makes its structure more compact, which is convenient for daily maintenance and care.

Description

Technical Field

[0001] The invention relates to the technical field of oilfield operation equipment and relates to a swing-type anti-eccentric wear wellhead sealer. Background Art

[0002] Oil wells are generally hundreds of meters or even thousands of meters deep. It is difficult to avoid deflection during drilling. The saying "nine out of ten wells are deflected" means that only a few oil wells are not deflected. The oil wellhead packing is the seal of the wellhead. Due to the deflection of the oil well, the packing is worn eccentrically during operation, and the frequent friction greatly reduces the life of the packing. The replacement of the packing requires well pressure and pressure release, which not only consumes a lot of time, but also increases the labor intensity of the operators to replace the packing and clean up the leaked crude oil. In addition, it is difficult to recover the leaked crude oil, which not only causes great pollution to the environment, but also consumes a lot of energy to pump oil during the crude oil recovery process, which increases the operating cost. Summary of the invention

[0003] The present invention provides a swing-type anti-eccentric wear wellhead sealer, which overcomes the shortcomings of the above-mentioned prior art and can effectively solve the problem of eccentric wear of the seal during the operation of the oil pump.

[0004] The technical solution of the present invention is achieved through the following measures: a swinging anti-eccentric wear wellhead sealer, including a suspension joint, a hollow plunger, a spherical joint, a sucker rod and a sealing assembly, the lower part of the suspension joint is provided with a accommodating cavity opening downward, the upper part of the hollow plunger is sleeved in the accommodating cavity and fixed together with the suspension joint, the upper part of the hollow plunger is seated with a spherical joint, the spherical joint is located in the accommodating cavity and can be adjusted in position relative to the hollow plunger, the lower part of the spherical joint is connected to the upper part of the sucker rod, the lower part of the sucker rod is located on the inner side of the hollow plunger, and the sealing assembly is sleeved on the outer side of the lower part of the hollow plunger.

[0005] The following are further optimizations and / or improvements to the above technical solutions:

[0006] The lower part of the suspension joint is connected to the upper part of the hollow plunger through threads, and the lower part of the spherical joint is connected to the upper part of the sucker rod through threads.

[0007] The above-mentioned sealing assembly includes an upper pressure cap, a primary packing middle sleeve, a secondary packing middle sleeve, a packing box base, a packing upper pressure block and packing. The outer side of the lower part of the hollow plunger is sequentially mounted with an upper pressure cap, a primary packing middle sleeve, a secondary packing middle sleeve and a packing box base from top to bottom; the upper pressure cap, the primary packing middle sleeve, the secondary packing middle sleeve and the packing box base are sequentially connected together from top to bottom, and a sealing cavity is formed between the lower part of the upper pressure cap and the upper part of the primary packing middle sleeve, and between the lower part of the primary packing middle sleeve and the upper part of the secondary packing middle sleeve, and the packing upper pressure block and the packing are sequentially installed in the sealing cavity from top to bottom.

[0008] The lower part of the upper pressure cap and the upper part of the primary packing sleeve, the lower part of the primary packing sleeve and the upper part of the secondary packing sleeve, the lower part of the secondary packing sleeve and the upper part of the packing box base are all connected together through threads.

[0009] A blowout prevention pump barrel is provided at the lower part of the packing box base, and the blowout prevention pump barrel is sleeved on the outside of the hollow plunger. The upper part of the blowout prevention pump barrel is connected to the lower part of the packing box base through a thread. A mounting hole is provided on the outside of the packing box base, and the mounting hole is connected to the gap between the packing box base and the outside of the hollow plunger. An air release valve is provided in the mounting hole.

[0010] The inner side of the secondary packing sleeve is provided with an annular groove, in which an oil ring and an O-ring are arranged in sequence, the inner side of the oil ring abuts against the outer side of the hollow plunger, and the outer side of the oil ring abuts against the inner side of the O-ring.

[0011] The invention has a reasonable and compact structure and is easy to use. The spherical joint is seated on the upper part of the hollow plunger and can rotate relative to the hollow plunger. The position of the spherical joint is adjusted to achieve the adjustment of the deflection angle of the reciprocating motion of the sucker rod. The operating angle of the sucker rod meets the operating requirements of the oil well deflection without affecting the up and down reciprocating motion of the hollow plunger. Not only does it avoid eccentric wear between the hollow plunger and the sealing component, but it also makes the structure more compact and convenient for daily maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Attached Figure 1 It is a schematic diagram of the main cross-sectional structure of the best embodiment of the present invention.

[0013] Attached Figure 2 It is a schematic diagram of the main structure of the best embodiment of the invention.

[0014] The codes in the accompanying drawings are: 1 is a hanging joint, 2 is a spherical joint, 3 is a hollow plunger, 4 is a sucker rod, 5 is an upper pressure cap, 6 is a packing upper pressure block, 7 is a packing, 8 is a primary packing middle sleeve, 9 is an oil ring, 10 is an O-ring, 11 is a secondary packing middle sleeve, 12 is a packing box base, 13 is a blowout preventer pump barrel, and 14 is an air release valve. DETAILED DESCRIPTION

[0015] The present invention is not limited by the following embodiments, and specific implementation methods can be determined based on the technical solution of the present invention and actual conditions.

