CN220828240U - Hanging sealing structure of oil and gas production wellhead - Google Patents
Hanging sealing structure of oil and gas production wellhead Download PDFInfo
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- CN220828240U CN220828240U CN202322769787.5U CN202322769787U CN220828240U CN 220828240 U CN220828240 U CN 220828240U CN 202322769787 U CN202322769787 U CN 202322769787U CN 220828240 U CN220828240 U CN 220828240U
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- 238000007789 sealing Methods 0.000 title claims abstract description 165
- 238000004519 manufacturing process Methods 0.000 title claims description 5
- 239000002184 metal Substances 0.000 claims abstract description 63
- 238000004146 energy storage Methods 0.000 claims abstract description 38
- 238000000605 extraction Methods 0.000 claims abstract description 6
- 238000003825 pressing Methods 0.000 claims description 5
- 239000000725 suspension Substances 0.000 claims description 4
- 125000006850 spacer group Chemical group 0.000 claims description 3
- 230000005484 gravity Effects 0.000 abstract description 11
- 230000006835 compression Effects 0.000 abstract description 5
- 238000007906 compression Methods 0.000 abstract description 5
- 239000007789 gas Substances 0.000 description 16
- 230000000694 effects Effects 0.000 description 9
- 230000005540 biological transmission Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 230000007547 defect Effects 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
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Abstract
The utility model relates to the technical field of oil and gas exploitation, in particular to a hanging sealing structure of an oil extraction gas wellhead, which comprises an oil pipe head four-way joint, a hanger and an upper flange, wherein the upper end of the oil pipe head four-way joint and the lower end of the upper flange are fixedly arranged together, the lower part of the hanger is positioned on the inner side of the upper part of the oil pipe head four-way joint, the upper part of the hanger is positioned on the inner side of the lower part of the upper flange, at least two radial holes are formed in the upper part of the oil pipe head four-way joint, a limiting groove is formed in the outer side of the hanger corresponding to the radial holes, and an oil pipe head jackscrew with the inner end propped against the limiting groove is arranged in the radial holes. The utility model has reasonable structure, realizes good sealing through the first rubber sealing ring, the metal sealing compression ring, the spring energy storage sealing piece and the B-shaped sealing ring under the working condition of high gravity, realizes good sealing through the spring energy storage sealing piece under the working condition of low gravity, has various sealing modes and has good sealing reliability.
Description
Technical Field
The utility model relates to the technical field of oil and natural gas exploitation, in particular to a hanging sealing structure of a wellhead of an oil extraction gas well.
Background
The main function of the wellhead hanging sealing structure is to isolate an oil pipe from a sleeve pipe, so that a sealed annular space is formed between the oil pipe and the sleeve pipe, the wellhead hanging sealing structure is mainly used for exciting and sealing by transmitting gravity generated by the oil pipe to a hanger and then compacting a sealing piece, as disclosed in China patent publication No. CN203547638U, a high-temperature oil pipe head metal sealing device is disclosed, the sealing device comprises an oil pipe head reducing joint, a mandrel type oil pipe hanger and an oil pipe head four-way joint, the lower end of the oil pipe head reducing joint is fixed with the upper end of the oil pipe head four-way joint, a limiting taper table is arranged on the inner side of the upper part of the oil pipe head four-way joint, the mandrel type oil pipe hanger is positioned on the inner side of the upper part of the oil pipe head four-way joint, a lower metal sealing ring is fixed on the outer side of the lower part of the mandrel type oil pipe hanger, at least two radial holes are formed in the outer side of the upper part of the oil pipe head four-way joint, a jackwire locking sealing device is fixedly arranged in the radial holes, a limiting groove corresponding to the radial holes is formed in the outer side of the upper part of the mandrel type oil pipe hanger, the longitudinal opening of the limiting groove is outwards V-shaped, the jackwire sealing device is arranged between the inner end of the mandrel type jackwire is fixedly arranged on the inner side of the mandrel type sealing device and the end of the mandrel type oil pipe head and the metal sealing ring and the lower end is fixedly arranged between the limiting groove and the end of the lower end of the mandrel is fixedly arranged on the end of the mandrel type sealing ring. The utility model discloses a seal is realized to compress tightly on spacing frustum under the effect of the gravity of oil pipe transmission through lower metal seal ring in this patent, and its sealing means is single, only is applicable to high gravity operating mode, when oil pipe transmission to lower metal seal ring's gravity is less, leads to lower metal seal ring unable tightly to compress tightly on spacing frustum, and sealed inefficacy easily, so leads to the sealing reliability of this patent poor.
