CN213360067U - Double-sealing wellhead sealing device - Google Patents
Double-sealing wellhead sealing device Download PDFInfo
- Publication number
- CN213360067U CN213360067U CN202021914683.9U CN202021914683U CN213360067U CN 213360067 U CN213360067 U CN 213360067U CN 202021914683 U CN202021914683 U CN 202021914683U CN 213360067 U CN213360067 U CN 213360067U
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- rotating shaft
- seal
- oil
- sealing
- bearing
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- 238000007789 sealing Methods 0.000 title claims abstract description 78
- 230000000694 effects Effects 0.000 claims abstract description 9
- 230000003068 static effect Effects 0.000 claims abstract description 7
- 230000001360 synchronised effect Effects 0.000 claims abstract description 6
- 239000004519 grease Substances 0.000 claims description 8
- 230000001050 lubricating effect Effects 0.000 claims description 7
- 239000007788 liquid Substances 0.000 claims description 4
- 238000005461 lubrication Methods 0.000 claims description 4
- 238000000034 method Methods 0.000 claims description 4
- 239000003129 oil well Substances 0.000 claims description 4
- 230000009977 dual effect Effects 0.000 claims 7
- 238000011084 recovery Methods 0.000 claims 1
- 238000012423 maintenance Methods 0.000 abstract description 7
- 238000003912 environmental pollution Methods 0.000 abstract description 3
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 238000000605 extraction Methods 0.000 description 5
- 239000012530 fluid Substances 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 238000012856 packing Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 2
- 230000000149 penetrating effect Effects 0.000 description 2
- 230000003014 reinforcing effect Effects 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 210000002445 nipple Anatomy 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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- Sealing Devices (AREA)
- Sealing Using Fluids, Sealing Without Contact, And Removal Of Oil (AREA)
Abstract
The utility model relates to a double containment well head sealing device. The technical scheme is as follows: the rotating shaft is of a hollow structure, and a rubber sealing ring is arranged in the rotating shaft and used for sealing the polished rod; the outer side of the rotating shaft is provided with a bearing, the bearing is assembled with a bearing sleeve, and the outer end of the bearing sleeve is fixedly connected with the shell; in addition, the upper end and the lower end of the rotating shaft are provided with an oil seal seat and an oil seal to form a double-seal structure; the rotating shaft, the output shaft of the ground driving device and the polish rod realize synchronous rotation, and the sealing form of the rubber sealing ring between the polish rod and the rotating shaft is static sealing, so that the bearing capacity is high. The beneficial effects are that: the upper end and the lower end of the rotating shaft of the utility model are respectively provided with the oil seal seat and the oil seal, thereby forming a double-sealing structure and playing a better sealing effect; and the whole structure is compact, the maintenance is simple, and the problem of environmental pollution is reduced or avoided.
Description
Technical Field
The utility model relates to an oil well head sealing device, in particular to double containment well head sealing device.
Background
The screw pump is one kind of rod pump and has wide application in artificial petroleum lift. The screw pump oil production system is a 'ground driving device-polished rod (sucker rod) -screw pump' type rod pumping system, and a wellhead sealing device is required to be installed at the wellhead position. The present commonly used screw pump oil extraction well head sealing device is provided with a mechanical sealing device and a packing sealing device.
The mechanical sealing device has good sealing effect, almost achieves zero leakage, uses precise parts, has higher cost and higher requirement on the working environment, and can reduce the service life and the sealing effect of the mechanical sealing if well fluid contains solids. Once the mechanical sealing device fails, the leakage amount of liquid is relatively large, and the environment is adversely affected. The mechanical sealing device is difficult to maintain on site, and the maintenance difficulty is high.
The packing sealing device has the advantages of simple structure, easy processing and manufacturing, low cost and convenient installation, maintenance and part replacement. In practical application, the inclination of a well head and the out-of-roundness of the polish rod can cause the polish rod to rotate eccentrically, so that the sealing failure of the packing is caused. Therefore, the packing sealing device has the problems of short service cycle and easy leakage to cause environmental pollution.
In view of the foregoing, it is desirable to develop a wellhead sealing device and method that addresses the deficiencies of existing sealing devices.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a double containment well head sealing device to the above-mentioned defect that prior art exists, its simple structure, sealing performance is reliable, long service life, the maintenance degree of difficulty reduces by a wide margin.
