CN213087947U - Wellhead metal sealing device - Google Patents
Wellhead metal sealing device Download PDFInfo
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- CN213087947U CN213087947U CN202020897188.5U CN202020897188U CN213087947U CN 213087947 U CN213087947 U CN 213087947U CN 202020897188 U CN202020897188 U CN 202020897188U CN 213087947 U CN213087947 U CN 213087947U
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Abstract
The utility model discloses a well head metal seal device belongs to oil recovery technical field. The device provided by the disclosure is arranged on a wellhead of an injection and production well, when the injection and production well is normally produced, the sealing plunger assembly completes reciprocating motion of an upper stroke and a lower stroke in the sealing pipe assembly along with a polished rod, but due to the existence of a sealing surface, liquid in the second cavity cannot be discharged into the first cavity normally, when an oil sleeve of the injection and production well is communicated due to leakage or faults, liquid may be discharged into the first cavity from the second cavity, due to the fact that the sealing pipe assembly corresponding to the first cavity is provided with the liquid discharge hole, the liquid discharged into the first cavity can be timely discharged through the liquid discharge hole, the first cavity is ensured to be in a normal pressure state, no liquid is upwards discharged into a packing or polished rod blowout preventer through the first cavity, and the phenomenon that oil, gas and water are leaked from the wellhead of the injection and production well is ensured.
Description
Technical Field
The utility model relates to an oil recovery technical field, in particular to well head metal seal device.
Background
The top of a rod pumped well has a polished rod, and a wellhead seal is typically required at the wellhead to seal. The well head sealing device commonly used at present is a packing box, a packing is arranged in the packing box and sleeved on a polished rod, and therefore the well head sealing device plays a role in sealing the polished rod.
However, because the polish rod needs to move up and down in the working process, the wellhead sealing device is limited by the structure and the material, and the contact part of the wellhead sealing device and the polish rod is easy to wear to generate a gap, so that oil, gas and water are leaked.
SUMMERY OF THE UTILITY MODEL
The embodiment of the disclosure provides a wellhead metal sealing device, which can solve the problem that the existing common wellhead sealing device is limited by structures and materials, is easy to wear and generate gaps with a polished rod contact part, and generates oil, gas and water leakage. The technical scheme is as follows:
there is provided a wellhead metal sealing device, the device comprising: a sealing plunger assembly and a sealing tube assembly;
the sealing plunger assembly is positioned in the sealing pipe assembly and can slide up and down;
a sealing surface is formed between the outer wall of the sealing plunger assembly and the inner wall of the sealing tube assembly, so that the space between the outer wall of the sealing plunger assembly and the inner wall of the sealing tube assembly is divided into a first cavity and a second cavity, and the first cavity is positioned above the second cavity;
the top of the sealing plunger assembly is used for connecting a polished rod, and the bottom of the sealing plunger assembly is used for connecting an injection and production rod column;
the top of the sealed pipe assembly is used for connecting a packing box or a polished rod blowout preventer, and the sealed pipe assembly is provided with a liquid discharge hole which is positioned outside the first cavity.
In one possible design, the drain hole is connected to the vent line via a drain pipe.
In one possible design, the sealed plunger assembly includes: the upper sucker rod coupling, the upper sealing plunger upper joint, the sealing plunger body, the lower sealing plunger lower joint and the lower sucker rod coupling are connected in sequence;
the top of the upper sucker rod coupling is used for connecting a polished rod, and the bottom of the lower sucker rod coupling is used for connecting an injection production rod column.
In one possible design, the upper sucker rod coupling, the upper sealing plunger upper joint, the sealing plunger body, the lower sealing plunger lower joint and the lower sucker rod coupling are connected by screw threads.
In one possible design, the gland assembly includes: the reducing pipe nipple, the lengthening pipe, the sealing pipe joint, the sealing pipe body and the positioning nut are connected in sequence;
the top of the reducing nipple is used for connecting a packing box or a polish rod blowout preventer, and a liquid discharge hole is formed in the reducing nipple.
