CN201794527U - Casing float collar - Google Patents
Casing float collar Download PDFInfo
- Publication number
- CN201794527U CN201794527U CN2010202840379U CN201020284037U CN201794527U CN 201794527 U CN201794527 U CN 201794527U CN 2010202840379 U CN2010202840379 U CN 2010202840379U CN 201020284037 U CN201020284037 U CN 201020284037U CN 201794527 U CN201794527 U CN 201794527U
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- casing
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- ring
- box cupling
- tubular body
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Abstract
The utility model discloses a casing float collar. The casing float collar comprises a tubular body, a blind plate and a check ring, wherein the two ends of the tubular body are respectively provided with a first connecting end and a second connecting end; the inner wall of the tubular body is provided with an annular step and an annular groove; the check ring is arranged in the annular groove; the blind plate is arranged between the annular step and the check ring; and the blind plate is a brittle plate which can be broken into small particles when subjected to hydraulic impact of 15 to 35MPa. The casing float collar ensures that the well cementing process is easy and reliable to operate, greatly reduces the operation time and operation cost of the well cementing process, and has high economic benefit.
Description
Technical field
The utility model relates to the technical field of tools of well cementing operation, specifically a kind of casing floating box cupling of the usefulness of cementing the well.
Background technology
At present, at extended reach well, in the well cementation process of particularly long horizontal segment well, sleeve pipe in the casing job can paste the borehole wall to slide forward after entering horizontal segment always, along with the increase of casing length, action of gravity make sleeve pipe to be lowered to frictional resistance very big, very serious to casing wear, because sleeve pipe is not placed in the middle in well, had a strong impact on the cementing quality of horizontal segment, follow-up operation and production work have been brought a lot of inconvenience.
The casing floating technology is to utilize floating coupling to set up the casing section that does not contain drilling fluid or contain low density liquid in the sleeve pipe of horizontal segment, thereby makes the sleeve pipe of this section produce buoyancy upwards in completion fluid, reduces the frictional resistance that is lowered to of sleeve pipe, and sleeve pipe is lowered to smoothly.
The patent No. is that the Chinese utility model patent of ZL200820124103.9 discloses a kind of casing floating box cupling, that can realize sleeve pipe floatingly is lowered to operation, but if carry out well cementing operation, then need to be lowered to drilling tool floating coupling internal part brill is removed, increased activity duration and operating cost.
The patent No. is that the Chinese utility model patent of ZL02210159.4 also discloses a kind of casing floating box cupling, can realize that also casing floating is lowered to process, after tubing string is lowered to and puts in place, suppress earlier, the floating coupling internal part is suppressed logical, remaining all component can with the well cementation the bruising plug move down into the block ring place, can bore once more at sleeve bottom and remove, but this instrument can not be installed in the sleeve pipe tubing string too much, can't realize that the bruising plug replaces the process of a plurality of floating coupling inner components.
The patent No. is that the Chinese utility model patent of ZL200720169771.9 discloses a kind of blind plate of exempting to bore, by the processing that interior panelling is slotted, weaken the intensity in centre, make floating coupling when being subjected to hydraulic coupling and breaking, fracture pressure everywhere is identical.Back or a global shape but blind plate breaks just can be impacted by hydraulic coupling and hold a fluid passage, and the residual parts of meeting in the sleeve pipe when well cementation, influence passing through of plug rubber, influence well cementing operation.
Prior art all needs to be lowered to once more drilling tool and bores except that contents in the multistage floating cementing technology of sleeve pipe, has increased a large amount of activity durations and operating cost.
The utility model content
In order to solve the above-mentioned problems in the prior art, the utility model provides a kind of casing floating box cupling, the sleeve pipe that can better solve extended reach well or long horizontal segment well is lowered to and the well cementation problem, and bore to remove under the situation of contents and finish follow-up well cementing operation not needing to be lowered to drilling tool, thereby reduce activity duration and operating cost.
In order to solve the problems of the technologies described above, the utility model has adopted following technical scheme:
The casing floating box cupling comprises a tubular body, also comprises blind plate and back-up ring, wherein,
The two ends of described tubular body form first link and second link respectively, and the inwall of described tubular body forms a ring-shaped step and an annular groove;
Described back-up ring is located in the annular groove;
Described blind plate is located between ring-shaped step and the back-up ring, and described blind plate is to be subjected to the fluid power of 15～35MPa to impact the fragility plate that promptly is broken into tiny particle.
