CN117072100A - Wellhead sealing protection device - Google Patents
Wellhead sealing protection device Download PDFInfo
- Publication number
- CN117072100A CN117072100A CN202311322364.7A CN202311322364A CN117072100A CN 117072100 A CN117072100 A CN 117072100A CN 202311322364 A CN202311322364 A CN 202311322364A CN 117072100 A CN117072100 A CN 117072100A
- Authority
- CN
- China
- Prior art keywords
- roller
- gland
- inner hole
- pressure
- offset body
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000007789 sealing Methods 0.000 title claims abstract description 25
- 238000012856 packing Methods 0.000 claims abstract description 31
- 239000002775 capsule Substances 0.000 claims abstract description 24
- 239000000945 filler Substances 0.000 claims abstract description 24
- 210000004907 gland Anatomy 0.000 claims abstract description 24
- 230000006835 compression Effects 0.000 claims description 4
- 238000007906 compression Methods 0.000 claims description 4
- 239000010720 hydraulic oil Substances 0.000 claims description 3
- 238000005299 abrasion Methods 0.000 abstract description 3
- 230000002035 prolonged effect Effects 0.000 abstract description 3
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 238000011084 recovery Methods 0.000 abstract 1
- 238000000605 extraction Methods 0.000 description 3
- 239000003921 oil Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 241000526146 Psylla buxi Species 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/02—Surface sealing or packing
- E21B33/03—Well heads; Setting-up thereof
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/10—Geothermal energy
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Earth Drilling (AREA)
Abstract
Wellhead sealing protection device relates to oil recovery wellhead technical field. The shaft screw is in sealing connection with the seat sleeve, an offset body is arranged in the seat sleeve, the offset body comprises a sphere at the lower part and an extension pipe at the upper part, an inner hole at the upper part of the seat sleeve is in threaded connection with the lower gland, and sealing rings are arranged between the sphere of the offset body and the lower gland as well as between the sphere of the offset body and the seat sleeve. The beneficial effects of the invention are as follows: when the sucker rod is located down-stroke, the pressure in the shaft is high, the pressure in the shaft acts on the high-pressure capsule through the bypass pipe, the high-pressure capsule expands downwards, the driving disc drives the roller to descend, the roller drives the rotary sleeve and the packing filler to rotate through the guide slideway when descending, and the packing filler is in a rotary state in such a circulation, so that the packing filler and the sucker rod are in uniform abrasion states, and the service lives of the sucker rod and the packing filler are prolonged.
Description
Technical Field
The invention relates to the technical field of oil extraction wellheads, in particular to a wellhead sealing protection device.
Background
The oil extraction wellhead is sealed to the sucker rod by packing filler to seal the pressure inside the wellhead, and because the pressure in the shaft is smaller than the pressure in the shaft when the sucker rod is in the down stroke when the sucker rod is in the up stroke, the packing filler seal belongs to static seal, has low adaptability when the pressure is changed, cannot actively adapt to the pressure change caused by the up and down stroke of the sucker rod, and meanwhile, the wellhead sealing filler and the sucker rod have eccentric wear problems.
Disclosure of Invention
The invention provides a wellhead sealing protection device, which aims to solve the problem that the existing oil extraction wellhead cannot adapt to pressure change in a shaft and a packing box sucker rod is eccentrically worn.