Disclosure of Invention
The utility model provides a hanging sealing structure for a wellhead of an oil extraction gas, which overcomes the defects of the prior art and can effectively solve the problem of poor sealing reliability of the existing hanging sealing structure for the wellhead.
The technical scheme of the utility model is realized by the following measures: the utility model provides a oil recovery gas wellhead suspension seal structure, including tubing head cross, hanger and upper flange, tubing head cross's upper end and upper flange's lower extreme fixed mounting are in the same place, tubing head cross's upper portion inboard, hanger's upper portion is located upper flange's lower part inboard, tubing head cross's upper portion is equipped with two at least radial holes, the outside of hanger of corresponding radial hole position is equipped with the spacing groove, be equipped with the tubing head jackscrew that the inner is tightly pressed in the spacing groove in the radial hole, tubing head cross's inboard of corresponding radial hole downside position is equipped with spacing cone, the outside of hanger of corresponding spacing cone position is equipped with first outer annular, install the metal seal clamping ring that can slide about and the outside is tightly pressed on spacing cone in the first outer annular, the outside of hanger of corresponding metal seal clamping ring downside position is fixedly installed and is tightly capped, the lower extreme of metal seal clamping ring sits on tightly capped, the upper end of metal seal clamping ring is a distance from the roof of first outer annular; the top wall of the first outer ring groove is provided with a second outer ring groove, a circle of first rubber sealing ring is arranged between the inner wall of the second outer ring groove and the inner wall of the tubing head four-way joint, an annular groove is arranged on the bottom surface of the first rubber sealing ring, an annular boss matched with the annular groove is arranged at the upper end of the metal sealing pressing ring, the upper part of the annular boss is positioned at the inner side of the lower part of the annular groove and is in sealing contact with the inner wall of the annular groove, a gas channel is arranged at the bottom of the metal sealing pressing ring corresponding to the position between the tightening cap and the inner wall of the tubing head four-way joint, and the upper end opening of the gas channel is positioned at the top of the annular boss.
The following are further optimizations and/or improvements to the above described inventive arrangements:
A third outer ring groove can be arranged on the top wall of the second outer ring groove, at least one spring energy storage sealing piece is arranged between the inner wall of the third outer ring groove and the inner wall of the oil pipe head four-way joint, and the spring energy storage sealing piece comprises a metal sealing ring body with a cross section of an optimal arc shape and a spiral spring which is circumferentially arranged in the metal sealing ring body in a surrounding way; the inner side and the outer side of the first rubber sealing ring are respectively provided with an inner annular metal framework and an outer annular metal framework.
An upper spring energy storage sealing piece and a lower spring energy storage sealing piece can be arranged between the inner wall of the third outer ring groove and the inner wall of the oil pipe head four-way joint, and a metal spacer ring is arranged between the two spring energy storage sealing pieces.
The outer side of the hanger corresponding to the position between the limiting groove and the third outer ring groove can be provided with a fourth outer ring groove, a circle of B-shaped sealing ring is arranged between the inner wall of the fourth outer ring groove and the inner wall of the oil pipe head four-way joint, and the B-shaped sealing ring comprises a B-shaped rubber sealing ring with a B-shaped cross section and an elastic metal ring embedded in the B-shaped rubber sealing ring.
A fifth outer ring groove can be formed in the outer side of the upper portion of the hanger, an upper spring energy storage sealing piece and a lower spring energy storage sealing piece are arranged between the inner wall of the fifth outer ring groove and the inner wall of the upper flange, a metal spacing ring is arranged between the two spring energy storage sealing pieces, and a limiting ring used for limiting the spring energy storage sealing piece in the fifth outer ring groove is fixedly arranged on the outer side of the hanger corresponding to the upper side of the fifth outer ring groove.
