CN204941366U - Exempt to bore plug well workover small casing tubing string - Google Patents
Exempt to bore plug well workover small casing tubing string Download PDFInfo
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- CN204941366U CN204941366U CN201520391964.3U CN201520391964U CN204941366U CN 204941366 U CN204941366 U CN 204941366U CN 201520391964 U CN201520391964 U CN 201520391964U CN 204941366 U CN204941366 U CN 204941366U
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Abstract
The utility model relates to one and exempts to bore plug well workover small casing tubing string, comprise under enter in former casing and upper end to the tubular column main body of former casing well head, tubular column main body is provided with near the position of lower end in the annular space between former casing and small casing tubing string, inject cement paste or chemical plugging agent and at anti-flushing well time prevent annular space cement paste or the anti-ball-and-seat told of chemical plugging agent.The more piece small casing be serially connected that described tubular column main body comprises the entrance point being connected to ball-and-seat saves small casing with one of the port of export being connected to ball-and-seat.Owing to being provided with ball-and-seat on sleeve pipe tubing string, can not resident water mud in small casing during construction, therefore no longer need to implement to bore the operations such as plug scraping after well cementation time is solidifying, the small casing that solving does not have supporting drilling tool and scraper at present cannot the difficult problem of well workover, simultaneously, ball-and-seat can also avoid cement paste or chemical plugging agent is counter tells, and improves cementing quality.
Description
Technical field
The utility model relates to a kind of well workover small casing tubing string for administering casing damage well.
Background technology
In oilfield exploitation, oil well casing can produce distortion in various degree and damage, and the well of oil well casing deformed damaged is often called as casing damaged well.The restorative procedure that casing damaged well is conventional has multiple, and wherein one adopts lower small casing tubing string to carry out well cementation reparation.Conventional small casing tubing string is primarily of some joint small casings small casing string in series, directly carry out entering under small casing tubing string in former casing full well to projected depth or partly hang when repairing, replace in annular space then between small casing tubing string and former casing into cementing slurry, wait after well cementation solidifying, bore plug, scraping, completion reach reparation object; Repair in cover technique to exist due to this small casing and bore plug and scraping operation, so it can must implement under the prerequisite with the wellbore treatments instrument such as supporting drilling tool and scraper with small casing.
At present, can adopt that above-mentioned what repair cover technique well workover is Ф 127.0mm small casing, as shown in Figure 1, former casing 1 is Ф 177.8mm, small casing 3 is φ 127.0mm, it is as follows that it repaiies cover main process: lower φ 127.0mm sleeve pipe simulative tube simulation drifting, lower Ф 127.0mm small casing tubing string 3 after drifting success, well cementation, Hou Ning, bore plug and obtain cement plug face 4 to design attitude, scraping pit shaft, pressure testing, completion, wherein, well cementation step mainly comprises well-flushing, from small casing 3, just replacing cement paste until annular space neat slurry 2 returns out, close gate, squeeze slurry, squeezing replaces clear water.In this work progress, if simulation drifting is unsuccessful, then need to implement well workover with Ф 114.3mm or Ф 101.6mm small casing, because Ф 114.3mm and Ф 101.6mm small casing do not have supporting drilling tool and scraper at present, so well workover cannot be implemented according to above-mentioned renovation technique when adopting Ф 114.3mm or Ф 101.6mm small casing.
Utility model content
The purpose of this utility model is to provide one and exempts to bore plug well workover small casing tubing string, cannot repair the problem that cover process implementing repairs casing damaged well to solve the small casing not having supporting drilling tool and scraper at present by existing conventional small casing.
For achieving the above object, the utility model adopts following technical scheme: exempt to bore plug well workover small casing tubing string, comprise under enter in former casing and upper end to the tubular column main body of former casing well head, tubular column main body is provided with near the position of lower end in the annular space between former casing and small casing tubing string, inject cement paste or chemical plugging agent and at anti-flushing well time prevent annular space cement paste or the anti-ball-and-seat told of chemical plugging agent.
The more piece small casing be serially connected that described tubular column main body comprises the entrance point being connected to ball-and-seat saves small casing with one of the port of export being connected to ball-and-seat.
Described small casing is without box cupling small casing.
Described small casing is Ф 114.3mm or Ф 101.6mm small casing.
The lower end of described tubular column main body is provided with casing shoe, and this casing shoe is nib shape.
Adopt small casing tubing string of the present utility model well workover, well cementation front lower enter small casing tubing string to well head, the ball-and-seat in tubing string can realize forward well-flushing, squeezing cementing slurry or chemical plugging agent, can stop oppositely counter telling simultaneously.During well cementation, cementing slurry or chemical plugging agent clear water are replaced to design attitude, Hou Ning, visit red dog, pressure testing qualified after, resume production; If it is inaccurate to replace clear water consumption measurement, can following oil pipe to design attitude, by anti-flushing well, wash out pit shaft superfluous water mud or chemical plugging agent, thus obtain desirable position, plug face.In backwash, due to the existence of ball-and-seat, annular space cement paste or chemical plugging agent can not instead be told, and plug face therefore can not be caused too high, also ensured cementing quality simultaneously.In well workover construction, more than the reserved position, plug face of design can not resident water mud or chemical plugging agent in small casing, therefore well cementation wait solidifying after no longer need to implement to bore the operations such as plug, scraping, the small casing that solving does not have supporting drilling tool and scraper cannot the difficult problem of well workover.
