CN110578491B - High-pressure double-stage self-sealing blowout-preventing wellhead packing box - Google Patents
High-pressure double-stage self-sealing blowout-preventing wellhead packing box Download PDFInfo
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- CN110578491B CN110578491B CN201910903788.XA CN201910903788A CN110578491B CN 110578491 B CN110578491 B CN 110578491B CN 201910903788 A CN201910903788 A CN 201910903788A CN 110578491 B CN110578491 B CN 110578491B
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- packing
- main body
- boss
- abutted
- polish rod
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- 238000012856 packing Methods 0.000 title claims abstract description 114
- 238000007789 sealing Methods 0.000 title claims abstract description 25
- 230000009977 dual effect Effects 0.000 claims description 3
- 230000002265 prevention Effects 0.000 claims description 3
- 238000004891 communication Methods 0.000 claims description 2
- 238000005299 abrasion Methods 0.000 abstract description 10
- 230000002035 prolonged effect Effects 0.000 abstract description 7
- 239000003921 oil Substances 0.000 description 6
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 1
- 239000010779 crude oil Substances 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 230000036316 preload Effects 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
Abstract
The embodiment of the invention discloses a high-pressure double-stage self-sealing blowout-preventing wellhead packing box, which comprises: a main body portion; the adjusting press cap is in threaded connection with the polish rod inlet; the upper surface of the primary packing is abutted with the lower surface of the adjusting press cap; the upper surface of the primary piston is abutted with the lower surface of the primary packing, and the lower surface of the primary piston is abutted with the upper surface of the first boss; the upper surface of the secondary packing is abutted with the lower surface of the second boss; the upper surface of the secondary piston is abutted with the lower surface of the secondary packing, and the lower surface of the secondary piston is abutted with the upper surface of the third boss; the double control valve is arranged on the pressure balance pipe and communicated with the outside of the main body part. The high-pressure double-stage self-sealing blowout-preventing wellhead packing box disclosed by the invention has the advantages that the primary packing and the secondary packing are inverted, so that the primary packing can obtain stable pressure to reduce abrasion and prolong the service life; the double control valve is used for releasing pressure to the secondary packing, so that abrasion of the secondary packing is reduced, and the service life of the secondary packing is prolonged.
Description
Technical Field
The invention relates to the technical field of petroleum exploitation, in particular to a high-pressure double-stage self-sealing blowout-preventing wellhead packing box.
Background
The packing box mainly plays a sealing role between the polish rod and the oil pipe to prevent liquid from overflowing. The existing double-seal packing box adopts an upper-stage sealing mechanism and a lower-stage sealing mechanism, the primary seal plays a sealing role in normal production, and when packing is worn to a certain degree and cannot be sealed, the packing is compensated by tightening the adjusting pressing cap, so that the operation is repeated. The energy storage spring provides packing pre-tightening force in real time, so that the packing sealing effective period is prolonged; the secondary seal is temporarily applicable when the primary packing is replaced or other special conditions are met, and the purpose of replacing the packing without pressure relief is achieved.
The existing packing box is shown in fig. 1, packing is pressed by pretightening force to ensure the sealing between the packing box and a polished rod, and the pretightening force is controlled by feel, so that packing is worn too fast if pretightening force of a primary packing is too large; leakage may occur if the preload force is too small. The existing operation is that the pretightening force is too large to ensure that leakage cannot occur, so that the primary packing is worn too fast. The secondary packing is used under the condition of replacing the primary packing or special conditions, but because workers can not completely remove the pretightening force after the secondary packing is pretightened, the secondary packing is seriously worn, the service life of the secondary packing is shortened, and the energy consumption is increased.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, and provides a high-pressure double-stage self-sealing blowout-preventing wellhead packing box, which solves the technical problems that in the prior art, the abrasion of a primary packing and a secondary packing in the packing box is too fast and the service life is short.