The outer side of the hanger corresponding to the lower side of the fifth outer ring groove can be provided with a sixth outer ring groove, a circle of B-shaped sealing ring is arranged between the inner wall of the sixth outer ring groove and the inner wall of the upper flange, and the B-shaped sealing ring comprises a B-shaped rubber sealing ring with a B-shaped cross section and an elastic metal ring embedded in the B-shaped rubber sealing ring.
The utility model has reasonable structure, realizes good sealing through the first rubber sealing ring, the metal sealing compression ring, the spring energy storage sealing piece and the B-shaped sealing ring under the working condition of high gravity, realizes good sealing through the spring energy storage sealing piece under the working condition of low gravity, and can realize sealing through the pressure gas in the well in addition, has various sealing modes and good sealing reliability.
Drawings
Fig. 1 is a schematic diagram of a front view of a preferred embodiment of the present utility model.
Fig. 2 is a schematic view of a partial enlarged structure of fig. 1.
Fig. 3 is a schematic cross-sectional front view of a first rubber seal ring according to a preferred embodiment of the present utility model.
Fig. 4 is a schematic cross-sectional front view of a spring energy storage seal in accordance with a preferred embodiment of the present utility model.
FIG. 5 is a schematic diagram of a cross-sectional front view of a B-ring seal in accordance with a preferred embodiment of the present utility model.
The codes in the drawings are respectively: the oil pipe head four-way joint is 1, 2 is a hanger, 3 is an upper flange, 4 is a limit groove, 5 is an oil pipe head jackscrew, 6 is a limit frustum, 7 is a metal sealing compression ring, 8 is a tight cap, 9 is a first rubber sealing ring, 10 is an annular groove, 11 is an annular boss, 12 is a gas channel, 13 is an inner annular metal framework, 14 is an outer annular metal framework, 15 is a metal sealing ring body, 16 is a coil spring, 17 is a metal spacer ring, 18 is a B-shaped sealing ring, 19 is an elastic metal ring, and 20 is a limit ring.
Detailed Description
The present utility model is not limited by the following examples, and specific embodiments can be determined according to the technical scheme and practical situations of the present utility model.
In the present utility model, for convenience of description, the description of the relative positional relationship of each component is described according to the layout manner of fig. 1 of the specification, for example: the positional relationship of the front, rear, upper, lower, left, right, etc. is determined in accordance with the layout direction of the drawings of the specification.
The utility model is further described below with reference to examples and figures:
As shown in fig. 1-5, the oil and gas well head suspension sealing structure comprises a tubing head four-way 1, a hanger 2 and an upper flange 3, wherein the upper end of the tubing head four-way 1 and the lower end of the upper flange 3 are fixedly arranged together, the lower part of the hanger 2 is positioned on the inner side of the upper part of the tubing head four-way 1, the upper part of the hanger 2 is positioned on the inner side of the lower part of the upper flange 3, at least two radial holes are formed in the upper part of the tubing head four-way 1, a limit groove 4 is formed in the outer side of the hanger 2 corresponding to the position of the radial holes, a tubing head jackscrew 5 with the inner end tightly pressed in the limit groove 4 is formed in the radial holes, a limit taper table 6 is formed in the inner side of the tubing head four-way 1 corresponding to the lower side of the radial holes, a first outer annular groove is formed in the outer side of the hanger 2 corresponding to the position of the limit taper table 6, a metal sealing ring 7 capable of sliding up and down relative to the hanger 2 and tightly pressing on the limit taper table 6 is arranged in the first outer annular groove, a tightening cap 8 is fixedly arranged on the outer side of the hanger 2 corresponding to the lower side of the hanger 2 of the metal sealing ring 7, a certain distance from the top wall 7 to the upper ring is separated from the first annular ring; the top wall of the first outer ring groove is provided with a second outer ring groove, a circle of first rubber sealing ring 9 is arranged between the inner wall of the second outer ring groove and the inner wall of the tubing head four-way joint 1, an annular groove 10 is arranged on the bottom surface of the first rubber sealing ring 9, the upper end of the metal sealing compression ring 7 is provided with an annular boss 11 matched with the annular groove 10, the upper part of the annular boss 11 is positioned on the inner side of the lower part of the annular groove 10 and is in sealing contact with the inner wall of the annular groove 10, a gas channel 12 is arranged at the bottom of the metal sealing compression ring 7 corresponding to the position between the tightening cap 8 and the inner wall of the tubing head four-way joint 1, and the upper end opening of the gas channel 12 is positioned at the top of the annular boss 11.