In a possible design, the reducing nipple, the lengthening pipe, the sealing pipe joint, the sealing pipe body and the positioning nut are connected in a threaded manner.
In a possible design, the outer diameter of the sealing plunger body is smaller than the inner diameter of the extension pipe, so that the first cavity is formed among the reducing nipple, the extension pipe, the sealing pipe joint, the sealing pipe body and the sealing plunger body.
In a possible design, the second cavity is formed among the reducing nipple, the extension pipe, the sealing pipe joint, the sealing pipe body, the positioning nut, the sealing plunger body, the well head wall, the injection-production pipe column and the injection-production pump.
In one possible design, the sealing surface is formed between an outer wall of the sealing plunger body and an inner wall of the sealing tube body.
In a possible design, the bottom of the reducing nipple is connected with a hoop head through external threads, and the hoop head is connected with the hoop and hung at the four-way oil production joint of a wellhead through the hoop.
The device provided by the disclosure is arranged on a wellhead of an injection and production well, when the injection and production well is normally produced, the sealing plunger assembly completes reciprocating motion of an upper stroke and a lower stroke in the sealing pipe assembly along with a polished rod, but due to the existence of a sealing surface, liquid in the second cavity cannot be discharged into the first cavity normally, when an oil sleeve of the injection and production well is communicated due to leakage or faults, liquid may be discharged into the first cavity from the second cavity, due to the fact that the sealing pipe assembly corresponding to the first cavity is provided with the liquid discharge hole, the liquid discharged into the first cavity can be timely discharged through the liquid discharge hole, the first cavity is ensured to be in a normal pressure state, no liquid is upwards discharged into a packing or polished rod blowout preventer through the first cavity, and the phenomenon that oil, gas and water are leaked from the wellhead of the injection and production well is ensured.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present disclosure, and it is obvious for those skilled in the art to obtain other drawings based on the drawings without creative efforts.
FIG. 1 is a schematic structural view of a wellhead metal sealing device provided by the disclosed embodiment;
FIG. 2 is a schematic view of an installation structure of a wellhead metal sealing device provided by the embodiment of the disclosure;
FIG. 3 is a schematic structural diagram of a seal plunger assembly 1 in a wellhead metal seal device according to an embodiment of the present disclosure;
fig. 4 is a schematic structural diagram of a seal tube assembly 2 in a wellhead metal sealing device provided by an embodiment of the present disclosure.
The various reference numbers in the drawings are illustrated below:
1-a sealed plunger assembly;
11-pumping rod coupling, 12-sealing plunger upper joint, 13-sealing plunger body, 14-sealing plunger lower joint and 15-pumping rod coupling;
2-a sealed tube assembly;
21-a liquid discharge hole, 22-a reducing short section, 23-an extension pipe, 24-a sealing pipe joint, 25-a sealing pipe body and 26-a positioning nut;
3-packing box, 4-polished rod blowout preventer, 5-oil pipe nipple, 6-oil pipe, 7-polished rod, 8-hoop head, and 9-oil extraction cross;
101-a first cavity, 102-a second cavity;
31-a drain pipe, 32-an air release valve, 33-an injection and production rod column, 34-a flange plate, 35-an oil pipe hanger, 36-a large four-way joint, 37-a casing head and 38-a casing.
Detailed Description
To make the objects, technical solutions and advantages of the present disclosure more apparent, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings.