The technical scheme provided by the invention is as follows: the wellhead sealing protection device comprises a shaft, the shaft is in threaded sealing connection with a seat sleeve, an offset body is arranged in the seat sleeve, the offset body comprises a sphere at the lower part and an extension pipe at the upper part, an inner hole at the upper part of the seat sleeve is in threaded connection with a lower gland, sealing rings are arranged between the sphere of the offset body, the lower gland and the seat sleeve, and the offset body is adopted to reduce the eccentric wear degree of a sucker rod, which is the prior art and is not described;
the upper part of the extension pipe of the offset body is connected with an upper gland through threads, and a gland, a high-pressure capsule, a driving disc, a compression spring, a gasket and packing filler are sequentially arranged between the upper gland and the bottom of the inner cavity of the offset body;
the outer side of the packing filler is sleeved with a rotary sleeve, the rotary sleeve is in clearance fit connection with an inner hole of an extension pipe, a mechanical seal is arranged between the rotary sleeve and an offset body, a driving disc is connected with the inner hole of the extension pipe through a spline, a roller is arranged on the lower side of the driving disc, a guide slideway is arranged on the upper part of the inner hole of the rotary sleeve, the roller transversely stretches into the guide slideway, a bypass pipe is connected to the shaft, the bypass pipe upwards extends through the extension pipe and then is communicated with the inside of a high-pressure capsule, and a pressurizing mechanism is arranged in the middle of the bypass pipe;
the guide slideway comprises an upward slideway, a downward slideway, an upward inflection point and a downward inflection point between the upward slideway and the downward slideway, when the roller rises to reach the vertex of the upward slideway, the center of the roller passes over the downward inflection point, and when the roller descends to reach the lowest point of the downward slideway, the center of the roller passes over the upward inflection point;
the upper gland, the gasket, the rotary sleeve and the sphere are all provided with central holes, the diameter of the central holes is larger than that of the sucker rod, and packing filler is filled between the outer circle of the sucker rod and the inner hole of the rotary sleeve.
The inner hole of the high-pressure capsule is provided with a lining pipe, the inner hole of the lining pipe is not contacted with the sucker rod, and the upper part of the lining pipe is clamped between the high-pressure capsule and the pressure cap.
The supercharging mechanism comprises a cylinder sleeve, a large piston and a small piston are arranged in the cylinder sleeve, the large piston is positioned at the lower part of the small piston, the large piston and the small piston are fixedly connected, the large piston and the small piston are connected through a sealing ring and the cylinder sleeve in a clearance fit manner, the diameter of the large piston is twice that of the small piston, the upper side and the lower side of the cylinder sleeve are in sealing connection with a bypass pipe, and hydraulic oil is filled in a space above the small piston.
One side of the high-pressure capsule is vulcanized and fixedly connected with an eduction tube, and the eduction tube is hermetically connected with a bypass tube through a quick connector after extending out of a through hole formed in the tube wall of the extension tube.
The beneficial effects of the invention are as follows: when the sucker rod is in the down stroke, the pressure in the shaft is high, the pressure in the shaft acts on the high-pressure capsule through the bypass pipe, the high-pressure capsule expands downwards, the driving disc drives the roller to descend, the guide slideway drives the rotary sleeve and the packing filler to rotate when the roller descends, the pressure in the shaft is low when the sucker rod is in the up stroke, the driving disc ascends under the action of the compression spring, the roller ascends and drives the rotary sleeve and the packing filler to rotate again through the guide slideway, and the packing filler is in a rotary state in such a way to ensure that the packing filler and the sucker rod are in uniform abrasion states, so that the service lives of the sucker rod and the packing filler are prolonged;
the pressurizing mechanism transmits pressure to the small piston through the large piston, the pressure on the small piston is larger than the pressure in the shaft, namely the pressure of the high-pressure capsule to the packing filler is larger than the pressure in the shaft, and the sealing effect of the packing filler is ensured.
Drawings
FIG. 1 is a schematic diagram of the structure of the present invention;
an enlarged view at a of fig. 1 of fig. 2;
FIG. 3 is a schematic view of the structure of the pressurizing mechanism in the present invention;
fig. 4 is an expanded view of the slide of the present invention.