According to the requirement, the cross section of the annular groove 10 is an isosceles trapezoid with a small upper part and a large lower part, the cross section of the annular boss 11 is also an isosceles trapezoid with a small upper part and a large lower part, when the oil pipe is hung on the hanger 2, the gravity of the oil pipe is transmitted to the first rubber sealing ring 9 through the hanger 2, the first rubber sealing ring 9 is pressed to the annular boss 11 under the action of the transmitted gravity, the lips on the inner side and the outer side of the first rubber sealing ring 9 expand towards the inner side and the outer side respectively under the action of the propping action of the annular boss 11, so that the inner side lip of the first rubber sealing ring 9 and the inner wall of the first outer ring groove are propped together, and the outer side lip of the first rubber sealing ring 9 and the inner wall of the oil pipe head four-way 1 are propped together, thereby achieving a good sealing effect; in addition, through setting up the gas channel 12, the pressure gas in the annular space between oil pipe and the sleeve pipe gets into annular groove 10 through gas channel 12, the inside and outside both sides lip of first rubber seal 9 expands outside inwards respectively under the pressure effect of pressure gas, thereby the inner side lip of first rubber seal 9 and the inner wall of first outer annular are tight together, the outer side lip of first rubber seal 9 and the inner wall of oil pipe head cross 1 are tight together, also can play good sealed effect, namely the application can not only rely on oil pipe gravity to realize sealing, can also realize sealing with the help of the pressure gas in the well, the sealing mode is various, sealing reliability is good.
The above embodiments may be further optimized and/or modified according to practical needs:
As shown in fig. 1, 2 and 4, a third outer ring groove is arranged on the top wall of the second outer ring groove, at least one spring energy storage sealing element is arranged between the inner wall of the third outer ring groove and the inner wall of the oil pipe head four-way joint 1, and the spring energy storage sealing element comprises a metal sealing ring body 15 with a cross section of a perfect arc shape and a spiral spring 16 which is circumferentially arranged in the metal sealing ring body 15 in a surrounding manner. Specifically, the outer diameter of the coil spring 16 in the natural state is slightly larger than the inner diameter of the cross section of the metal sealing ring body 15, and the width of the annular cavity formed between the inner wall of the third outer annular groove and the inner wall of the tubing head four-way joint 1 is slightly smaller than the width of the metal sealing ring body 15, so that the coil spring 16 is assembled in the metal sealing ring body 15 in an interference manner, the metal sealing ring body 15 is assembled in the annular cavity formed between the inner wall of the third outer annular groove and the inner wall of the tubing head four-way joint 1 in an interference manner, and therefore the metal sealing ring body 15 always has a trend of opening inwards and outwards, namely, the inner and outer sides of the metal sealing ring body 15 respectively press the inner wall of the third outer annular groove and the inner wall of the tubing head four-way joint 1, so that a good sealing effect is achieved.
As shown in fig. 1-3, the inner side and the outer side of the first rubber sealing ring 9 are respectively provided with an inner annular metal framework 13 and an outer annular metal framework 14. The structural strength of the first rubber sealing ring 9 is enhanced, the service life is prolonged, in addition, when lips on the inner side and the outer side of the first rubber sealing ring 9 expand towards the inner side and the outer side respectively, the inner annular metal framework 13 can be tightly propped against the inner wall of the first outer annular groove, the outer annular metal framework 14 can be tightly propped against the inner wall of the oil pipe head four-way joint 1, a good sealing effect is achieved, a sealing mode is increased, and the sealing reliability is enhanced.