In order to achieve the technical purpose, the embodiment of the invention provides a high-pressure double-stage self-sealing blowout-preventing wellhead packing box, which comprises: the main body part comprises a polish rod cavity, wherein the upper end of the main body part is provided with a polish rod inlet communicated with the polish rod cavity, the polish rod inlet is provided with an internal thread, the lower end of the main body part is provided with a polish rod outlet communicated with the polish rod cavity, a first boss, a second boss and a third boss extend from the upper part to the lower main body part to the inside of the polish rod cavity in sequence, the main body part is also provided with a pressure balance pipe, the upper end of the pressure balance pipe is communicated with the upper surface of the third boss, and the lower end of the pressure balance pipe is communicated with the upper part of the fourth boss; the adjusting press cap is in threaded connection with the polish rod inlet; the upper surface of the primary packing is abutted with the lower surface of the adjusting press cap; the upper surface of the primary piston is abutted with the lower surface of the primary packing, and the lower surface of the primary piston is abutted with the upper surface of the first boss; the upper surface of the secondary packing is abutted with the lower surface of the second boss; the upper surface of the secondary piston is abutted with the lower surface of the secondary packing, and the lower surface of the secondary piston is abutted with the upper surface of the third boss; the double control valve is arranged on the pressure balance pipe and communicated with the outside of the main body part.
Compared with the prior art, the invention has the following beneficial effects: according to the high-pressure double-stage self-sealing blowout-preventing wellhead packing box, the primary packing and the secondary packing are inverted, the primary packing pretightening force is derived from the piston, the piston is tightly pressed by utilizing the oil pressure of the oil pipe, and the packing is extruded by the piston, so that the primary packing can obtain stable pressure to reduce abrasion and prolong the service life; the normal pressure relief hole of the double control valve is in a closed state, the second-stage piston does not generate pressure on the second-stage packing, when the first-stage packing needs to be replaced, the pressure relief hole of the double control valve is communicated, the second-stage piston generates pressure on the second-stage packing, sealing is achieved, the first-stage packing is convenient to replace, the double control valve is closed after replacement is completed, the second-stage packing is depressurized, and abrasion of the second-stage packing is reduced so that the service life of the second-stage packing is prolonged.
Drawings
FIG. 1 is a cross-sectional view of a prior art packing box;
Fig. 2 is a cross-sectional view of one embodiment of a high pressure dual stage self-sealing blowout prevention wellhead packing box provided by the present invention.
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
Referring to fig. 2, fig. 2 is a cross-sectional view of an embodiment of a high-pressure dual-stage self-sealing blowout-preventing wellhead packing box provided by the present invention.
The high-pressure double-stage self-sealing blowout prevention wellhead packing box comprises: the device comprises a main body part 1, an adjusting press cap 2, a primary packing 3, a primary piston 4, a secondary packing 5, a secondary piston 6, a double control valve 7 and a ball valve 8.
The main body 1 includes an upper main body 11, a middle main body 12, and a lower main body 13, which are connected in this order from top to bottom. The upper main body 11, the middle main body 12 and the lower main body 13 are connected to form a tube shape, and a polish rod cavity 14 is arranged in the middle. A polish rod inlet is formed in the top end of the upper main body 11, the polish rod inlet is communicated with the polish rod cavity 14, and an internal thread is formed at the polish rod inlet. A polish rod outlet is arranged on the bottom surface of the lower main body 13, and the polish rod outlet is communicated with the polish rod cavity 14. A polish rod (not shown) reciprocates up and down within the polish rod cavity 14 to pump out subsurface crude oil. A first boss 15, a second boss 16 and a third boss 17 extend from the upper to the lower main body part 1 into the polish rod cavity 14. Wherein the first boss 15 and the second boss 16 are located in the middle body 12, and the third boss is located in the lower body 13. A first inclined portion is included between the first boss 15 and the polish rod inlet, the first inclined portion extends from the upper body 11 all the way to the middle body 12, and the inside diameter of the polish rod cavity 14 in the first inclined portion gradually increases from top to bottom. A second inclined portion is included between the second boss 16 and the third boss 17, the second inclined portion extends from the middle body 12 all the way to the lower body 13, and an inner diameter of the polish rod cavity 14 in the second inclined portion gradually increases from top to bottom.