Fig. 1 is a schematic structural diagram of a wellhead metal sealing device provided by an embodiment of the present disclosure, and fig. 2 is a schematic structural diagram of an installation of the wellhead metal sealing device provided by an embodiment of the present disclosure, please refer to fig. 1 and fig. 2, the device includes: a sealing plunger assembly 1 and a sealing tube assembly 2; the sealing plunger assembly 1 is positioned in the sealing tube assembly 2, and the sealing plunger assembly 1 can slide up and down; a sealing surface is formed between the outer wall of the sealing plunger assembly 1 and the inner wall of the sealing tube assembly 2, so that the space between the outer wall of the sealing plunger assembly 1 and the inner wall of the sealing tube assembly 2 is divided into a first cavity 101 and a second cavity 102, and the first cavity 101 is positioned above the second cavity 102; the top of the sealing plunger assembly 1 is used for connecting a polished rod 7, and the bottom of the sealing plunger assembly 1 is used for connecting an injection and production rod column 33; the top of the gland assembly 2 is used for connecting a packing box 3 or a polished rod blowout preventer 4, and the gland assembly 2 is provided with a drain hole 21, and the drain hole 21 is positioned outside the first cavity 101.
The working principle of the wellhead metal sealing device provided by the embodiment of the disclosure is detailed as follows:
the injection and production well can be divided into a sucker rod pump water injection well and a pumping unit oil production well, and for the pumping unit oil production well, the wellhead metal sealing device can be installed on the lower part of the conventional packing box 3 and can be connected through threads. For sucker rod pump injection wells, the wellhead metal seal can be mounted on the lower portion of the polished rod blowout preventer 4 and can be connected by a clamp.
The packing box 3 and the polished rod blowout preventer 4 are connected through an oil pipe nipple 5, and the wellhead metal sealing device is positioned at the lower parts of the packing box 3 and the polished rod blowout preventer 4 and can be connected through a clamping hoop, as shown in figure 2.
The device provided by the disclosure is arranged on the wellhead of the injection and production well, when the injection and production well is normally produced, the sealing plunger assembly 1 completes reciprocating motion of up and down strokes in the sealing pipe assembly 2 along with the polished rod 7, but due to the existence of a sealing surface, liquid in the second cavity 102 cannot be discharged into the first cavity 101 generally, when an oil jacket of the injection and production well is communicated due to leakage or failure, liquid may be discharged into the first cavity 101 from the second cavity 102, and due to the fact that the sealing pipe assembly 2 corresponding to the first cavity 101 is provided with the liquid discharge hole 21, the liquid discharged into the first cavity 101 can be timely discharged through the liquid discharge hole 21, the first cavity 101 is ensured to be in a normal pressure state, no liquid is upwards discharged into the packing or polished rod blowout preventer 4 through the first cavity 101, and the wellhead of the injection and production well is ensured not to have oil-gas-water leakage.
When an abnormal condition occurs in a water injection well of the sucker-rod pump system, for example, in the water injection process, the oil jacket is communicated due to reasons such as failure of a special water injection pump valve, breakage of the oil pipe 6, and piercing and leaking of a pipe column thread, the pressure in the oil pipe 6 is suddenly increased, the liquid amount of the second cavity 102 leaking from a sealing surface to the first cavity 101 is increased compared with that during normal water injection, and the first cavity 101 is also in a non-pressure state in the oil jacket communication state because the liquid is timely discharged through the liquid discharge hole 21; meanwhile, the weight of the underground weighting rod can completely offset the upward jacking force of the wellhead liquid on the sealing plunger assembly 1, and the sealing plunger assembly 1 cannot move upwards, so that the device can perform real-time wellhead control, the polished rod blowout preventer 4 can be closed in any time period, wellhead two-stage control is realized, and safety accidents of the rod pump water injection well are avoided.
The following describes the structure and the working principle of the device:
in one possible design, the drain hole 21 is connected to a vent line through the drain pipe 31, so that the liquid in the drain pipe 31 can be smoothly drained through the vent line. In one possible design, the drain pipe 31 is also provided with a blow-off valve 32, by means of which blow-off valve 32 the discharge of liquid from the drain pipe 31 can be controlled.