In the figure, 1-well bore, 2-seat cover, 3-offset body, 31-sphere, 32-extension tube, 4-lower gland, 5-upper gland, 6-press cap, 7-packing filler, 8-sucker rod, 9-bypass tube, 10-pressurizing mechanism, 11-high pressure capsule, 12-driving disk, 13-inner liner tube, 14-rotating sleeve, 15-mechanical seal, 16-spline, 17-roller, 18-guiding slideway, 19-small piston, 20-cylinder sleeve, 21-large piston, 22-eduction tube, 23-quick connector, 24-upward-moving slideway, 25-downward-moving slideway, 26-upward inflection point, 27-downward inflection point and 28-gasket.
Detailed Description
As shown in fig. 1-4, the wellhead sealing protection device comprises a shaft 1, the shaft 1 is in threaded sealing connection with a seat sleeve 2, an offset body 3 is arranged in the seat sleeve 2, the offset body 3 comprises a sphere 31 at the lower part and an extension pipe 32 at the upper part, an inner hole at the upper part of the seat sleeve 2 is in threaded connection with a lower gland 4, and sealing rings are arranged between the sphere 31 of the offset body 3 and the lower gland 4 as well as between the spherical body and the seat sleeve 2;
the upper part of the extension tube 32 of the offset body 3 is connected with an upper gland 5 in a threaded manner, and a gland 6, a high-pressure capsule 11, a driving disc 12, a compression spring, a gasket 28 and packing fillers 7 are sequentially arranged between the upper gland 5 and the bottom of the inner cavity of the offset body 3;
the outer side of the packing filler 7 is sleeved with a rotary sleeve 14, the rotary sleeve 14 is in clearance fit connection with the inner hole of an extension pipe 32, a mechanical seal 15 is arranged between the rotary sleeve 14 and the offset body 3, the rotary sleeve 14 can rotate while the mechanical seal 15 seals the rotary sleeve 14 and a ball body 31, the inner hole of a driving disc 12 and the inner hole of the extension pipe 32 are connected through a spline 16, the driving disc 12 can move up and down and cannot rotate, a roller 17 is arranged on the lower side of the driving disc 12, a guide slideway 18 is arranged at the upper part of the inner hole of the rotary sleeve 14, the roller 17 transversely stretches into the guide slideway 18, a bypass pipe 9 is connected to the upper side of a shaft 1, the bypass pipe 9 extends upwards to pass through the extension pipe 32 and is communicated with the inside of a high-pressure capsule 11, and a pressurizing mechanism 10 is arranged in the middle of the bypass pipe 9;
the guide chute 18 includes an upward chute 24, a downward chute 25, and an upward inflection point 26 and a downward inflection point 27 therebetween, the center of the roller 17 having passed the downward inflection point 27 when the roller 17 rises to reach the apex of the upward chute 24, and the center of the roller 17 having passed the upward inflection point 26 when the roller 17 descends to reach the lowest point of the downward chute 25;
the upper gland 5, the gland 6, the gasket 28, the rotary sleeve 14 and the sphere 31 are all provided with central holes, the diameter of the central holes is larger than that of the sucker rod 8, and the packing filler 7 is filled between the outer circle of the sucker rod 8 and the inner hole of the rotary sleeve 14.
The invention works by utilizing the principle that the pressure in the shaft 1 is small during the upstroke of the sucker rod 8 and the pressure in the shaft 1 is large during the downstroke of the sucker rod 8, when the sucker rod 8 is positioned in the downstroke, the pressure in the shaft 1 is high, the pressure in the shaft 1 acts on the high-pressure capsule 11 through the bypass pipe 9, the high-pressure capsule 11 expands downwards, the driving disc 12 drives the roller 17 to descend, the roller 17 drives the rotary sleeve 14 and the packing 7 to rotate through the guide slide way 18 when the roller 17 descends, the pressure in the shaft 1 is low when the sucker rod 8 ascends, the driving disc 12 drives the rotary sleeve 14 and the packing 7 to rotate again through the guide slide way 18, and the packing 7 is in a rotary state, so that the packing 7 and the sucker rod 8 are in a uniform abrasion state, and the service life of the sucker rod 8 and the packing 7 is prolonged.