The primary piston 4 is arranged in the polish rod cavity 14, and the hollow structure is convenient for the polish rod to pass through. The lower surface of the primary piston 4 is abutted with the upper surface of the first boss 15, and the upper surface is abutted with the lower surface of the primary packing 3. The primary packing 3 is placed in the polish rod cavity 14 in the first inclined portion, with its side surface abutting against the inner wall of the first inclined portion, extending from the upper body 11 to the middle body 12. The upper surface of the primary packing 3 is abutted with the adjusting press cap 2. The adjusting press cap 2 is in threaded engagement with the polish rod inlet, and the polish rod is convenient to pass through due to the hollow structure. Through the degree that the screw thread of adjusting the pressure cap 2 was twisted, can control and adjust the axial displacement of pressure cap 2 along main part 1 to change and adjust the pressure size that pressure cap 2 applyed to one-level packing 3, so that finely tune because the fine error that produces between the one-level packing 3 of difference, in order to guarantee that one-level packing 3 can be good when inserting the polished rod realization sealed, simultaneously again can reduce wearing and tearing as far as, the life of extension one-level packing 3.
The secondary piston 6 is arranged in the polish rod cavity 14, and the hollow structure is convenient for the polish rod to pass through. The lower surface of the secondary piston 6 is abutted with the upper surface of the third boss 17, and the upper surface is abutted with the lower surface of the secondary packing 5. The secondary packing 5 is placed in the polish rod cavity 14 in the second inclined portion, with the side surface abutting against the inner wall of the second inclined portion, extending from the middle body 12 to the lower body 13. The upper surface of the primary packing 3 is abutted with the lower surface of the second boss 16.
The secondary piston 6 and the lower main body 13 are surrounded to form a balance cavity 18, a pressure balance pipe 19 is arranged in the main body 1, the lower end of the pressure balance pipe 19 is communicated with the balance cavity, and the upper end of the pressure balance pipe is communicated with a polish rod cavity 14 on the upper surface of the second boss 16. The double control valve 7 is arranged on the pressure balance pipe 19 and communicated to the outside of the main body part 1, and is used for controlling the communication among the balance cavity 18, the polished rod cavity 14 and the outside of the main body part 1. In the normal state, the pressure release hole of the double control valve 7 communicated with the outside is closed, at the moment, the pressure balance pipe 19 is smooth, the balance cavity 18 is communicated with the polish rod cavity 14, the pressure of the two cavities is the same, and the secondary piston 6 does not apply pressure to the secondary packing 5.
The ball valve 8 is arranged in the polish rod cavity 14 and is positioned below the secondary piston 6. When the wellhead polish rod breaks off, the ball valve 8 can play a role in emergently cutting off and rapidly closing the wellhead.
The high-pressure double-stage self-sealing blowout-preventing wellhead packing box is arranged at a wellhead. When in normal use, the press cap 2 is adjusted to a suitable degree for the dimensional deviations of the different first packings 3. Meanwhile, the pressure release hole of the double control valve 7 communicated with the outside is closed, at the moment, the pressure balance pipe 19 is smooth, the balance cavity 18 is communicated with the polish rod cavity 14, the pressure of the two cavities is the same, the secondary piston 6 does not generate pressure on the secondary packing 5, the secondary packing 5 is basically not contacted with the polish rod, the abrasion of the secondary packing 5 is small, and the service life is greatly prolonged. When normal oil extraction operation is carried out, the polish rod reciprocates up and down, and the pressure applied by the primary piston 4 to the first packing 3 is periodically changed accordingly, so that the tightness between the first packing 3 and the polish rod is ensured, the abrasion of the first packing 3 is not excessively increased, and the service life of the first packing 3 is prolonged.
When the service life of the primary packing 3 is used up and the primary packing needs to be replaced, the pressure balance pipe 19 at the stage of the double control valve 7 is controlled, so that the polish rod cavity 14 is not communicated with the balance cavity 18, and the balance cavity 18 is communicated with the outside through the pressure relief hole. At this time, the pressure in the balance cavity 18 is the same as the atmospheric pressure, while the pressure in the polish rod cavity 14 is greater than one atmospheric pressure, and the pressure applied to the secondary piston 6 is transferred to the secondary packing 5, so that the secondary packing 5 is extruded to press the polish rod to realize sealing, and the primary packing 3 is replaced conveniently. After the primary packing 3 is replaced, the double control valve 7 is controlled to close the pressure relief hole, and meanwhile, the pressure balance pipe 19 is opened, so that the polish rod cavity 14 is communicated with the balance cavity 18, the pressures at two sides of the secondary piston 6 are balanced again, and the pressure applied to the secondary packing 5 by the secondary piston 6 is completely eliminated. The secondary packing 5 has no pressure residue, and is loosened with the polish rod again, so that the abrasion is reduced to the maximum extent, and the service life is prolonged.