The internal diameter of the external diameter of described first link and second link is suitable.
Described first link has external screw thread, and described second link has internal thread.
Described fragility plate is the vitreous ceramic plate.
Compared with prior art, the beneficial effects of the utility model are: the blind plate of casing floating box cupling of the present utility model can be broken into tiny particle after bearing certain pressure, can flow out the inside pipe casing space in company with mud or completion fluid, can residual any parts in sleeve pipe, do not need to be lowered to once more drilling tool and bore and remove, can directly utilize the float shoe of sleeve bottom to carry out well cementing operation.Make the process operation letter, reliable of well cementation, greatly reduce the activity duration and the operating cost of well cementation, have very high economic benefit.
Description of drawings
Fig. 1 partly cuts open figure for the structure of casing floating box cupling of the present utility model;
Fig. 2 partly cuts open figure for the principle of casing floating box cupling of the present utility model in well cementing operation.
The specific embodiment
Below in conjunction with the drawings and specific embodiments the utility model is described in further detail, but not as to qualification of the present utility model.
The casing floating box cupling, comprise a tubular body 1, back-up ring 2 and blind plate 3, the two ends of described tubular body form first link 5 and second link 4 respectively, the inwall of described tubular body 1 forms a ring-shaped step and an annular groove, back-up ring 2 is located in the annular groove, and blind plate 3 is located between this ring-shaped step and the back-up ring 2, and back-up ring 2 and ring-shaped step are spacing with blind plate 3, blind plate 3 is with the tubular body sealing, and blind plate 3 impacts the fragility plate that promptly is broken into tiny particle for the fluid power that is subjected to 15～35MPa.The body of casing floating box cupling of the present utility model adopts integral structure, does not adopt multistage ways of connecting in the prior art, and overall structure is more firm.And blind plate adopts fragile material, after having certain impact, be broken into tiny particle, can flow out the inside pipe casing space in company with mud or completion fluid, can residual any parts in sleeve pipe, not needing to be lowered to once more drilling tool in well cementing operation bores and removes, save operation, reduced operation easier.
As one of present embodiment preferred, the internal diameter of the external diameter of described first link and second link is suitable, described first link has external screw thread, described second link has internal thread.The two ends of casing floating box cupling of the present utility model can be suitable, and this kind box cupling can be that two box cuplings connect when in use, also can be that box cupling is connected with sleeve pipe.
Preferred as another of present embodiment, described fragility plate is the vitreous ceramic plate.Actual conditions according to well cementation; those skilled in the art can select suitable vitreous ceramic to make back-up ring 3; make back-up ring 3 under required pressure impacts, be broken into tiny particle,, and then finish the enforcement of well cementing operation so that flow out sleeve pipe with companion mud or completion fluid.Certainly, the fragility plate of casing floating box cupling of the present utility model also can adopt other fragile material, as long as can be broken into tiny particle under certain fluid power impacts.
As shown in Figure 2, connect with sleeve pipe 7 between two casing floating box cuplings 6, constitute an airtight space.In confined space, be not in the milk, in tubing string, will form " air bag " that is full of air 8.When whole tubing string is in completion fluid, should " air bag " will produce buoyancy upwards.According to the buoyancy size that the Force Calculation needs of tubing string produce, determine the size of floating " air bag " and what, and riding position, thereby reduce the frictional force of tubing string and soffit, sleeve pipe is lowered to smoothly puts in place.
For advantage of the present utility model is further understood, below the method for using casing floating box cupling of the present utility model to cement the well is described.
Cementing method comprises the steps:
A. calculate sleeve pipe stressed in being lowered to process according to casing programme, determine the installation site of casing floating box cupling and quantity is installed;
B. the result who determines according to step a casing floating box cupling splicing sleeve pours into mud in not needing floating casing section;
C. the sleeve pipe that connects is lowered to put in place after, suppress with pump truck, get through each casing floating box cupling successively;
D. the completion fluid that circulates, the cement injection well cementation;
E. throw plug, replace cement paste, bruising, construction operation finishes;
Described casing floating box cupling is above-mentioned any casing floating box cupling.