The utility model provides a pair of double containment well head sealing device, its technical scheme is: the device comprises a rotating shaft 1, a bearing sleeve 2, a bearing 4, an oil seal seat 5, an oil seal 6, a shell 8 and a rubber seal ring 10, wherein the rotating shaft 1 is of a hollow structure, and the rubber seal ring 10 is arranged in the rotating shaft and used for sealing a polished rod 11; the bearing 4 is arranged on the outer side of the rotating shaft 1, the bearing 4 and the bearing sleeve 2 are assembled together, and the outer end of the bearing sleeve 2 is fixedly connected with the shell 8; in addition, the upper end and the lower end of the rotating shaft 1 are respectively provided with an oil seal seat 5 and an oil seal 6 to form a double-seal structure; the upper portion of the rotating shaft 1 is connected with an output shaft 12 of a ground driving device and synchronously rotates, and a polished rod 11 penetrating into an inner cavity of the rotating shaft 1 and the output shaft 12 of the ground driving device also synchronously rotate through a driving hoop 13, so that in the operation process of the screw pump oil extraction system, the rotating shaft 1, the output shaft 12 of the ground driving device and the polished rod 11 synchronously rotate, and a rubber sealing ring 10 between the polished rod 11 and the rotating shaft 1 is in a static sealing mode, so that the bearing capacity is high.
Preferably, the oil seals 6 at the upper end and the lower end of the rotating shaft 1 are arranged on the oil seal seat 5, grooves are formed in the oil seal seat 5 and the outer circle of the bearing sleeve 2, the grooves are used for installing the O-shaped rings 7, the O-shaped rings 7 are static sealed, and the bearing capacity is high.
Preferably, the cavity of the bearing housing 2 is filled with grease, which can provide lubrication for the bearing 4 and the oil seal 6 on the one hand, and on the other hand, the liquid in the oil well is not easy to leak into the cavity through the oil seal 6, thereby improving the sealing effect of the oil seal 6.
Preferably, the housing 8 is formed with two threaded holes, one of which is used to mount the positioning bolt 3 and the other of which is used to mount the oil nipple or trigger 9.
Preferably, the positioning bolt 3 penetrates through the housing 8 and the bearing sleeve 2 to fasten the housing 8 and the bearing sleeve 2 together, so as to prevent the bearing sleeve 2 from rotating along with the rotating shaft 1.
Preferably, the trigger 9 ejects the cap and exposes the warning mark when the pressure in the housing 8 increases.
Preferably, a cross-shaped groove is formed in an upper portion of the rotary shaft 1, and the rotary shaft is connected to an output shaft 12 of a ground driving device through the cross-shaped groove and rotates synchronously.
Preferably, a sealing ring is arranged between the outer walls of the oil seal seat 5 and the bearing sleeve 2 and the inner cavity of the shell 8.
Compared with the prior art, the beneficial effects of the utility model are specifically as follows:
the upper end and the lower end of the rotating shaft of the utility model are both provided with the oil seal seat and the oil seal, thereby forming a double-seal structure and playing a better sealing effect; in addition, the sealing device of the utility model is provided with the bearing, so that the rotating shaft can rotate stably, the vibration of the rotating shaft is reduced, and the sealing effect of the rotating shaft is improved; moreover, the utility model is also provided with a warning function of the trigger, which can remind the operator to maintain the sealing device in time before the sealing device fails;
in a word, the utility model discloses an overall structure is compact, and maintenance, maintenance are simple, reduce the condition that takes place to reveal, have avoided causing environmental pollution's problem.
Drawings
Fig. 1 is a schematic structural diagram of the present invention;
fig. 2 is an axial view of the main body of the present invention;
FIG. 3 is a schematic illustration of an output shaft of the screw pump ground drive;
FIG. 4 is a schematic view of the present invention connected to a screw pump ground drive;
in the upper diagram: the double-seal type screw pump comprises a rotating shaft 1, a bearing sleeve 2, a positioning bolt 3, a bearing 4, an oil seal seat 5, an oil seal 6, an O-shaped ring 7, a shell 8, a trigger 9, a rubber seal ring 10, a polished rod 11, an output shaft 12, a driving clamp 13, a seal ring 14, a double-seal wellhead sealing device a, a screw pump ground driving device b, a cross groove 1.1 and a reinforcing rib 8.1.