The inner hole of the high-pressure capsule 11 is provided with a lining pipe 13, the inner hole of the lining pipe 13 is not contacted with the sucker rod 8, and the upper part of the lining pipe 13 is clamped between the high-pressure capsule 11 and the pressure cap 6.
The supercharging mechanism 10 comprises a cylinder sleeve 20, a large piston 21 and a small piston 19 are arranged in the cylinder sleeve 20, the large piston 21 is positioned at the lower part of the small piston 19, the large piston 21 and the small piston 19 are fixedly connected, the large piston 21 and the small piston 19 are connected through clearance fit of a sealing ring and the cylinder sleeve 20, the diameter of the large piston 21 is twice that of the small piston 19, the upper side and the lower side of the cylinder sleeve 20 are in sealing connection with a bypass pipe 9, and the space above the small piston 19 is filled with hydraulic oil.
The pressurizing mechanism 10 transmits pressure to the small piston 19 through the large piston 21, the pressure on the small piston 19 is larger than the pressure in the shaft 1, namely the pressure of the high-pressure capsule 11 to the packing 7 is larger than the pressure in the shaft 1, and the sealing effect of the packing 7 is ensured.
One side of the high-pressure capsule 11 is vulcanized and fixedly connected with the eduction tube 22, and the eduction tube 22 extends out of a through hole formed in the tube wall of the extension tube 32 and is then hermetically connected with the bypass tube 9 through the quick connector 23.
Claims (4)
1. Wellhead seal protection device, including pit shaft (1), its characterized in that: the well bore (1) is in threaded sealing connection with the seat cover (2), an offset body (3) is arranged in the seat cover (2), the offset body (3) comprises a sphere (31) at the lower part and an extension pipe (32) at the upper part, an inner hole at the upper part of the seat cover (2) is in threaded connection with the lower gland (4), and sealing rings are arranged between the sphere (31) of the offset body (3) and the lower gland (4) and the seat cover (2);
the upper part of an extension pipe (32) of the offset body (3) is connected with an upper gland (5) in a threaded manner, and a gland (6), a high-pressure capsule (11), a driving disc (12), a compression spring, a gasket (28) and packing fillers (7) are sequentially arranged between the upper gland (5) and the bottom of an inner cavity of the offset body (3);
the packing filler (7) is sleeved with a rotary sleeve (14), the rotary sleeve (14) is connected with an inner hole of an extension pipe (32) in a clearance fit manner, a mechanical seal (15) is arranged between the rotary sleeve (14) and an offset body (3), a driving disc (12) is connected with the inner hole of the extension pipe (32) through a spline (16), a roller (17) is arranged on the lower side of the driving disc (12), a guide slideway (18) is arranged on the upper part of the inner hole of the rotary sleeve (14), the roller (17) transversely stretches into the guide slideway (18), a bypass pipe (9) is connected to the upper side of a shaft (1), the bypass pipe (9) upwards extends to pass through the extension pipe (32) and then is communicated with the inside of a high-pressure capsule (11), and a pressurizing mechanism (10) is arranged in the middle of the bypass pipe (9);
the guide slide way (18) comprises an upward slide way (24), a downward slide way (25) and an upward inflection point (26) and a downward inflection point (27) between the upward slide way and the downward slide way, when the roller (17) rises to reach the top point of the upward slide way (24), the center of the roller (17) passes through the downward inflection point (27), and when the roller (17) descends to reach the lowest point of the downward slide way (25), the center of the roller (17) passes through the upward inflection point (26);
the upper gland (5), the gland (6), the gasket (28), the rotary sleeve (14) and the sphere (31) are all provided with central holes, the diameter of the central holes is larger than that of the sucker rod (8), and the packing filler (7) is filled between the outer circle of the sucker rod (8) and the inner hole of the rotary sleeve (14).