As shown in fig. 1-2, an upper spring energy storage sealing element and a lower spring energy storage sealing element are arranged between the inner wall of the third outer ring groove and the inner wall of the oil pipe head four-way joint 1, and a metal spacing ring 17 is arranged between the two spring energy storage sealing elements. Therefore, double sealing effect is achieved through the upper spring energy storage sealing piece and the lower spring energy storage sealing piece, sealing performance is improved, and specifically, the cross section of the metal spacing ring 17 is rectangular.
As shown in fig. 1, 2 and 5, a fourth outer ring groove is arranged on the outer side of the hanger 2 corresponding to the position between the limit groove 4 and the third outer ring groove, a circle of B-shaped sealing ring 18 is arranged between the inner wall of the fourth outer ring groove and the inner wall of the tubing head four-way joint 1, and the B-shaped sealing ring 18 comprises a B-shaped rubber sealing ring with a B-shaped cross section and an elastic metal ring 19 embedded in the B-shaped rubber sealing ring. The sealing mode is further increased by arranging the B-shaped sealing ring 18, the sealing reliability is enhanced, and the elastic metal ring 19 is embedded in the B-shaped sealing ring 18, so that the anti-torsion effect can be achieved.
As shown in fig. 1-2, a fifth outer ring groove is arranged on the outer side of the upper part of the hanger 2, an upper spring energy storage sealing element and a lower spring energy storage sealing element are arranged between the inner wall of the fifth outer ring groove and the inner wall of the upper flange 3, a metal spacing ring 17 is arranged between the two spring energy storage sealing elements, and a spacing ring 20 for spacing the spring energy storage sealing element in the fifth outer ring groove is fixedly arranged on the outer side of the hanger 2 corresponding to the upper side position of the fifth outer ring groove; a sixth outer ring groove is arranged on the outer side of the hanger 2 corresponding to the lower side of the fifth outer ring groove, a circle of B-shaped sealing ring 18 is arranged between the inner wall of the sixth outer ring groove and the inner wall of the upper flange 3, and the B-shaped sealing ring 18 comprises a B-shaped rubber sealing ring with a B-shaped cross section and an elastic metal ring 19 embedded in the B-shaped rubber sealing ring. Thereby ensuring good sealing properties between the hanger 2 and the inner wall of the upper flange 3.
The technical characteristics form the optimal embodiment of the utility model, have stronger adaptability and optimal implementation effect, and can increase or decrease unnecessary technical characteristics according to actual needs so as to meet the requirements of different situations.
Claims (9)
1. The oil extraction gas wellhead hanging sealing structure is characterized by comprising an oil pipe head four-way joint, a hanger and an upper flange, wherein the upper end of the oil pipe head four-way joint is fixedly arranged with the lower end of the upper flange; the top wall of the first outer ring groove is provided with a second outer ring groove, a circle of first rubber sealing ring is arranged between the inner wall of the second outer ring groove and the inner wall of the tubing head four-way joint, an annular groove is arranged on the bottom surface of the first rubber sealing ring, an annular boss matched with the annular groove is arranged at the upper end of the metal sealing pressing ring, the upper part of the annular boss is positioned at the inner side of the lower part of the annular groove and is in sealing contact with the inner wall of the annular groove, a gas channel is arranged at the bottom of the metal sealing pressing ring corresponding to the position between the tightening cap and the inner wall of the tubing head four-way joint, and the upper end opening of the gas channel is positioned at the top of the annular boss.
2. The oil and gas production wellhead suspension sealing structure according to claim 1, characterized in that a third outer ring groove is arranged on the top wall of the second outer ring groove, at least one spring energy storage sealing piece is arranged between the inner wall of the third outer ring groove and the inner wall of the oil and tubing head four-way joint, and the spring energy storage sealing piece comprises a metal sealing ring body with a cross section of a preferential arc shape and a spiral spring circumferentially arranged in the metal sealing ring body in a surrounding manner; the inner side and the outer side of the first rubber sealing ring are respectively provided with an inner annular metal framework and an outer annular metal framework.