Detailed Description
The preferred embodiments of the present invention will be described in conjunction with the accompanying drawings, and it will be understood that they are presented herein only to illustrate and explain the present invention, and not to limit the present invention.
The oil seals 6 at the upper end and the lower end of the rotating shaft 1 are arranged on the oil seal seat 5, grooves are formed in the oil seal seat 5 and the outer circle of the bearing sleeve 2, the grooves are used for installing the O-shaped rings 7, the O-shaped rings 7 are in static sealing, and the bearing capacity is high.
In the cavity of bearing housing 2, fill with lubricating grease, lubricating grease can provide the lubrication for bearing 4 and oil blanket 6 on the one hand, and on the other hand the liquid in the oil well is difficult for revealing in the cavity through oil blanket 6, improves oil blanket 6's sealed effect.
The shell 8 is provided with two threaded holes, wherein one threaded hole is used for installing the positioning bolt 3, the other threaded hole can be provided with an oil injection nozzle or a trigger 9, in addition, the shell 8 can be formed by casting or welding, a plurality of reinforcing ribs 8.1 are arranged on the outer side of the shell, and the supporting force of the upper end of the shell 8 is improved.
The positioning bolt 3 penetrates through the housing 8 and the bearing sleeve 2 to fasten the housing 8 and the bearing sleeve 2 together, so that the bearing sleeve 2 is prevented from rotating along with the rotating shaft 1.
When the pressure of the trigger 9 in the shell 8 is increased, the cap is ejected out and the warning mark is exposed.
The upper part of the rotating shaft 1 is provided with a cross groove 1.1 which is connected with an output shaft 12 of a ground driving device through the cross groove and rotates synchronously.
And a sealing ring 14 is arranged between the outer walls of the oil seal seat 5 and the bearing sleeve 2 and the inner cavity of the shell 8, so that the sealing effect is improved.
The utility model discloses during the use, including following step:
firstly, a double-sealing wellhead sealing device a is arranged at the bottom of a screw pump ground driving device b, and a rotating shaft 1 of the double-sealing wellhead sealing device is connected with an output shaft 12 of the screw pump ground driving device through a cross groove, so that torque transmission and synchronous rotation are realized;
secondly, the lower end of a double-sealing wellhead sealing device a is connected to an upper flange of the oil production wellhead, and the double-sealing wellhead sealing device a and the upper flange of the oil production wellhead are sealed through a steel ring;
the polish rod 11 penetrates through the rotating shaft 1 of the double-sealing wellhead sealing device and the output shaft 12 of the screw pump ground driving device, and the drive clamp 13 simultaneously clamps the polish rod 11 and the output shaft 12 of the screw pump ground driving device, so that the polish rod 11, the rotating shaft 1 and the output shaft 12 realize synchronous rotation;
thirdly, when the screw pump oil extraction system works normally, an output shaft 12 of the screw pump ground driving device drives a polished rod 11 and a rotating shaft 1 of the double-sealing wellhead sealing device to rotate, the polished rod 11 is connected with a sucker rod, the sucker rod is connected with a screw pump, the screw pump lifts well fluid to a wellhead, and the well fluid with pressure is discharged from a pipeline connected with an oil extraction wellhead; one part of pressure of the well fluid is sealed by a rubber sealing ring 10 between the rotating shaft 1 and the polished rod 11, and the other part of pressure is sealed by an oil seal 6 arranged on the rotating shaft;
fourthly, lubricating grease is injected into the double-seal wellhead sealing device a, on one hand, the lubricating grease can provide lubrication for the oil seal 6 and the bearing 4, on the other hand, the lubricating grease has higher viscosity and large flow resistance, and can prevent pressure from leaking from the oil seal 6 to the inside of the double-seal wellhead sealing device a to a certain extent;
fifthly, a trigger 9 is arranged on a shell 8 of the double-sealed wellhead sealing device, if pressure enters the inside of the double-sealed wellhead sealing device through an oil seal 6, the pressure can push out a cover cap of the trigger 9, so that an operator is reminded that the internal pressure of the double-sealed wellhead sealing device is increased, the oil seal is possibly failed, and the double-sealed wellhead sealing device a needs to be maintained; during maintenance, the rotating shaft 1 is taken out, the oil seal 6 is replaced, and the rotating shaft 1 is installed again.