Fig. 3 is a schematic structural diagram of a seal plunger assembly 1 in a metal seal device at a wellhead, please refer to fig. 3, in a possible design, the seal plunger assembly 1 includes: an upper sucker rod coupling 11, a sealing plunger upper joint 12, a sealing plunger body 13, a sealing plunger lower joint 14 and a lower sucker rod coupling 15 which are connected in sequence; the top of the upper sucker rod coupling 11 is used for connecting the polished rod 7, and the bottom of the lower sucker rod coupling 15 is used for connecting the injection and production rod 33, so that the sealing plunger is connected with the polished rod 7 and the injection and production rod 33 into a whole.
Wherein, the upper part of the upper sucker rod coupling 11 is in threaded connection with the lower part of the polished rod 7, and the lower part of the upper sucker rod coupling 11 is in threaded connection with the upper sealing plunger upper joint 12, thereby facilitating the disassembly and the installation.
In one possible design, the upper sucker rod coupling 11, the upper sealing plunger coupling 12, the sealing plunger body 13, the lower sealing plunger coupling 14 and the lower sucker rod coupling 15 are connected by screw threads, and the screw threads are convenient to detach and install.
Fig. 4 is a schematic structural diagram of a seal tube assembly 2 in a wellhead metal sealing device according to an embodiment of the present disclosure, please refer to fig. 4, in a possible design, the seal tube assembly 2 includes: the reducing pipe nipple 22, the lengthening pipe 23, the sealing pipe joint 24, the sealing pipe body 25 and the positioning nut 26 are connected in sequence; the top of this reducing nipple 22 is used for connecting packing box 3 or polished rod preventer 4, has outage 21 on this reducing nipple 22 to make the liquid that flows into reducing nipple 22 can in time get rid of through outage 21, thereby no longer have the high pressure in the first cavity 101, can no longer cause pressure to packing box 3 or polished rod preventer 4, and liquid also can not be again because the blowout in high pressure follow packing box 3 or polished rod preventer 4, thereby can not take place the incident again.
In a possible design, the reducing nipple 22, the extension pipe 23, the sealing pipe joint 24, the sealing pipe body 25 and the positioning nut 26 are connected by threads, and the threads are convenient to detach and mount. The extension pipe 23, the sealing pipe joint 24, the sealing pipe body 25 and the positioning nut 26 are sequentially provided with a flange 34, an oil pipe hanger 35, a large four-way joint 36, a casing head 37 and a casing 38 from top to bottom.
In a possible design, the outer diameter of the sealing plunger body 13 is smaller than the inner diameter of the extension pipe 23, so that the first cavity 101 is formed between the reducing nipple 22, the extension pipe 23, the sealing pipe joint 24, the sealing pipe body 25 and the sealing plunger body 13, and the first cavity 101 can contain the liquid flowing from the second cavity 102, and the liquid can be discharged from the liquid discharge hole 21 in time, thereby ensuring that the first cavity 101 is in a normal pressure state.
In one possible design, the second cavity 102 is formed between the reducing nipple 22, the extension pipe 23, the sealing nipple 24, the sealing pipe body 25, the positioning nut 26, the sealing plunger body 13, the well head wall, the injection-production string and the injection-production pump.
In a production well, the pressure within the second chamber 102 does not substantially change; in the water injection well, the pressure in the second cavity 102 changes along with the change of the water supply pressure during normal water injection, and the pressure in the second cavity 102 changes along with the change of the formation pressure during oil jacket communication.
In one possible design, the sealing surface is formed between the outer wall of the sealing plunger body 13 and the inner wall of the sealing tube body 25, and the sealing surface is a metal sealing surface and is relatively wear-resistant, so that the service life of the device can be further prolonged.
In one possible design, the bottom of the reducing nipple 22 is connected with a collar 8 by means of external threads, and the collar 8 is connected with the collar and suspended by means of the collar at the production cross 9 of the wellhead, so as to position the device at the wellhead.
All the above optional technical solutions may be combined arbitrarily to form the optional embodiments of the present disclosure, and are not described herein again.
The above description is only exemplary of the present disclosure and is not intended to limit the present disclosure, so that any modification, equivalent replacement, or improvement made within the spirit and principle of the present disclosure should be included in the scope of the present disclosure.