As can be seen, use casing floating box cupling of the present utility model that the well cementing operation time is shortened, cost reduces, and has saved the operation of removing the casing coupling contents, has reduced operation easier, and well cementing operation can be finished continuously.
Above embodiment is an exemplary embodiment of the present utility model only, is not used in restriction the utility model, and protection domain of the present utility model is defined by the claims.Those skilled in the art can make various modifications or be equal to replacement the utility model in essence of the present utility model and protection domain, this modification or be equal to replacement and also should be considered as dropping in the protection domain of the present utility model.
Claims (4)
1. the casing floating box cupling comprises a tubular body, it is characterized in that, also comprises blind plate and back-up ring, wherein,
The two ends of described tubular body form first link and second link respectively, and the inwall of described tubular body forms a ring-shaped step and an annular groove;
Described back-up ring is located in the annular groove;
Described blind plate is located between ring-shaped step and the back-up ring, and described blind plate is to be subjected to the fluid power of 15～35MPa to impact the fragility plate that promptly is broken into tiny particle.
2. casing floating box cupling according to claim 1 is characterized in that, the internal diameter of the external diameter of described first link and second link is suitable.
3. casing floating box cupling according to claim 1 is characterized in that, described first link has external screw thread, and described second link has internal thread.
4. casing floating box cupling according to claim 1 is characterized in that, described fragility plate is the vitreous ceramic plate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010202840379U CN201794527U (en) | 2010-08-06 | 2010-08-06 | Casing float collar |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010202840379U CN201794527U (en) | 2010-08-06 | 2010-08-06 | Casing float collar |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201794527U true CN201794527U (en) | 2011-04-13 |
Family
ID=43849442
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010202840379U Expired - Lifetime CN201794527U (en) | 2010-08-06 | 2010-08-06 | Casing float collar |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201794527U (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102373888A (en) * | 2010-08-06 | 2012-03-14 | 安东石油技术（集团）有限公司 | Sleeve floating coupling and well cementing method |
| CN102943648A (en) * | 2012-10-10 | 2013-02-27 | 中国石油集团长城钻探工程有限公司 | Floating tool applied to screen pipe well completion |
| CN105442834A (en) * | 2016-01-08 | 2016-03-30 | 平煤神马建工集团有限公司 | Combined connecting pipe and connecting method thereof |
| CN107165587A (en) * | 2017-06-19 | 2017-09-15 | 中国石油集团川庆钻探工程有限公司长庆固井公司 | A kind of floating coupling device and sleeve pipe pay-off method |
| CN112412342A (en) * | 2020-12-15 | 2021-02-26 | 中国石油天然气集团有限公司 | Breakable blind plate type floating coupling device, using method and preparation method of blind plate |
-
2010
- 2010-08-06 CN CN2010202840379U patent/CN201794527U/en not_active Expired - Lifetime
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102373888A (en) * | 2010-08-06 | 2012-03-14 | 安东石油技术（集团）有限公司 | Sleeve floating coupling and well cementing method |
| CN102943648A (en) * | 2012-10-10 | 2013-02-27 | 中国石油集团长城钻探工程有限公司 | Floating tool applied to screen pipe well completion |
| CN105442834A (en) * | 2016-01-08 | 2016-03-30 | 平煤神马建工集团有限公司 | Combined connecting pipe and connecting method thereof |
| CN107165587A (en) * | 2017-06-19 | 2017-09-15 | 中国石油集团川庆钻探工程有限公司长庆固井公司 | A kind of floating coupling device and sleeve pipe pay-off method |
| CN107165587B (en) * | 2017-06-19 | 2023-11-03 | 中国石油集团川庆钻探工程有限公司长庆固井公司 | Floating coupling device and casing running method |
| CN112412342A (en) * | 2020-12-15 | 2021-02-26 | 中国石油天然气集团有限公司 | Breakable blind plate type floating coupling device, using method and preparation method of blind plate |
| CN112412342B (en) * | 2020-12-15 | 2023-03-07 | 中国石油天然气集团有限公司 | Breakable blind plate type floating coupling device, using method and preparation method of blind plate |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20110413 |
|
| CX01 | Expiry of patent term |