CN115726727A - Precision control pressure well cementing lower rubber plug - Google Patents
Precision control pressure well cementing lower rubber plug Download PDFInfo
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- CN115726727A CN115726727A CN202110981968.7A CN202110981968A CN115726727A CN 115726727 A CN115726727 A CN 115726727A CN 202110981968 A CN202110981968 A CN 202110981968A CN 115726727 A CN115726727 A CN 115726727A
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- structural member
- rubber plug
- well cementation
- control pressure
- lower rubber
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- 238000010008 shearing Methods 0.000 claims abstract description 7
- 238000007789 sealing Methods 0.000 claims description 19
- 238000010276 construction Methods 0.000 abstract description 10
- 230000000694 effects Effects 0.000 abstract description 4
- 239000012530 fluid Substances 0.000 abstract description 2
- 239000002002 slurry Substances 0.000 description 22
- 239000004568 cement Substances 0.000 description 15
- 238000005553 drilling Methods 0.000 description 9
- 239000000243 solution Substances 0.000 description 9
- 238000000034 method Methods 0.000 description 8
- 230000002411 adverse Effects 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 238000013040 rubber vulcanization Methods 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
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Abstract
The invention belongs to the technical field of underground energy exploration and development well engineering, and particularly relates to a precise control pressure well cementation lower rubber plug, aiming at solving the problems that the rupture pressure of a film type well cementation lower rubber plug is unstable and easy to rupture in advance to influence the well cementation quality in the prior art. The precise control pressure well cementation lower rubber plug comprises a first structural member, a second structural member and a third structural member, wherein the second structural member and the third structural member are sleeved outside the first structural member in sequence; the third structural member and the second structural member are both tubular structures, the first structural member is a columnar structure, the first structural member and the second structural member are connected through the shearing member, when the shearing member is sheared, the first structural member falls to the supporting portion, and the supporting portion is vertically provided with a plurality of through holes, so that fluid circulates and well cementation construction operation is completed. The precisely controlled pressure well cementing lower rubber plug can completely replace the traditional film well cementing lower rubber plug, and has accurate pressure control and good field use effect.
Description
Technical Field
The invention belongs to the technical field of underground energy exploration and development well engineering, and particularly relates to a precision-control pressure well cementation lower rubber plug.
Background
The well cementation rubber plug is an indispensable well cementation accessory in the conventional casing pipe setting well cementation construction operation of an oil gas well, and is divided into a well cementation upper rubber plug and a well cementation lower rubber plug which are generally matched and used in pairs. The invention relates to a well cementation lower rubber plug with precisely controlled pressure, which is the well cementation lower rubber plug.
The cementing lower rubber plug is placed on the drilling mud and below the cementing cement slurry in the cementing construction process. The function is as follows: the cement slurry is used for isolating the drilling slurry and the well cementation cement slurry, the drilling slurry is arranged below a well cementation lower rubber plug, and the well cementation cement slurry is arranged above the well cementation lower rubber plug, so that the mixing of the drilling slurry and the well cementation cement slurry is prevented from being generated; and secondly, the drilling mud on the inner wall of the casing is scraped by the aid of the cementing lower rubber plug, and is completely pushed into an annulus outside the casing, so that the drilling mud is prevented from being mixed into the cementing cement slurry to generate mixing propeller, and the quality of cementing is necessarily influenced once the mixing propeller is generated. After the well cementation lower rubber plug is transported to the well bottom, the well cementation lower rubber plug is located on a collision pressure ring which is arranged in advance on the lower portion of the pipe string, under the action of pump pressure and the pressure of a well cementation cement slurry liquid column, a core plug in the middle of the well cementation lower rubber plug falls off, circulation displacement is continued, and the well cementation cement slurry is displaced to an annular space between a well hole and a casing.
At present, the lower rubber plug for well cementation used on site is mostly in a film type, but the rupture pressure of the film is difficult to control. The rupture pressure is not the same for the same film thickness: 1. bubbles, holes and cracks may be generated in the process of vulcanizing rubber, and in addition, the rupture pressure of the film is difficult to control in a small range due to the human factors of technical workers; 2. the different diameters of the circulation holes have different burst pressures. This causes the film type cementing plug to move down to a certain middle position in the cementing construction process and sometimes to break in advance, the cementing cement slurry passes through the cementing plug and is mixed with the drilling mud, the cementing quality is affected, and the cementing quality is unqualified; sometimes, the pressure is suddenly increased after the rubber plug is located on the collision compression ring under well cementation, and potential safety hazards are brought.