[0016] In the present invention, for the convenience of description, the relative position relationship of each component is described according to the attached Figure 1 The positional relationships such as front, back, top, bottom, left, and right are described according to the layout directions of the drawings in the specification.

[0017] The present invention will be further described below in conjunction with embodiments and drawings:

[0018] As attached Figure 1 , 2 As shown, the swing-type anti-eccentric wear wellhead sealer includes a suspension joint 1, a hollow plunger 3, a spherical joint 2, a sucker rod 4 and a sealing assembly. The lower part of the suspension joint 1 is provided with a accommodating chamber opening downward, the upper part of the hollow plunger 3 is sleeved in the accommodating chamber and fixed to the suspension joint 1, the upper part of the hollow plunger 3 is seated with a spherical joint 2, the spherical joint 2 is located in the accommodating chamber and can be adjusted relative to the hollow plunger 3, the lower part of the spherical joint 2 is connected to the upper part of the sucker rod 4, the lower part of the sucker rod 4 is located on the inner side of the hollow plunger 3, and the outer side of the lower part of the hollow plunger 3 is sleeved with a sealing assembly.

[0019] During operation, the sealing assembly is fixed at the wellhead, the lower part of the hollow plunger 3 is located in the well, and the pumping unit drives the suspension joint 1 to reciprocate up and down, thereby causing the hollow plunger 3 to reciprocate up and down with the suspension joint 1; the sucker rod 4 is connected to the lower part of the spherical joint 2 and is located in the hollow plunger 3. Under the joint action of the spherical joint 2 and the hollow plunger 3, the sucker rod 4 reciprocates up and down in the hollow plunger 3. When the oil well deflects and causes the movement of the sucker rod 4 to deflect, the sucker rod 4 adjusts the position of the spherical joint 2 (the spherical joint 2 is seated on the upper part of the hollow plunger 3 and can be adjusted relative to the hollow plunger 3) to adapt to the operating conditions of the deflected oil well, while the hollow plunger 3 always maintains a straight reciprocating up and down motion, avoiding relative eccentric wear between the hollow plunger 3 and the sealing assembly. The spherical joint 2 is seated on the upper part of the hollow plunger 3 and can be adjusted relative to the hollow plunger 3. When the sucker rod 4 moves and deflects with the oil well deflection, the sucker rod 4 adjusts the position of the spherical joint 2 to adapt to the deflected working conditions of the oil well without affecting the deflection angle of the up and down reciprocating motion of the hollow plunger 3, which not only avoids the eccentric wear between the hollow plunger 3 and the sealing component, but also makes the structure more compact and convenient for daily maintenance. As needed, the length of the sucker rod 4 is greater than the length of the hollow plunger 3.

[0020] The above-mentioned swing-type anti-eccentric wear wellhead sealer can be further optimized and / or improved according to actual needs:

[0021] As attached Figure 1 , 2 As shown, the lower part of the suspension joint 1 is connected to the upper part of the hollow plunger 3 by threads, and the lower part of the spherical joint 2 is connected to the upper part of the sucker rod 4 by threads. The threaded connection between the suspension joint 1 and the hollow plunger 3 not only realizes the seal between the inside of the suspension joint 1 and the hollow plunger 3, but also facilitates disassembly and assembly, and is convenient for maintenance and care. The threaded connection between the spherical joint 2 and the sucker rod 4 makes its structure more compact, and also reduces the number of parts, preventing smaller parts from loosening and falling into the well during operation.

[0022] As attached Figure 1 , 2As shown, the sealing assembly includes an upper pressure cap 5, a primary packing sleeve 8, a secondary packing sleeve 11, a packing box base 12, a packing upper pressure block 6 and a packing 7. The upper pressure cap 5, the primary packing sleeve 8, the secondary packing sleeve 11 and the packing box base 12 are sequentially mounted on the outer side of the lower part of the hollow plunger 3 from top to bottom; the upper pressure cap 5, the primary packing sleeve 8, the secondary packing sleeve 11 and the packing box base 12 are sequentially connected together from top to bottom, and a sealing cavity is formed between the lower part of the upper pressure cap 5 and the upper part of the primary packing sleeve 8, and between the lower part of the primary packing sleeve 8 and the upper part of the secondary packing sleeve 11. The packing upper pressure block 6 and the packing 7 are sequentially installed in the sealing cavity from top to bottom. When in use, the lower part of the packing box base 12 is fixed on the wellhead fixing device. The sealing performance of the device is effectively guaranteed by the multi-stage packing seal, and the multi-stage sealing layers are stacked and pressed together to make its structure more compact. According to the needs, the packings 7 are all conical packings, which further improves the sealing performance of the device.