2. The wellhead seal protection device of claim 1, wherein: the inner hole of the high-pressure capsule (11) is provided with a lining pipe (13), the inner hole of the lining pipe (13) is not contacted with the sucker rod (8), and the upper part of the lining pipe (13) is clamped between the high-pressure capsule (11) and the pressure cap (6).
3. The wellhead seal protection device of claim 1, wherein: the supercharging mechanism (10) comprises a cylinder sleeve (20), a large piston (21) and a small piston (19) are arranged in the cylinder sleeve (20), the large piston (21) is located at the lower part of the small piston (19), the large piston (21) and the small piston (19) are fixedly connected, the large piston (21) and the small piston (19) are connected through a sealing ring and the cylinder sleeve (20) in clearance fit, the diameter of the large piston (21) is twice that of the small piston (19), the upper side and the lower side of the cylinder sleeve (20) are in sealing connection with a bypass pipe (9), and hydraulic oil is filled in a space above the small piston (19).
4. The wellhead seal protection device of claim 1, wherein: one side of the high-pressure capsule (11) is vulcanized and fixedly connected with an eduction tube (22), and the eduction tube (22) extends out of a through hole formed in the tube wall of the extension tube (32) and is then connected with a bypass tube (9) in a sealing way through a quick connector (23).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311322364.7A CN117072100B (en) | 2023-10-13 | 2023-10-13 | Wellhead sealing protection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311322364.7A CN117072100B (en) | 2023-10-13 | 2023-10-13 | Wellhead sealing protection device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN117072100A true CN117072100A (en) | 2023-11-17 |
| CN117072100B CN117072100B (en) | 2024-01-12 |
Family
ID=88717390
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311322364.7A Active CN117072100B (en) | 2023-10-13 | 2023-10-13 | Wellhead sealing protection device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117072100B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117722141A (en) * | 2024-02-07 | 2024-03-19 | 大庆市瑞斯德石油机械制造有限公司 | Airtight casing nipple with special threads |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5791411A (en) * | 1996-03-11 | 1998-08-11 | Highland/Corod Inc. | Wellhead stuffing box for rotating rod string |
| CN209959211U (en) * | 2019-03-08 | 2020-01-17 | 大庆长垣能源科技有限公司 | Elastic self-guiding float shoe |
| CN111927368A (en) * | 2020-07-17 | 2020-11-13 | 华运隆腾机械制造有限公司 | Well head and sealing protection device |
| CN212671669U (en) * | 2020-08-04 | 2021-03-09 | 大庆新顺丰石油科技开发有限公司 | Wellhead double-sealing efficient filling device |
-
2023
- 2023-10-13 CN CN202311322364.7A patent/CN117072100B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5791411A (en) * | 1996-03-11 | 1998-08-11 | Highland/Corod Inc. | Wellhead stuffing box for rotating rod string |
| CN209959211U (en) * | 2019-03-08 | 2020-01-17 | 大庆长垣能源科技有限公司 | Elastic self-guiding float shoe |
| CN111927368A (en) * | 2020-07-17 | 2020-11-13 | 华运隆腾机械制造有限公司 | Well head and sealing protection device |
| CN212671669U (en) * | 2020-08-04 | 2021-03-09 | 大庆新顺丰石油科技开发有限公司 | Wellhead double-sealing efficient filling device |
Non-Patent Citations (1)
| Title |
|---|
| 湛从昌 等: "《液压可靠性设计基础与设计准则》", vol. 1, 冶金工业出版社, pages: 29 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117722141A (en) * | 2024-02-07 | 2024-03-19 | 大庆市瑞斯德石油机械制造有限公司 | Airtight casing nipple with special threads |
| CN117722141B (en) * | 2024-02-07 | 2024-04-26 | 大庆市瑞斯德石油机械制造有限公司 | Airtight casing nipple with special threads |
Also Published As
| Publication number | Publication date |
|---|---|
| CN117072100B (en) | 2024-01-12 |
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