Disclosure of Invention
In order to solve the problems in the prior art, namely to solve the problems that the rupture pressure of a rubber plug is unstable and the rubber plug is easy to rupture in advance to influence the well cementation quality in the prior art, the application provides a precise control pressure well cementation lower rubber plug which comprises a first structural member, a second structural member and a third structural member, wherein the second structural member and the third structural member are sequentially sleeved outside the first structural member, and the first structural member, the second structural member and the third structural member are coaxially arranged; the third structural member and the second structural member are both tubular structures, and the first structural member is a columnar structure;
the first structural member is connected with the second structural member through a first connecting piece, the second structural member is fixed at the top of the third structural member, the length of the first structural member is far smaller than that of the third structural member, a supporting part is arranged at the bottom of an inner cavity of the third structural member, the radial section of the supporting part is larger than that of the second structural member, and the vertical distance between the top surface of the supporting body and the bottom surface of the second structural member is larger than that of the first structural member;
when the first connecting piece is under the action of shearing force, the first structural member falls to the supporting part, a plurality of through holes are vertically arranged on the supporting part and are uniformly distributed along the outer edge of the first structural member, and the distance from the axis of the through holes to the axis of the third structural member is greater than the distance from the outer edge of the first structural member to the axis of the third structural member.
In some preferred technical solutions, the third structural member includes a support body and a rubber plug body sleeved outside the support body, end surfaces of the support body and the rubber plug body close to each other are respectively provided with a first assembling portion and a second assembling portion, and when the rubber plug body is sleeved outside the support body, the first assembling portion and the second assembling portion are matched.
In some preferred technical schemes, the first assembling portions are uniformly arranged along the length direction of the support body, and the second assembling portions are uniformly arranged along the length direction of the rubber plug body.
In some preferred embodiments, the support and the plug body are vulcanized together.
In some preferred technical solutions, the second structural member and the third structural member are connected by a screw thread.
In some preferred technical solutions, the outer wall of the second structural member is provided with a sealing groove, and the sealing groove is used for accommodating a sealing ring.
In some preferred technical solutions, the number of the sealing grooves is multiple, and the multiple sealing grooves are arranged at intervals along the length direction of the second structural member.
In some preferred technical solutions, the first connecting member transversely penetrates through the second structural member, and the first connecting member does not penetrate through the first structural member.
In some preferred technical schemes, a plurality of rubber discs with upward openings are arranged on the outer wall of the rubber plug body.
In some preferred embodiments, the bottom end of the second structural member has an outer diameter smaller than an outer diameter of the top end of the second structural member.
The invention has the beneficial effects that:
according to the precision control pressure well cementation lower rubber plug, the traditional film type well cementation lower rubber plug is changed into a shear pin type well cementation lower rubber plug, various adverse factors existing in rubber vulcanization are eliminated, the shear pressure of the first connecting piece can be accurately controlled, the first connecting piece cannot be cut in advance in the process of moving the replacement slurry downwards, the rubber plug is communicated with the upper portion and the lower portion to generate slurry mixing, and the well cementation quality is affected; the pressure can not be suddenly increased after the pressure falls to the collision ring, so that safety risk is not brought to well cementation construction operation.
After the rubber plug is located on the bumping ring, the first connecting piece is cut off, the first structural member falls on the supporting part of the third structural member, the supporting part is provided with a circulating hole, and the circulation is continued to replace slurry, so that the well cementation construction operation is completed.
The precisely controlled pressure well cementing lower rubber plug can completely replace the traditional film well cementing lower rubber plug, and has accurate pressure control and good field use effect.
Drawings
Other features, objects and advantages of the present application will become more apparent upon reading of the following detailed description of non-limiting embodiments thereof, made with reference to the accompanying drawings in which:
FIG. 1 is a schematic view of the overall structure of a precision control pressure well cementing lower rubber plug according to one embodiment of the present invention;
FIG. 2 is a schematic structural view of a second structural member according to an embodiment of the present invention;
list of reference numerals:
1-a first structural member; 2-a second structural member; 3-sealing ring; 4-sealing ring; 5-a third structural member; 6-a support; 7-integral rubber plate; 8-circulation holes; 9-a support; 10-a fabrication hole; 11-a seal ring groove; 12-shear pin screw hole.
Detailed Description
In order to make the embodiments, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it is apparent that the described embodiments are some, but not all embodiments of the present invention. It should be understood by those skilled in the art that these embodiments are only for explaining the technical principle of the present invention, and are not intended to limit the scope of the present invention.