3. The oil and gas production wellhead suspension sealing structure according to claim 2, characterized in that an upper spring energy storage sealing member and a lower spring energy storage sealing member are arranged between the inner wall of the third outer annular groove and the inner wall of the oil pipe head four-way joint, and a metal spacer ring is arranged between the two spring energy storage sealing members.
4. The hanging seal structure for oil and gas well head according to claim 1, 2 or 3, wherein a fourth outer ring groove is arranged on the outer side of the hanger corresponding to the position between the limit groove and the third outer ring groove, a circle of B-shaped sealing ring is arranged between the inner wall of the fourth outer ring groove and the inner wall of the four-way pipe head, and the B-shaped sealing ring comprises a B-shaped rubber sealing ring with a B-shaped cross section and an elastic metal ring embedded in the B-shaped rubber sealing ring.
5. The hanging seal structure for oil and gas production wellhead according to claim 1, 2 or 3, wherein a fifth outer ring groove is arranged on the outer side of the upper portion of the hanger, an upper spring energy storage seal and a lower spring energy storage seal are arranged between the inner wall of the fifth outer ring groove and the inner wall of the upper flange, a metal spacing ring is arranged between the two spring energy storage seals, and a limiting ring for limiting the spring energy storage seal in the fifth outer ring groove is fixedly arranged on the outer side of the hanger corresponding to the upper side of the fifth outer ring groove.
6. The hanging seal structure of oil and gas well head according to claim 4, wherein a fifth outer ring groove is arranged on the outer side of the upper portion of the hanger, an upper spring energy storage sealing element and a lower spring energy storage sealing element are arranged between the inner wall of the fifth outer ring groove and the inner wall of the upper flange, a metal spacing ring is arranged between the two spring energy storage sealing elements, and a spacing ring for spacing the spring energy storage sealing element in the fifth outer ring groove is fixedly arranged on the outer side of the hanger corresponding to the upper side of the fifth outer ring groove.
7. The hanging seal structure for oil and gas well head according to claim 1, 2, 3 or 6, characterized in that a sixth outer ring groove is arranged on the outer side of the hanger corresponding to the lower side of the fifth outer ring groove, a ring of B-shaped sealing ring is arranged between the inner wall of the sixth outer ring groove and the inner wall of the upper flange, and the B-shaped sealing ring comprises a B-shaped rubber sealing ring with a B-shaped cross section and an elastic metal ring embedded in the B-shaped rubber sealing ring.
8. The hanging sealing structure of oil extraction gas wellhead according to claim 4, characterized in that a sixth outer ring groove is arranged on the outer side of the hanger corresponding to the lower side of the fifth outer ring groove, a circle of B-shaped sealing ring is arranged between the inner wall of the sixth outer ring groove and the inner wall of the upper flange, and the B-shaped sealing ring comprises a B-shaped rubber sealing ring with a B-shaped cross section and an elastic metal ring embedded in the B-shaped rubber sealing ring.
9. The hanging seal structure of oil extraction gas wellhead according to claim 5, characterized in that a sixth outer ring groove is arranged on the outer side of the hanger corresponding to the lower side of the fifth outer ring groove, a circle of B-shaped sealing ring is arranged between the inner wall of the sixth outer ring groove and the inner wall of the upper flange, and the B-shaped sealing ring comprises a B-shaped rubber sealing ring with a B-shaped cross section and an elastic metal ring embedded in the B-shaped rubber sealing ring.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322769787.5U CN220828240U (en) | 2023-10-16 | 2023-10-16 | Hanging sealing structure of oil and gas production wellhead |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322769787.5U CN220828240U (en) | 2023-10-16 | 2023-10-16 | Hanging sealing structure of oil and gas production wellhead |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220828240U true CN220828240U (en) | 2024-04-23 |
Family
ID=90723234
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202322769787.5U Active CN220828240U (en) | 2023-10-16 | 2023-10-16 | Hanging sealing structure of oil and gas production wellhead |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220828240U (en) |
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2023
- 2023-10-16 CN CN202322769787.5U patent/CN220828240U/en active Active
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