The above description is only a few of the preferred embodiments of the present invention, and any person skilled in the art may modify the above-described embodiments or modify them into equivalent ones. Therefore, any simple modifications or equivalent replacements made according to the technical solution of the present invention belong to the scope of the claimed invention as far as possible.
Claims (8)
1. A double-seal wellhead sealing device is characterized in that: the oil seal comprises a rotating shaft (1), a bearing sleeve (2), a bearing (4), an oil seal seat (5), an oil seal (6), a shell (8) and a rubber sealing ring (10), wherein the rotating shaft (1) is of a hollow structure, and the rubber sealing ring (10) is arranged in the rotating shaft and used for sealing a polished rod (11); a bearing (4) is arranged on the outer side of the rotating shaft (1), the bearing (4) and the bearing sleeve (2) are assembled together, and the outer end of the bearing sleeve (2) is fixedly connected with the shell (8); in addition, the upper end and the lower end of the rotating shaft (1) are respectively provided with an oil seal seat (5) and an oil seal (6) to form a double-seal structure; the upper portion of rotation axis (1) is connected and synchronous revolution with ground drive arrangement's output shaft (12), and polished rod (11) that penetrates rotation axis (1) inner chamber has also realized synchronous revolution through drive clamp (13) with ground drive arrangement's output shaft (12), like this, screw pump oil recovery system operation in-process, rotation axis (1), ground drive arrangement's output shaft (12), polished rod (11) synchronous revolution, the sealed form of rubber seal (10) between polished rod (11) and rotation axis (1) is static seal, and bearing capacity is strong.
2. The dual seal wellhead seal device according to claim 1 wherein: the oil seals (6) at the upper end and the lower end of the rotating shaft (1) are all arranged on an oil seal seat (5), grooves are machined in the outer circles of the oil seal seat (5) and the bearing sleeve (2), the grooves are used for installing O-shaped rings (7), the sealing forms of the O-shaped rings (7) are static sealing, and the bearing capacity is high.
3. The dual seal wellhead seal device according to claim 1 wherein: in the cavity of bearing housing (2), fill with lubricating grease, lubricating grease can provide the lubrication for bearing (4) and oil blanket (6) on the one hand, and in the cavity is revealed through oil blanket (6) to the difficult liquid in the on the other hand oil well, improves the sealed effect of oil blanket (6).
4. The dual seal wellhead seal device according to claim 1 wherein: the shell (8) is processed with two threaded holes, wherein one threaded hole is used for installing the positioning bolt (3), and the other threaded hole can be used for installing an oil nozzle or a trigger (9).
5. The dual seal wellhead seal device according to claim 4 wherein: the positioning bolt (3) penetrates through the shell (8) and the bearing sleeve (2) to fasten the shell (8) and the bearing sleeve (2) together, so that the bearing sleeve (2) is prevented from rotating along with the rotating shaft (1).
6. The dual seal wellhead seal device according to claim 4 wherein: when the pressure in the shell (8) is increased, the trigger (9) ejects the cap and exposes the warning mark.
7. The dual seal wellhead seal device according to claim 1 wherein: the upper part of the rotating shaft (1) is provided with a cross groove, and the rotating shaft is connected with an output shaft (12) of a ground driving device through the cross groove and synchronously rotates.
8. The dual seal wellhead seal device according to claim 1 wherein: and a sealing ring is arranged between the outer walls of the oil seal seat (5) and the bearing sleeve (2) and the inner cavity of the shell (8).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021914683.9U CN213360067U (en) | 2020-09-04 | 2020-09-04 | Double-sealing wellhead sealing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021914683.9U CN213360067U (en) | 2020-09-04 | 2020-09-04 | Double-sealing wellhead sealing device |
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| Publication Number | Publication Date |
|---|---|
| CN213360067U true CN213360067U (en) | 2021-06-04 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202021914683.9U Active CN213360067U (en) | 2020-09-04 | 2020-09-04 | Double-sealing wellhead sealing device |
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| Country | Link |
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| CN (1) | CN213360067U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112177553A (en) * | 2020-09-04 | 2021-01-05 | 山东威德福高原人工举升装备有限公司 | Double-seal wellhead sealing device and method |
-
2020
- 2020-09-04 CN CN202021914683.9U patent/CN213360067U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112177553A (en) * | 2020-09-04 | 2021-01-05 | 山东威德福高原人工举升装备有限公司 | Double-seal wellhead sealing device and method |
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