The embodiment of the invention has the following beneficial effects: according to the high-pressure double-stage self-sealing blowout-preventing wellhead packing box, the primary packing and the secondary packing are inverted, the primary packing pretightening force is derived from the piston, the piston is tightly pressed by utilizing the oil pressure of the oil pipe, and the packing is extruded by the piston, so that the primary packing can obtain stable pressure to reduce abrasion and prolong the service life; the normal pressure relief hole of the double control valve is in a closed state, the second-stage piston does not generate pressure on the second-stage packing, when the first-stage packing needs to be replaced, the pressure relief hole of the double control valve is communicated, the second-stage piston generates pressure on the second-stage packing, sealing is achieved, the first-stage packing is convenient to replace, the double control valve is closed after replacement is completed, the second-stage packing is depressurized, and abrasion of the second-stage packing is reduced so that the service life of the second-stage packing is prolonged.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the invention.
Claims (2)
1. The utility model provides a high pressure doublestage is from sealing blowout prevention wellhead packing box which characterized in that, it includes:
the internal part of the main body part comprises a polish rod cavity, the upper end of the main body part is provided with a polish rod inlet communicated with the polish rod cavity, the lower end of the main body part is provided with an internal thread, the polish rod outlet is communicated with the polish rod cavity, a first boss, a second boss and a third boss extend from top to bottom into the polish rod cavity in sequence, the main body part is also provided with a pressure balance pipe, the upper end of the pressure balance pipe is communicated with the upper surface of the second boss, and the lower end of the pressure balance pipe is communicated with the upper part of the third boss;
the adjusting press cap is in threaded connection with the polish rod inlet;
the upper surface of the primary packing is abutted with the lower surface of the adjusting press cap;
The upper surface of the primary piston is abutted with the lower surface of the primary packing, and the lower surface of the primary piston is abutted with the upper surface of the first boss;
the upper surface of the secondary packing is abutted with the lower surface of the second boss;
the upper surface of the secondary piston is abutted with the lower surface of the secondary packing, and the lower surface of the secondary piston is abutted with the upper surface of the third boss;
the double control valve is arranged on the pressure balance pipe and communicated with the outside of the main body part;
The main body part comprises a first inclined part and a second inclined part, the inner diameters of the first inclined part and the second inclined part are gradually increased from top to bottom, the primary packing side surface is abutted with the first inclined part, and the secondary packing side surface is abutted with the second inclined part; the main body part comprises an upper main body, a middle main body and a lower main body which are sequentially connected from top to bottom; the first boss and the second boss are arranged on the middle main body, and the third boss is arranged on the lower main body; the primary packing extends from the upper body to the middle body, and the secondary packing extends from the middle body to the lower body; the secondary piston and the lower main body are surrounded to form a balance cavity, the lower end of the pressure balance pipe is communicated with the balance cavity, and the upper end of the pressure balance pipe is communicated with the polish rod cavity;
the high-pressure double-stage self-sealing blowout-preventing wellhead packing box further comprises a ball valve arranged below the secondary piston.
2. The high pressure dual stage self sealing blowout preventer wellhead packing box of claim 1, wherein the dual control valve controls communication of the balance cavity, the polish rod cavity, and the exterior of the body portion, respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910903788.XA CN110578491B (en) | 2019-09-24 | High-pressure double-stage self-sealing blowout-preventing wellhead packing box |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910903788.XA CN110578491B (en) | 2019-09-24 | High-pressure double-stage self-sealing blowout-preventing wellhead packing box |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110578491A CN110578491A (en) | 2019-12-17 |
| CN110578491B true CN110578491B (en) | 2024-06-28 |
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Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN211623376U (en) * | 2019-09-24 | 2020-10-02 | 江汉油田兴亚工矿配件潜江有限公司 | High-pressure double-stage self-sealing blowout-preventing wellhead packing box |
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN211623376U (en) * | 2019-09-24 | 2020-10-02 | 江汉油田兴亚工矿配件潜江有限公司 | High-pressure double-stage self-sealing blowout-preventing wellhead packing box |
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