The invention relates to a precise control pressure well cementation lower rubber plug which comprises a first structural member, a second structural member and a third structural member, wherein the second structural member and the third structural member are sequentially sleeved outside the first structural member; the third structural member and the second structural member are both tubular structures, and the first structural member is a columnar structure;
the first structural member and the second structural member are connected through a first connecting piece, the second structural member is fixed to the top of the third structural member, the length of the first structural member is far smaller than that of the third structural member, a supporting part is arranged at the bottom of an inner cavity of the third structural member, the cross section of the supporting part is larger than that of the second structural member, and the vertical distance between the top surface of the supporting body and the bottom surface of the second structural member is larger than that of the first structural member;
when the first connecting piece is under the action of shearing force, the first structural member falls to the supporting part, a plurality of through holes are vertically arranged on the supporting part and are uniformly distributed along the outer edge of the first structural member, and the distance from the axis of the through holes to the axis of the third structural member is greater than the distance from the outer edge of the first structural member to the axis of the third structural member.
In order to more clearly explain the precision control pressure well cementing rubber plug of the invention, a preferred embodiment of the invention is described in detail below with reference to the attached drawings.
As a preferred embodiment of the invention, the fine control pressure well cementation lower rubber plug of the invention is shown in figure 1, and comprises a first structural member 1, a second structural member 2 and a third structural member which are sequentially sleeved outside the first structural member 1, wherein the first structural member 1, the second structural member 2 and the third structural member are coaxially arranged; the third structural member and the second structural member 2 are both tubular structures, and the first structural member 1 is a columnar structure; the first structural member 1 and the second structural member 2 are connected through a first connecting piece 5, the second structural member 2 is fixed at the top of a third structural member, the length of the first structural member 1 is far smaller than that of the third structural member, a supporting part 9 is arranged at the bottom of an inner cavity of the third structural member, the radial section of the supporting part 9 is larger than that of the second structural member 2, and the vertical distance between the top surface of the supporting body 6 and the bottom surface of the second structural member 2 is larger than that of the first structural member 1; in some preferred embodiments of the present application, the first structural member 1 is a core plug, the second structural member 2 is a shear pin seat, and the first connecting member 5 is a shear pin, and specifically, the core plug and the shear pin seat are connected by the shear pin. Referring to fig. 2, the first connecting member 5 transversely penetrates the second structural member 2, and the first connecting member 5 does not penetrate the first structural member 1. Through the material, thickness, intensity and the dangerous section etc. that change first connecting piece 5, the homoenergetic sets for the shearing force that can change first connecting piece 5, can realize the accurate control of well cementation lower plug pressure.
Further, when the first connecting piece 5 is subjected to a shearing force, the first connecting piece 5 is sheared, the first structural member 1 falls to the supporting portion 9, the supporting portion 9 is vertically provided with a plurality of through holes, the through holes are circulation holes 8, the circulation holes 8 are uniformly distributed along the outer edge of the first structural member 1, and the distance from the axis of the circulation holes 8 to the axis of the third structural member is greater than the distance from the outer edge of the first structural member 1 to the axis of the third structural member. The arrangement enables the first structural member 1 not to block the circulation hole 8 after falling onto the support part 9, so that the fluid can circulate and complete the well cementation operation.
Specifically, the third structural member includes a support body 6 and a rubber plug body 7 sleeved outside the support body 6, wherein the outer wall of the rubber plug body is provided with a plurality of rubber discs with upward openings.
The supporting body 6 and the end face of the rubber plug body 7 close to each other are respectively provided with a first assembling portion and a second assembling portion, and when the supporting body 6 is sleeved with the rubber plug body 7, the first assembling portion is matched with the second assembling portion. The first assembling portions are evenly arranged along the length direction of the supporting body 6, and the second assembling portions are evenly arranged along the length direction of the rubber plug body 7. Specifically, the rubber plug body 7 and the supporting body 6 are integrally vulcanized together, and 4-5 grooves are processed on the side face of the supporting body 6, so that the integral rubber plug body 7 is vulcanized more firmly, and the pressure-bearing capacity is further enhanced.
