CN212054614U - Tail pipe composite rubber plug - Google Patents
Tail pipe composite rubber plug Download PDFInfo
- Publication number
- CN212054614U CN212054614U CN202020277875.7U CN202020277875U CN212054614U CN 212054614 U CN212054614 U CN 212054614U CN 202020277875 U CN202020277875 U CN 202020277875U CN 212054614 U CN212054614 U CN 212054614U
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- Prior art keywords
- rubber plug
- ball seat
- sleeve
- plug
- connecting sleeve
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Abstract
The utility model discloses a compound plug of tail pipe belongs to in the oil field exploitation, well cementation equipment technical field, including inside be equipped with the through-hole and respectively on the plug, joint and the intercommunication sleeve pipe that the lower extreme is connected, be provided with the ball seat in the adapter sleeve, the outside coaxial protective case that is provided with of plug, set up the cement pit on the adapter sleeve pipe that is located the ball seat below, the second is cut the round pin and is passed the cement pit, and its one end and protective case connected, the other end and extension union coupling, the other end and the ball seat bottom of extension are connected, the protective case is cut the pin through the third and is connected with intercommunication bushing, still be provided with the spacer pin on the adapter sleeve pipe that is located the. The device is simple in structure, when the rubber plug is put into a well, the rubber plug is placed in the protective sleeve to avoid the extension of the rubber plug from being damaged by external burrs and the like, the protective sleeve is separated from the well after the rubber plug is put into a target position, the setting is realized, and the setting is tight.
Description
Technical Field
The utility model belongs to the technical field of well completion, cementing equipment in the oil field exploitation specifically are compound plug of tail pipe.
Background
The liner cementing method is to cement the casing in the well, and the casing string is the liner, and the liner is usually sent with drill pipe and taken out after cement is injected. The method can save steel and cement and reduce the grade and wall thickness of the selected casing steel. The new technology is widely adopted for cementing wells abroad at present. Liner cementing currently uses a liner hanger suspension method. When conventionally implementing tail pipe operation, the tail pipe plug is hung to the lower part of the central rod of the tail pipe hanger, the lower part of the hanger is connected with a ball seat matched with the tail pipe plug for use, the structure is complex, the installation is inconvenient, Chinese patent CN201120153058.1 discloses a tail pipe composite plug with a simple structure, the manufacturing cost is greatly reduced, but the extension of the plug part in the process of going down the well cannot be avoided colliding with the pipe wall, when the inner wall of the sleeve is burred, the extension is easily cut, thereby the sealing performance is influenced, the setting failure is caused, and the underground operation is influenced.
SUMMERY OF THE UTILITY MODEL
In order to solve the defects of the prior art, the utility model provides a tail pipe composite rubber plug, which can prevent the rubber plug from being damaged in the protection cylinder in the process of going into the well.
The technical scheme of the utility model is realized through following measure:
a tail pipe composite rubber plug comprises a rubber plug, a joint and a communicating sleeve, wherein the lower end of the rubber plug is connected with the connecting sleeve, the upper end of the rubber plug is connected with the joint through a first shearing pin, through holes are formed in the rubber plug and the connecting sleeve, a ball seat is arranged in the connecting sleeve, the outer wall of the ball seat is in sealing fit with the inner wall of the connecting sleeve, a through hole with a wide upper part and a narrow lower part is formed in the ball seat, a protective sleeve is coaxially arranged outside the rubber plug, a cement groove is formed in the connecting sleeve below the ball seat, and the length of; the bottom of the ball seat is connected with one end of an extension pipe, the length of the extension pipe is not less than the height of the cement groove, the other end of the extension pipe is connected with a second shearing pin, the second shearing pin penetrates through the cement groove, and the other end of the second shearing pin is connected with the protective sleeve, so that the protective sleeve, the second shearing pin, the extension pipe and the ball seat are connected into a whole; the protective sleeve is connected with the communicating sleeve through a third shearing pin, and a limiting pin is further arranged on the connecting sleeve below the cement tank.
Preferably, the ball seat is provided with a sealing groove in the outside, and a sealing ring is fixedly installed in the sealing groove.
Preferably, the lower end of the rubber plug is connected with the connecting sleeve through threads; an annular boss is arranged in the joint, and a sealing ring is arranged between the side wall of the annular boss and the opening at the upper end of the rubber plug.
The utility model discloses a use method as follows:
(1) connecting the composite rubber plug with the lower end of a center rod of a tail pipe hanger through a joint, and then putting the connected composite rubber plug into a well; preparing a ball body matched with the inner hole of the ball seat, and putting the ball body into the ball seat to enable the ball to block the ball hole in the center of the ball seat.
(2) And injecting fluid into the center rod to suppress the pressure to the first pressure, so that the third shearing pin is cut off, and the ball seat, the extension pipe, the second shearing pin and the protective sleeve move the whole body downwards along the cement tank to enable the second shearing pin to slide to the bottom of the cement tank, so that the rubber plug is exposed finally.
(3) And continuing to suppress the pressure to a second pressure, so that the rubber plug is expanded and set.
(4) And continuing to suppress the pressure to a third pressure to cut off the third shearing pin, moving the ball seat downwards until the bottom of the ball seat contacts the limiting pin, and then enabling the cement groove to be located above the ball seat, conveying cement through the center rod on the upper portion of the ball seat, injecting the cement through the cement groove, and implementing water injection well cementation operation.
