CN108086941B - Selective well cementing device - Google Patents
Selective well cementing device Download PDFInfo
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- CN108086941B CN108086941B CN201711279468.9A CN201711279468A CN108086941B CN 108086941 B CN108086941 B CN 108086941B CN 201711279468 A CN201711279468 A CN 201711279468A CN 108086941 B CN108086941 B CN 108086941B
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- Prior art keywords
- ball seat
- pipe body
- ball
- selective
- hole
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Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/13—Methods or devices for cementing, for plugging holes, crevices, or the like
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B34/00—Valve arrangements for boreholes or wells
- E21B34/06—Valve arrangements for boreholes or wells in wells
- E21B34/08—Valve arrangements for boreholes or wells in wells responsive to flow or pressure of the fluid obtained
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B2200/00—Special features related to earth drilling for obtaining oil, gas or water
- E21B2200/04—Ball valves
Abstract
The invention relates to a selective cementing device. This selectivity well cementation device includes the body, is equipped with first ball seat second ball seat along the axial interval of body in the body, and selectivity well cementation device is still including the spring that is used for supporting the second ball seat, first ball seat and body fixed connection, and the axial displacement of body can be followed to the second ball seat, still is equipped with the circulation hole on the body, and the second ball seat has the closed position of closing the circulation hole and moves in order to open the position of opening of circulation hole to the bottom at the in-process that removes, the body still is equipped with between the position of opening of first ball seat and second ball seat and pressurizes the hole, and the body is equipped with the packer in the outside of pressurizing the hole. When cement is filled, the second ball seat moves towards the bottom of the well cementation device under the pressure of the cement, the circulation hole is opened, and the cement enters between the sleeve and the well wall through the circulation hole, so that the cement can be selectively filled into the annular space on the upper portion of the packer, the well cementation operation of the annular space above the packer is realized, and the cement plug is prevented from appearing on the lower portion of the packer.
Description
Technical Field
The invention relates to a selective cementing device.
Background
The well cementing operation is a construction operation of lowering a casing into a well and injecting cement into an annular space between the well hole and the casing, is an important operation in a drilling process, and mainly aims at protecting and supporting the casing in an oil-gas well and sealing oil, gas, water and other strata. The selective cementing operation is the selective cementing operation when cement is selectively injected into a certain section of annular space between the casing and the well bore, the selective cementing operation can ensure that the optimal communication condition is kept between an oil-gas layer and the well bore, and simultaneously, the sand production of the oil layer is controlled, and the collapse of the well wall is prevented.
The utility model discloses a chinese utility model patent that the bulletin number is CN205858270U, the bulletin date is 2017.01.04 discloses a selectivity well cementation device, and this selectivity well cementation device includes sleeve pipe inner tube and sleeve pipe outer tube, and the upper end of sleeve pipe inner tube, sleeve pipe outer tube is equipped with isolator and last blast valve, and isolator and lower blast valve under the lower extreme of sleeve pipe inner tube, sleeve pipe outer tube is equipped with, has the passageway of blast valve and lower blast valve on the intercommunication between sleeve pipe inner tube and the sleeve pipe outer tube.
The selective well cementation device adopts a double-layer sleeve structure, and cement for well cementation can bypass a production zone through a channel between two layers of sleeves, so that the purpose of selective well cementation for well cementation above and below the production zone is realized. However, in the process of well cementation, the part below the packer can form a cement plug at the lower part of the casing due to the gravity displacement effect of cement, which affects the subsequent production operation, the channel gap between the double-layer casing is small, the pressure is large when the cement is injected, the pressure is easy to build up during the well cementation operation, and the stratum can be pressed and leaked in serious cases.
Disclosure of Invention
The invention aims to provide a selective well cementing device to solve the problem that a cement plug is formed below a casing pipe by the selective well cementing device in the prior art.
In order to solve the technical problems, the technical scheme of the selective well cementation device is as follows:
scheme 1: the utility model provides a selectivity well cementation device, includes the body, be equipped with two ball seats along the axial interval of body in the body, two ball seats are the first ball seat that is close to the body bottom and the second ball seat that is close to the body top, the second ball seat has the passageway that is used for making the bowling of first ball seat pass through, selectivity well cementation device is still including the spring that is used for supporting the second ball seat, first ball seat and body fixed connection, the axial displacement of body can be followed to the second ball seat, still be equipped with the circulation hole that is used for the filling cement on the body, the second ball seat has the closed position of closing the circulation hole and moves the position of opening in order to open the circulation hole to the bottom at the in-process that removes, the body still is equipped with the tamping hole between the position of opening of first ball seat and second ball seat, the body is equipped with the.