Claims (10)
1. A wellhead metal sealing device, characterized in that the device comprises: a sealing plunger assembly (1) and a sealing tube assembly (2);
the sealing plunger assembly (1) is positioned in the sealing tube assembly (2), and the sealing plunger assembly (1) can slide up and down;
a sealing surface is formed between the outer wall of the sealing plunger assembly (1) and the inner wall of the sealing tube assembly (2), so that the space between the outer wall of the sealing plunger assembly (1) and the inner wall of the sealing tube assembly (2) is divided into a first cavity (101) and a second cavity (102), and the first cavity (101) is positioned above the second cavity (102);
the top of the sealing plunger assembly (1) is used for connecting a polished rod (7), and the bottom of the sealing plunger assembly (1) is used for connecting an injection and production rod column (33);
the top of the sealing pipe assembly (2) is used for being connected with a packing box (3) or a polish rod blowout preventer (4), a liquid discharge hole (21) is formed in the sealing pipe assembly (2), and the liquid discharge hole (21) is located outside the first cavity (101).
2. Device according to claim 1, characterized in that the drain hole (21) is connected to a blow line via a drain pipe (31).
3. The device according to claim 1, wherein the sealing plunger assembly (1) comprises: an upper sucker rod coupling (11), a sealing plunger upper joint (12), a sealing plunger body (13), a sealing plunger lower joint (14) and a lower sucker rod coupling (15) which are connected in sequence;
the top of the upper sucker rod coupling (11) is used for connecting a polished rod (7), and the bottom of the lower sucker rod coupling (15) is used for connecting an injection-production rod column (33).
4. The device according to claim 3, characterized in that the upper sucker rod coupling (11), the upper sealing plunger nipple (12), the sealing plunger body (13), the lower sealing plunger nipple (14) and the lower sucker rod coupling (15) are connected by screw threads.
5. The device according to claim 3, characterized in that said sealing-tube assembly (2) comprises: the pipe sealing device comprises a reducing short section (22), an extension pipe (23), a sealing pipe joint (24), a sealing pipe body (25) and a positioning nut (26) which are connected in sequence;
the top of the reducing nipple (22) is used for connecting a packing box (3) or a polish rod blowout preventer (4), and a liquid discharge hole (21) is formed in the reducing nipple (22).
6. The device according to claim 5, characterized in that the reducing nipple (22), the extension pipe (23), the sealing pipe joint (24), the sealing pipe body (25) and the positioning nut (26) are connected by threads.
7. The device according to claim 5, characterized in that the outer diameter of the sealing plunger body (13) is smaller than the inner diameter of the extension tube (23) so that the first cavity (101) is formed between the reducing nipple (22), the extension tube (23), the sealing tube joint (24), the sealing tube body (25) and the sealing plunger body (13).
8. The device according to claim 5, characterized in that the second cavity (102) is formed between the reducing nipple (22), the extension tube (23), the sealing pipe joint (24), the sealing pipe body (25), the positioning nut (26), the sealing plunger body (13), a wellhead wall, a production string and a production pump.
9. A device according to claim 5, characterized in that the sealing surface is formed between the outer wall of the sealing plunger body (13) and the inner wall of the sealing tube body (25).
10. The device according to claim 5, characterized in that the bottom of the reducing nipple (22) is connected with a clamp head (8) through external threads, and the clamp head (8) is connected with the clamp and suspended at the production cross (9) of the wellhead through the clamp.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020897188.5U CN213087947U (en) | 2020-05-25 | 2020-05-25 | Wellhead metal sealing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020897188.5U CN213087947U (en) | 2020-05-25 | 2020-05-25 | Wellhead metal sealing device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN213087947U true CN213087947U (en) | 2021-04-30 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020897188.5U Active CN213087947U (en) | 2020-05-25 | 2020-05-25 | Wellhead metal sealing device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN213087947U (en) |
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2020
- 2020-05-25 CN CN202020897188.5U patent/CN213087947U/en active Active
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