In other preferred embodiments, the second structural member 2 is connected with the third structural member by screw threads. The outer diameter of the bottom end of the second structural member 2 is smaller than the outer diameter of the top end of the second structural member 2. The outer wall of the second structural member 2 is provided with a seal ring groove 11, and the seal ring groove 11 is used for accommodating the seal ring 3. Furthermore, the number of the gasket grooves 11 is plural, and the plural gasket grooves 11 are provided at intervals along the length direction of the second structural member 2. As shown in the figures, the number of the sealing ring grooves of the second structural member 2 is two, and the sealing rings in the two sealing ring grooves are respectively a sealing ring 3 and a sealing ring 4. Specifically, the lower section of the side surface of the second structural member 2 is provided with an external thread, the upper section is provided with a sealing groove, the second structural member 2 is screwed into the female thread on the inner side surface of the support body 6, and the gap between the second structural member and the support body is sealed by a sealing ring 3 in the sealing groove; the second structural member 2 is connected to the first structural member 1 by a first connecting member 5, and a gap between the second structural member 2 and the first structural member 1 is sealed by a seal ring 4.
The application method of the rubber plug under the fine control pressure well cementation is explained as follows:
the method comprises the steps of firstly loading a well cementation lower rubber plug into a casing cement head, starting cementing construction operation after mud is circulated, releasing the well cementation lower rubber plug from the casing cement head, then injecting well cementation cement slurry, releasing a well cementation upper rubber plug immediately after the cement slurry is injected, continuously injecting drilling mud on the well cementation upper rubber plug, and along with the continuous injection of the drilling mud, the well cementation lower rubber plug is located on a collision pressing ring at the lower part of a casing.
After the rubber plug of the invention is located on the bumping ring, when the pressure in the pipe column rises to the set pressure value of the first connecting piece 5, the first connecting piece 5 is cut off, the first structural member 1 falls on the supporting part 9, the circulation holes 8 are drilled around and in the middle of the supporting part 9, the first structural member 1 can not completely block the circulation holes 8, thus the well cementation cement slurry passes through the rubber plug of the well cementation under the accurate control pressure and returns to the annular space outside the well wall and the sleeve, the rubber plug of the well cementation is located on the rubber plug of the well cementation under the accurate control pressure along with the continuous injection of the well cementation slurry, which is called bumping, and the well cementation construction operation is finished. At the moment, the circulation channel is blocked, and the well cementation cement slurry is completely replaced into the annular space between the casing and the well wall.
In the technical solution in the embodiment of the present application, at least the following technical effects and advantages are provided:
according to the precision control pressure well cementation lower rubber plug, the traditional film type well cementation lower rubber plug is designed to be changed into a shear pin type well cementation lower rubber plug, various adverse factors existing in rubber vulcanization are eliminated, the shear pressure of the first connecting piece can be accurately controlled, the first connecting piece cannot be cut off in advance in slurry replacement downward movement, the rubber plug is communicated up and down to generate mixing paddles, and the well cementation quality is affected; the pressure can not be suddenly increased after the pressure falls to the collision ring, so that safety risk is not brought to well cementation construction operation.
After the rubber plug is located on the bumping ring, the first connecting piece is cut off, the first structural member falls on the supporting part of the third structural member, the supporting part is provided with a circulating hole, and the circulation is continued to replace slurry, so that the well cementation construction operation is completed.
The precisely controlled pressure well cementing lower rubber plug can completely replace the traditional film well cementing lower rubber plug, and has accurate pressure control and good field use effect.
It should be noted that in the description of the present invention, the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicating the directions or positional relationships are based on the directions or positional relationships shown in the drawings, which are only for convenience of description, and do not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
Furthermore, it should be noted that, in the description of the present invention, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
The terms "comprises," "comprising," or any other similar term are intended to cover a non-exclusive inclusion, such that a process, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, article, or apparatus.
So far, the technical solutions of the present invention have been described in connection with the preferred embodiments shown in the drawings, but it is easily understood by those skilled in the art that the scope of the present invention is obviously not limited to these specific embodiments. Equivalent changes or substitutions of related technical features can be made by those skilled in the art without departing from the principle of the invention, and the technical scheme after the changes or substitutions can be within the protection scope of the invention.