The technical scheme has the beneficial effects that: the first ball seat and the second ball seat are arranged in the pipe body at intervals, the second ball seat is supported through the spring, when cement is filled, the second ball seat moves towards the bottom of the selective well cementation device under the pressure of the cement, the circulation hole is opened, the cement enters the space between the sleeve and the well wall through the circulation hole, and therefore the cement can be filled into the annular space on the upper portion of the packer selectively, well cementation operation of the annular space above the packer is achieved, cement plugs are prevented from appearing on the lower portion of the packer, and the selective well cementation device is simple in structure and good in reliability.
Scheme 2: according to the selective well cementation device in the scheme 1, the outer peripheral surface of the second ball seat is in sliding sealing fit with the inner wall of the pipe body. The outer peripheral surface of the second ball seat can realize the closing and opening of the circulation hole, and the structure is simple.
Scheme 3: according to the selective well cementation device in the scheme 1 or 2, two ends of the spring are respectively assembled on the first ball seat and the second ball seat in a pressing mode. The spring is directly assembled between the first ball seat and the second ball seat in a jacking way, so that the first ball seat is reasonably utilized, and the structure in the pipe body is reduced.
Scheme 4: according to the selective well cementation device in the scheme 1 or 2, a limiting structure for limiting the stroke of the second ball seat is arranged between the first ball seat and the second ball seat of the pipe body. The limiting structure limits the stroke of the second ball seat and avoids damage caused by overlarge compression of the spring.
Scheme 5: according to the selective well cementation device in the scheme 4, the limiting structure is a limiting sleeve which is coaxially arranged with the pipe body. The limiting sleeve is simple in structure and convenient to install.
Scheme 6: according to the selective well cementation device of the scheme 5, one end, close to the first ball seat, of the limiting sleeve is abutted to the first ball seat, and a communicating hole which is used for communicating a pipeline in the pipe body with the pressing hole is further formed in the limiting sleeve. The stop collar butt is on first ball seat, makes first ball seat and stop collar bear the pressure of second ball seat together, has strengthened the bearing capacity of stop collar.
Scheme 7: the selective cementing device according to the scheme 1 or 2, wherein the first ball seat is connected with the pipe body through a pin. The pin is low in cost and simple and reliable in connection.
Scheme 8: according to the selective well cementation device in the scheme 1 or 2, the pipe body is further provided with a lining, and the circulation hole is an inner hole of the lining. The lining can reduce the wearing and tearing of the sand grain in the cement to the body, increases the life of body.
Drawings
FIG. 1 is a schematic structural view of an embodiment 1 of the selective cementing apparatus of the present invention.
The respective symbols in the figure: 1. an internal thread; 2. a pipe body; 3. second pitching; 4. a second ball seat; 5. a circulation hole; 6. a spring; 7. a limiting sleeve; 8. a packer; 9. punching a hole; 10. a first ball seat; 11. first pitching; 12. an external thread; 13. a pin; 14. a bushing.
Detailed Description
Embodiment 1 of the selective cementing apparatus of the present invention as shown in fig. 1, the selective cementing apparatus comprises a pipe body 2, the top of the pipe body 2 is provided with an internal thread 1, the bottom is provided with an external thread 12, the internal thread 1 and the external thread 12 are respectively identical to the internal thread and the external thread of the casing pipe so as to be connected with the casing pipe.
The pipe body 2 is provided with two ball seats at an interval in an axial direction thereof, the two ball seats being a first ball seat 10 near a bottom of the pipe body 2 and a second ball seat 4 near a top of the pipe body, the second ball seat 4 having a passage for passing a first shot 11 of the first ball seat 10. The selective cementing apparatus further comprises a spring 6 for supporting the second ball seat 4, in this embodiment the spring 6 is press-fitted between the first ball seat 10 and the second ball seat 4. The first ball seat 10 is fixedly connected with the pipe body 2 through a pin 13, the second ball seat 4 can move along the axial direction of the pipe body 2, and in other embodiments, the first ball seat 10 and the pipe body 2 can be connected through a rivet or a welding connection. The pipe body 2 is further provided with bushings 14, inner holes of the bushings 14 are circulation holes 5 for filling cement, in this embodiment, four bushings 14 are uniformly distributed along the circumferential direction of the pipe body 2, in other embodiments, the bushings 14 may be omitted, and the radial through holes on the pipe body 2 are circulation holes. The second ball seat 4 has a closing position for closing the circulation hole 5 and an opening position for opening the circulation hole 5 by moving to the bottom in the moving process, the outer peripheral surface of the second ball seat 4 is in sliding sealing fit with the inner wall of the pipe body 2, and the second ball seat 4 realizes the opening and closing of the circulation hole 5 by means of the outer peripheral surface thereof. The body 2 still is equipped with between the position of opening of first ball seat 10 and second ball seat 4 and beats the hole 9, beats the outside in hole and is equipped with packer 8, in this embodiment, beats the hole 9 and has four along the circumference evenly distributed of body 2.