[0023] As attached Figure 1 , 2 As shown, the lower part of the upper pressure cap 5 and the upper part of the primary packing sleeve 8, the lower part of the primary packing sleeve 8 and the upper part of the secondary packing sleeve 11, the lower part of the secondary packing sleeve 11 and the upper part of the packing box base 12 are all connected together by threads. The threads not only play a sealing role, but also enable the upper pressure cap 5, the primary packing sleeve 8 and the secondary packing sleeve 11 to press the corresponding packing 7 during the tightening and rotating process, effectively improving the sealing performance.

[0024] As attached Figure 1 , 2 As shown, a blowout prevention pump barrel 13 is provided at the lower part of the packing box base 12, and the blowout prevention pump barrel 13 is sleeved on the outer side of the hollow plunger 3. The upper part of the blowout prevention pump barrel 13 is connected to the lower part of the packing box base 12 through a thread. A mounting hole is provided on the packing box base 12, and the mounting hole is communicated with the gap between the packing box base 12 and the outer side of the hollow plunger 3. An air release valve 14 is provided in the mounting hole. As required, the blowout prevention pump barrel 13 and the hollow plunger 3 are metal gap seals, so a small amount of oil and gas will leak into the gap between the packing box base 12 and the hollow plunger 3, causing oil and gas pressure. By providing the air release valve 14, exhaust and pressure reduction can be effectively performed to avoid affecting the replacement of the packing 7; the gap between the blowout prevention pump barrel 13 and the hollow plunger 3 is small, and exhaust and pressure reduction can be safely performed through the exhaust valve.

[0025] As attached Figure 1 , 2 As shown, a ring groove is provided inside the secondary packing sleeve 11, and an oil ring 9 and an O-ring 10 are provided in the ring groove in sequence. The inner side of the oil ring 9 abuts against the outer side of the hollow plunger 3, and the outer side of the oil ring 9 abuts against the inner side of the O-ring. Thus, the excess oil outside the hollow plunger 3 can be scraped off by the oil ring 9, thereby improving the sealing performance of the sealer. The O-ring 10 is an O-type rubber ring as required.

[0026] The above technical features constitute the best embodiment of the present invention, which has strong adaptability and best implementation effect. Non-essential technical features can be added or reduced according to actual needs to meet the requirements of different situations.

Claims

1. A swing-type anti-eccentric wear wellhead sealer, characterized in that It includes a suspension joint, a hollow plunger, a spherical joint, a sucker rod and a sealing assembly. The lower part of the suspension joint is provided with a accommodating chamber opening downward, the upper part of the hollow plunger is sleeved in the accommodating chamber and fixed to the suspension joint, the upper part of the hollow plunger is seated with a spherical joint, the spherical joint is located in the accommodating chamber and can be adjusted relative to the hollow plunger, the lower part of the spherical joint is connected with the upper part of the sucker rod, the lower part of the sucker rod is located on the inner side of the hollow plunger, and the outer side of the lower part of the hollow plunger is sleeved with a sealing assembly, the sealing assembly includes an upper pressure cap, a primary packing middle sleeve, a secondary packing middle sleeve, a packing box base, a packing upper pressure block and packing, and the outer side of the lower part of the hollow plunger is sequentially sleeved with an upper pressure cap, a primary packing middle sleeve, a secondary packing middle sleeve and a packing box base from top to bottom; the upper pressure cap, the primary packing middle sleeve, the secondary packing middle sleeve and the packing box base The packing middle sleeve and the packing box base are connected together in sequence from top to bottom, and a sealing cavity is formed between the lower part of the upper pressure cap and the upper part of the first-level packing middle sleeve, and between the lower part of the first-level packing middle sleeve and the upper part of the second-level packing middle sleeve. The packing upper pressure block and the packing are installed in the sealing cavity from top to bottom. A blowout prevention pump barrel is provided at the lower part of the packing box base, and the blowout prevention pump barrel is sleeved on the outside of the hollow plunger. The upper part of the blowout prevention pump barrel is connected to the lower part of the packing box base through threads. A mounting hole is provided on the outside of the packing box base, and the mounting hole is connected with the gap between the packing box base and the outside of the hollow plunger. An air release valve is provided in the mounting hole. The lower part of the upper pressure cap and the upper part of the first-level packing middle sleeve, the lower part of the first-level packing middle sleeve and the upper part of the second-level packing middle sleeve, the lower part of the second-level packing middle sleeve and the upper part of the packing box base are all connected together through threads.

2. The swing-type anti-eccentric wear wellhead sealer according to claim 1 is characterized in that The lower part of the hanging joint is connected to the upper part of the hollow plunger through threads, and the lower part of the spherical joint is connected to the upper part of the sucker rod through threads.

3. The swing-type anti-eccentric wear wellhead sealer according to claim 1 or 2, characterized in that An annular groove is arranged on the inner side of the middle sleeve of the secondary packing, and an oil ring and an O-ring are arranged in the annular groove in sequence. The inner side of the oil ring abuts against the outer side of the hollow plunger, and the outer side of the oil ring abuts against the inner side of the O-ring.

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