Compared with the prior art, the beneficial effects of the utility model are as follows:
the utility model has simple structure and convenient manufacture; when the rubber plug is placed in the protective sleeve, the rubber plug is prevented from being damaged by external burrs and the like, the protective sleeve is separated from the target position and then is set, and the setting is tight.
Drawings
FIG. 1 is a schematic view of the overall structure of the present invention;
in the figure, 1, a rubber plug; 2. a joint; 3. a communicating sleeve; 4. a first shear pin; 5. a ball seat; 6. a cement tank; 7. protecting the sleeve; 8. an extension pipe; 9. a spacing pin; 10. a seal ring;
21. an annular boss; 42. a second shear pin; 43. and a third shear pin.
Detailed Description
The present invention will be described in further detail with reference to the following examples and drawings, but the present invention is not limited thereto.
In the description of the present invention, it should be noted that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and should not be construed as limiting the present invention.
Example (b):
a tail tube composite rubber plug comprises a rubber plug 1, a joint 2 and a communicating sleeve 3, wherein the lower end of the rubber plug 1 is connected with a connecting sleeve 3, the upper end of the rubber plug 1 is connected with the joint 2 through a first shear pin 4, through holes are formed in the rubber plug 1 and the connecting sleeve 3, a ball seat 5 is arranged in the connecting sleeve 3, the outer wall of the ball seat 5 is in sealing fit with the inner wall of the connecting sleeve 3, the ball seat 5 is internally provided with a through hole which is wide at the top and narrow at the bottom, a protective sleeve 7 is coaxially arranged outside the rubber plug 1, a cement groove 6 is formed in the connecting sleeve 3 below the ball seat 5, and the length of; the bottom of the ball seat 5 is connected with one end of an extension pipe 8, the length of the extension pipe 8 is not less than the height of the cement groove 6, the other end of the extension pipe 8 is connected with a second shearing pin 42, the second shearing pin 42 penetrates through the cement groove 6, and the other end of the second shearing pin 42 is connected with the protective sleeve 7, so that the protective sleeve 7, the second shearing pin 42, the extension pipe 8 and the ball seat 5 are connected into a whole; the protective sleeve 7 is connected with the communicating sleeve 3 through a third shearing pin 43, and the connecting sleeve 3 below the cement groove 6 is also provided with a limiting pin 9.
In order to enhance the sealing effect of the device, a sealing groove is arranged outside the ball seat 5, and a sealing ring 10 is fixedly arranged in the sealing groove; the lower end of the rubber plug 1 is connected with the connecting sleeve 3 through threads; an annular boss 21 is arranged in the joint 2, and a sealing ring 10 is also arranged between the side wall of the annular boss 21 and the opening at the upper end of the rubber plug 1.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the embodiments of the present invention are all covered by the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (3)
1. A tail tube composite rubber plug comprises a rubber plug, a joint and a communicating sleeve, wherein the lower end of the rubber plug is connected with the connecting sleeve, the upper end of the rubber plug is connected with the joint through a first shearing pin, through holes are arranged in the rubber plug and the connecting sleeve, a ball seat is arranged in the connecting sleeve, the outer wall of the ball seat is in sealing fit with the inner wall of the connecting sleeve, a through hole with a wide upper part and a narrow lower part is arranged in the ball seat,
a protective sleeve is coaxially arranged outside the rubber plug, a cement groove is arranged on the connecting sleeve below the ball seat, and the length of the cement groove is not less than that of the rubber plug; the bottom of the ball seat is connected with one end of an extension pipe, the length of the extension pipe is not less than the height of the cement groove, the other end of the extension pipe is connected with a second shearing pin, the second shearing pin penetrates through the cement groove, and the other end of the second shearing pin is connected with the protective sleeve, so that the protective sleeve, the second shearing pin, the extension pipe and the ball seat are connected into a whole; the protective sleeve is connected with the communicating sleeve through a third shearing pin, and a limiting pin is further arranged on the connecting sleeve below the cement tank.
2. The liner composite rubber plug as claimed in claim 1, wherein the ball seat is provided with a sealing groove at the outside thereof, and a sealing ring is fixedly installed in the sealing groove.
3. The liner composite rubber plug as claimed in claim 1, wherein the lower end of the rubber plug is connected with the connecting sleeve by screw thread; an annular boss is arranged in the joint, and a sealing ring is arranged between the side wall of the annular boss and the upper end opening of the rubber plug.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020277875.7U CN212054614U (en) | 2020-03-09 | 2020-03-09 | Tail pipe composite rubber plug |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020277875.7U CN212054614U (en) | 2020-03-09 | 2020-03-09 | Tail pipe composite rubber plug |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212054614U true CN212054614U (en) | 2020-12-01 |
Family
ID=73532976
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020277875.7U Active CN212054614U (en) | 2020-03-09 | 2020-03-09 | Tail pipe composite rubber plug |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN212054614U (en) |
-
2020
- 2020-03-09 CN CN202020277875.7U patent/CN212054614U/en active Active
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| GR01 | Patent grant | ||
| GR01 | Patent grant |