A limiting structure for limiting the stroke of the second ball seat 4 is further arranged between the first ball seat 10 and the second ball seat 4 in the tube body 2, in this embodiment, the limiting structure is a limiting sleeve 7 coaxially arranged with the tube body 2, one end of the limiting sleeve 7 close to the first ball seat 10 abuts against the first ball seat 10, so that the first ball seat 10 and the limiting sleeve 7 can bear the pressure of the second ball seat 4 together, and the pressure bearing capacity of the limiting sleeve 7 is enhanced; the limiting sleeve 7 is also provided with a communicating hole for communicating the pipeline in the pipe body 2 with the pressurizing hole 9, in other embodiments, a limiting structure can be omitted, and the stroke of the second ball seat 4 is controlled by controlling the pressure of filling cement.
When the selective well cementation device is used, a pipe body 2 is connected in series on a sleeve through an internal thread 1 and an external thread 12, a short section serving as the sleeve is lowered to a set position along with the sleeve, a first pitching ball 11 is thrown into the sleeve, the first pitching ball 11 falls on a first ball seat 10 and cuts off an annular space between the sleeve and a well wall, an operator presses the sleeve from the ground, a packer 8 is sealed through a pressing hole 9 by pressure, so that the annular space between the sleeve and the well wall is closed, a second pitching ball 3 is continuously thrown into the sleeve, the second pitching ball 3 falls on a second ball seat 4, cement is injected into the sleeve, the second ball seat 4 moves downwards under the pressure of the cement against the pressure of a spring 6, so that a circulation hole 5 is opened, the cement enters the annular space between the sleeve and the well wall at the upper part of the packer 8 through the circulation hole 5, and the annular space at the upper part of the packer 8 is selectively subjected to well cementation, after the pressure of the second ball seat 4 is released, the second ball seat 4 rebounds under the action of the pressure of the spring 6, so that the circulation hole 5 is closed, cement is prevented from flowing back into the casing, and after the cement is solidified, the second pitching ball 3, the second ball seat 4, the first pitching ball 11 and the first ball seat 10 are ground through a grinding shoe, so that subsequent well completion operation can be carried out.
Example 2 of the selective cementing apparatus of the present invention differs from example 1 in that: in embodiment 1, one end butt of stop collar is on first ball seat, and in this embodiment, the stop collar also can set up between first ball seat and second ball seat, fixes on the body through structure such as pin or rivet.
Example 3 of the selective cementing apparatus of the present invention differs from example 1 in that: in embodiment 1, the position-limiting structure is a position-limiting sleeve, and in this embodiment, the position-limiting structure may also be an inner ring platform or a stop block disposed on the inner wall of the tube body.
Example 4 of the selective cementing apparatus of the present invention differs from example 1 in that: in embodiment 1, one end of the spring is directly press-fitted to the first ball seat, and in this embodiment, a spring seat may be additionally provided between the first ball seat and the second ball seat, and the spring is press-fitted between the first ball seat and the spring seat.
Example 5 of the selective cementing apparatus of the present invention differs from example 1 in that: in embodiment 1, the outer circumferential surface of the second ball seat is in sliding sealing fit with the inner wall of the pipe body, and the opening and closing of the circulation hole are controlled by the outer circumferential surface of the second ball seat.
Claims (8)
1. A selective cementing apparatus, characterized by: the selective well cementing device comprises a pipe body, wherein two ball seats are arranged in the pipe body at intervals along the axial direction of the pipe body, the two ball seats are a first ball seat close to the bottom of the pipe body and a second ball seat close to the top of the pipe body, the second ball seat is provided with a channel for enabling a pitching ball of the first ball seat to pass through, the selective well cementing device further comprises a spring for supporting the second ball seat, the first ball seat is fixedly connected with the pipe body, the second ball seat can move along the axial direction of the pipe body, a circulating hole for filling cement is further formed in the pipe body, the second ball seat has a closing position for closing the circulating hole and an opening position for moving towards the bottom to open the circulating hole in the moving process, a pressurizing hole is further formed in the pipe body between the opening positions of the first ball seat and the second ball seat, a packer is arranged outside the pressurizing hole, when the selective well cementing device is used, the pipe body is connected in series to, the method comprises the steps of putting a first pitching ball into a casing, dropping the first pitching ball on a first ball seat and cutting off an annular space between the casing and a well wall, pressing the casing from the ground by an operator, setting a packer through a pressing hole under the pressure, sealing the annular space between the casing and the well wall, continuing to put a second pitching ball into the casing, dropping the second pitching ball on a second ball seat, adding cement into the casing, overcoming the pressure of a spring to move downwards by the second ball seat under the pressure of the cement, opening a circulation hole, and enabling the cement to enter the annular space between the casing and the well wall on the upper portion of the packer through the circulation hole, so that well cementation operation is selectively realized on the annular space on the upper portion of the packer.