Accompanying drawing explanation
Fig. 1 be in background technology Ф 127.0mm small casing tubing string at the structural principle schematic diagram of using state;
Fig. 2 is the structural principle schematic diagram of a kind of embodiment of the utility model in using state.
Detailed description of the invention
Exempting from shown in Fig. 2 bores plug well workover small casing tubing string, it comprises the tubular column main body 13 for entering at present in well workover in former casing, position near lower end in tubular column main body is provided with ball-and-seat 5, in well workover construction, enter in the former casing 1 of Ф 177.8mm under small casing tubing string, tubing string upper end is to former casing well head, lower end is to the repair capsule degree of depth, in the annular space between former casing and small casing tubing string, cementing slurry or chemical plugging agent 2 is injected by ball-and-seat 5, simultaneously, ball-and-seat can also play and prevent annular space cement paste or the anti-effect of telling of chemical plugging agent 2 when anti-flushing well, not only ensure cementing quality, the cement plug face being in ideal position can also be obtained.In Fig. 2,14 is cement plug faces.
Enter under small casing tubing string in process, in order to guide small casing tubular column main body and clear up pit shaft, the lower end of tubular column main body 13 is also provided with casing shoe 6, the shape of this casing shoe is pencil point-shaped.
In the present embodiment, small casing tubular column main body adopts some joint Ф 114.3mm or Ф 101.6mm to form without box cupling small casing, and wherein a joint small casing is connected to the port of export of ball-and-seat, and other more piece small casings are serially connected and are connected to the entrance point of ball-and-seat.In other embodiments, the type of small casing that ball-and-seat import and export end connects, specification and joint number can adopt the physical length often saving small casing to select flexibly according to the actual state of repaiied casing damaged well and institute, as long as ensure that ball-and-seat is on the position of close sleeve body lower end after assembling.
Utilize the work progress of the small casing tubing string of the present embodiment reparation casing damaged well as follows:
1, setting of casing: enter small casing tubing string under in former casing, tubing string down to the repair capsule degree of depth, on to well head;
2, erecting and welding casing head, connecting bypass gate: the sleeve body uplifting window below former casing box cupling between 0.10-0.3m, welding φ 73mm oil connection, connects gate;
3, cement the well: hot water cleans pit shaft, guarantees that pit shaft is without greasy dirt, free from admixture; Ask injectivity index; Just for cement paste in small casing post, until annular space cement paste returns out, close gate, squeeze slurry; Squeezing replaces clear water, replaces cement paste with clear water, if it is inaccurate to replace clear water consumption measurement, cannot obtain reserved position, plug face accurately, can following oil pipe to ball-and-seat top about 10 meters, and anti-flushing well, washes out pit shaft superfluous water mud, trip out whole oil pipe; Closing well is waited solidifying;
4, red dog, pressure testing is visited: after visiting red dog, wellbore pressure test;
5, completion: perforation, lower flow string.
Claims (5)
1. exempt to bore plug well workover small casing tubing string, it is characterized in that: comprise under enter in former casing and upper end to the tubular column main body of former casing well head, tubular column main body is provided with near the position of lower end in the annular space between former casing and small casing tubing string, inject cement paste or chemical plugging agent and at anti-flushing well time prevent annular space cement paste or the anti-ball-and-seat told of chemical plugging agent.
2. according to claim 1 exempting from bores plug well workover small casing tubing string, it is characterized in that: the more piece small casing be serially connected that described tubular column main body comprises the entrance point being connected to ball-and-seat saves small casing with one of the port of export being connected to ball-and-seat.
3. according to claim 2 exempting from bores plug well workover small casing tubing string, it is characterized in that: described small casing is without box cupling small casing.
4. according to claim 3 exempting from bores plug well workover small casing tubing string, it is characterized in that: described small casing is Ф 114.3mm or Ф 101.6mm small casing.
5. bore plug well workover small casing tubing string according to exempting from claim 1-4 described in any one, it is characterized in that: the lower end of described tubular column main body is provided with casing shoe, this casing shoe is nib shape.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520391964.3U CN204941366U (en) | 2015-06-09 | 2015-06-09 | Exempt to bore plug well workover small casing tubing string |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520391964.3U CN204941366U (en) | 2015-06-09 | 2015-06-09 | Exempt to bore plug well workover small casing tubing string |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204941366U true CN204941366U (en) | 2016-01-06 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201520391964.3U Active CN204941366U (en) | 2015-06-09 | 2015-06-09 | Exempt to bore plug well workover small casing tubing string |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110725663A (en) * | 2019-11-06 | 2020-01-24 | 中国石油天然气股份有限公司 | Chemical plugging process for well without damage of fixed pipe column sleeve of bridge plug |
-
2015
- 2015-06-09 CN CN201520391964.3U patent/CN204941366U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110725663A (en) * | 2019-11-06 | 2020-01-24 | 中国石油天然气股份有限公司 | Chemical plugging process for well without damage of fixed pipe column sleeve of bridge plug |
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