Claims (10)
1. The fine control pressure well cementation lower rubber plug is characterized by comprising a first structural member, a second structural member and a third structural member, wherein the second structural member and the third structural member are sleeved outside the first structural member in sequence; the third structural member and the second structural member are both tubular structures, and the first structural member is a columnar structure;
the first structural member is connected with the second structural member through a first connecting piece, the second structural member is fixed at the top of the third structural member, the length of the first structural member is far smaller than that of the third structural member, a supporting part is arranged at the bottom of an inner cavity of the third structural member, the radial section of the supporting part is larger than that of the second structural member, and the vertical distance between the top surface of the supporting body and the bottom surface of the second structural member is larger than that of the first structural member;
when the first connecting piece is under the action of shearing force, the first structural member falls to the supporting part, a plurality of through holes are vertically arranged on the supporting part and are uniformly distributed along the outer edge of the first structural member, and the distance from the axis of the through holes to the axis of the third structural member is greater than the distance from the outer edge of the first structural member to the axis of the third structural member.
2. The rubber plug for precision control pressure well cementation according to claim 1, wherein the third binding member comprises a support body and a rubber plug body sleeved outside the support body, the end surfaces of the support body and the rubber plug body close to each other are respectively provided with a first assembling portion and a second assembling portion, and when the rubber plug body is sleeved outside the support body, the first assembling portion and the second assembling portion are matched.
3. The fine control pressure well cementation lower rubber plug according to claim 2, wherein the first assembling portions are uniformly arranged along the length direction of the support body, and the second assembling portions are uniformly arranged along the length direction of the rubber plug body.
4. The fine control pressure well cementing plug according to claim 1, wherein the support body and the plug body are vulcanized together.
5. The fine control pressure well cementation plug as claimed in claim 1, wherein the second structural member is connected with the third structural member by screw thread.
6. The fine control pressure well cementation lower rubber plug according to claim 1, wherein a sealing groove is formed in the outer wall of the second structural member and used for accommodating a sealing ring.
7. The fine control pressure well cementation lower rubber plug according to claim 6, wherein the sealing grooves are multiple, and the sealing grooves are arranged at intervals along the length direction of the second structural member.
8. The fine control pressure cementing plug according to claim 1, wherein the first connector extends transversely through the second structure and the first connector does not extend through the first structure.
9. The fine control pressure well cementation lower rubber plug as claimed in claim 2, wherein the outer wall of the rubber plug body is provided with a plurality of rubber discs with upward openings.
10. The fine control pressure cementing plug according to claim 1, wherein the bottom end of the second structural member has an outer diameter smaller than the top end of the second structural member.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110981968.7A CN115726727A (en) | 2021-08-25 | 2021-08-25 | Precision control pressure well cementing lower rubber plug |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110981968.7A CN115726727A (en) | 2021-08-25 | 2021-08-25 | Precision control pressure well cementing lower rubber plug |
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| Publication Number | Publication Date |
|---|---|
| CN115726727A true CN115726727A (en) | 2023-03-03 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110981968.7A Pending CN115726727A (en) | 2021-08-25 | 2021-08-25 | Precision control pressure well cementing lower rubber plug |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2670591Y (en) * | 2003-12-31 | 2005-01-12 | 中国石化集团胜利石油管理局渤海钻井总公司固井公司 | Pin fixed cementing front separate plug |
| CN204571921U (en) * | 2015-04-09 | 2015-08-19 | 中国石油集团西部钻探工程有限公司 | Anti-sticking plug is used in well cementation |
| CN207093029U (en) * | 2017-08-21 | 2018-03-13 | 中国石油集团渤海钻探工程有限公司 | A kind of well cementing impact pressure early warning mechanism |
| CN108361001A (en) * | 2018-01-10 | 2018-08-03 | 河南中源化学股份有限公司 | A kind of deep trona drilling well exploitation cementing stage technique |
| US20190017348A1 (en) * | 2017-07-14 | 2019-01-17 | Conocophillips Company | Delayed fin deployment wiper plug |
-
2021
- 2021-08-25 CN CN202110981968.7A patent/CN115726727A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2670591Y (en) * | 2003-12-31 | 2005-01-12 | 中国石化集团胜利石油管理局渤海钻井总公司固井公司 | Pin fixed cementing front separate plug |
| CN204571921U (en) * | 2015-04-09 | 2015-08-19 | 中国石油集团西部钻探工程有限公司 | Anti-sticking plug is used in well cementation |
| US20190017348A1 (en) * | 2017-07-14 | 2019-01-17 | Conocophillips Company | Delayed fin deployment wiper plug |
| CN207093029U (en) * | 2017-08-21 | 2018-03-13 | 中国石油集团渤海钻探工程有限公司 | A kind of well cementing impact pressure early warning mechanism |
| CN108361001A (en) * | 2018-01-10 | 2018-08-03 | 河南中源化学股份有限公司 | A kind of deep trona drilling well exploitation cementing stage technique |
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