2. The selective cementing apparatus of claim 1, wherein: the outer peripheral surface of the second ball seat is in sliding sealing fit with the inner wall of the pipe body.
3. The selective cementing apparatus of claim 1 or 2, wherein: and two ends of the spring are respectively propped and assembled on the first ball seat and the second ball seat.
4. The selective cementing apparatus of claim 1 or 2, wherein: the pipe body is provided with a limiting structure for limiting the stroke of the second ball seat between the first ball seat and the second ball seat.
5. The selective cementing apparatus of claim 4, wherein: the limiting structure is a limiting sleeve which is coaxially arranged with the pipe body.
6. The selective cementing apparatus of claim 5, wherein: one end of the limiting sleeve, which is close to the first ball seat, is abutted against the first ball seat, and the limiting sleeve is further provided with a communicating hole which communicates the pipeline in the pipe body and the pressurizing hole.
7. The selective cementing apparatus of claim 1 or 2, wherein: the first ball seat is connected with the pipe body through a pin.
8. The selective cementing apparatus of claim 1 or 2, wherein: the pipe body is further provided with a lining, and the circulating hole is an inner hole of the lining.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711279468.9A CN108086941B (en) | 2017-12-06 | 2017-12-06 | Selective well cementing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711279468.9A CN108086941B (en) | 2017-12-06 | 2017-12-06 | Selective well cementing device |
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| Publication Number | Publication Date |
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| CN108086941A CN108086941A (en) | 2018-05-29 |
| CN108086941B true CN108086941B (en) | 2020-03-06 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201711279468.9A Active CN108086941B (en) | 2017-12-06 | 2017-12-06 | Selective well cementing device |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111508318B (en) * | 2020-04-27 | 2021-12-03 | 李建勋 | Counter is got ready to self-defined subregion |
| CN112593894B (en) * | 2020-12-24 | 2022-06-03 | 山西晋城无烟煤矿业集团有限责任公司 | Multi-purpose multi-stage discontinuous well cementation method for preventing pollution of production layer |
| CN113266306B (en) * | 2021-06-25 | 2022-04-29 | 洲际海峡能源科技有限公司 | Automatic opening cement umbrella for well cementation and use method thereof |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4872510A (en) * | 1988-09-30 | 1989-10-10 | Baker Hughes Incorporated | Subterranean well casing float tool |
| CN2620081Y (en) * | 2003-05-21 | 2004-06-09 | 刘爱军 | Side through type automatic slurry-irrigation sleeve float coupling |
| CN2687311Y (en) * | 2004-03-09 | 2005-03-23 | 苗在朝 | Drilling cementation water injection mud non-return valve |
| CN2861469Y (en) * | 2005-12-09 | 2007-01-24 | 天津理工大学 | Packer with expansion guiding ring |
| CN201024977Y (en) * | 2007-05-10 | 2008-02-20 | 辽河石油勘探局 | A multi-function concrete injection well fixing device |
| CN201024982Y (en) * | 2007-04-28 | 2008-02-20 | 中国石油天然气股份有限公司 | A concrete extrusion and injection control tool |
| CN204060620U (en) * | 2014-08-06 | 2014-12-31 | 大庆市永晨石油科技有限公司 | Well cementation pitching sliding sleeve |
-
2017
- 2017-12-06 CN CN201711279468.9A patent/CN108086941B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4872510A (en) * | 1988-09-30 | 1989-10-10 | Baker Hughes Incorporated | Subterranean well casing float tool |
| CN2620081Y (en) * | 2003-05-21 | 2004-06-09 | 刘爱军 | Side through type automatic slurry-irrigation sleeve float coupling |
| CN2687311Y (en) * | 2004-03-09 | 2005-03-23 | 苗在朝 | Drilling cementation water injection mud non-return valve |
| CN2861469Y (en) * | 2005-12-09 | 2007-01-24 | 天津理工大学 | Packer with expansion guiding ring |
| CN201024982Y (en) * | 2007-04-28 | 2008-02-20 | 中国石油天然气股份有限公司 | A concrete extrusion and injection control tool |
| CN201024977Y (en) * | 2007-05-10 | 2008-02-20 | 辽河石油勘探局 | A multi-function concrete injection well fixing device |
| CN204060620U (en) * | 2014-08-06 | 2014-12-31 | 大庆市永晨石油科技有限公司 | Well cementation pitching sliding sleeve |
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| CN108086941A (en) | 2018-05-29 |
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