CN201705256U - Direct connection type casing string - Google Patents
Direct connection type casing string Download PDFInfo
- Publication number
- CN201705256U CN201705256U CN2009200279279U CN200920027927U CN201705256U CN 201705256 U CN201705256 U CN 201705256U CN 2009200279279 U CN2009200279279 U CN 2009200279279U CN 200920027927 U CN200920027927 U CN 200920027927U CN 201705256 U CN201705256 U CN 201705256U
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- CN
- China
- Prior art keywords
- casing string
- thread
- conical surface
- sleeve
- casing
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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- Earth Drilling (AREA)
- Non-Disconnectible Joints And Screw-Threaded Joints (AREA)
Abstract
The utility model discloses a direct connection type casing string, which comprises a casing A and a casing B, and is characterized in that outer threads of the end portion of the casing A are connected with inner threads of the end portion of the casing B, a connecting position is a congruent diameter structure, a small end of the inner threads of a pipe B is provided with an inner sealing conical surface, a sealing conical surface of the inner threads is provided with an inner anti-torsion table shoulder, an outer sealing conical surface which corresponds to the inner sealing conical surface of the pipe B is arranged in the end portions of the outer threads of the casing A, and the sealing conical surface of the outer threads is provided with an outer anti-torsion table shoulder which corresponds to the inner anti-torsion table shoulder. The direct connection type casing string has the characteristics of excellent sealing effect, strong anti-torsion capacity, full equal diameter, large internal effective menstruation promoting and the like, and is widely applied in overhauling of petroleum exploitation.
Description
One, technical field:
The utility model relates to oil field well inner sleeve post, particularly a kind of direct-connected casing string.
Two, background technology:
At present, the casing string majority of oil field overhaul construction and production usefulness is the serial tubing string of API standard code, this tubing string is that great contribution has been made in oil exploitation, but have following shortcoming and defect simultaneously: 1. the small casing of using at well workover has just had many restrictions, serious as Φ 139.7 casing damage corrosion and damage, after can't doing general sleeve pipe reparation again, adopt when small casing technology is administered down, can only be lowered to Φ 89 oil pipes or process in it and revise Φ 101.6 sleeve pipes of box cupling outside dimension, latus rectum also has only maximum Φ 86mm in the tubing string, just can only descend Φ 60.3 oil pipes when descending flow string again, restrict the production or the injection flow of this oil well greatly; 2. give subsequent job, produce and cause a series of difficulties.
Three, summary of the invention:
The utility model purpose provides a kind of direct-connected casing string, adopts between inclined to one side acme thread casing string the structure of directly connection and sealing cone, torque resistant shoulder, the shortcoming or the deficiency that overcome effectively and avoid existing in the above-mentioned prior art.
Direct-connected casing string described in the utility model comprises sleeve A, sleeve pipe B.The external screw thread of described sleeve A end is connected with the internal thread of sleeve pipe B end, the junction is congruent gauge structure, sleeve pipe B internal thread small end is provided with interior sealing cone, antitorque shoulder in internal thread sealing cone place is provided with, sleeve A external screw thread end be provided with sleeve pipe B in the corresponding external seal conical surface of sealing cone, thread seal conical surface place is provided with and the corresponding outer antitorque shoulder of interior antitorque shoulder outside.
Wherein, described connecting thread profile of tooth is inclined to one side acme thread, tooth depth 1.375-1.575mm.The tapering of described internal thread sealing cone and external screw thread sealing cone is 1: 10.Antitorque shoulder of described internal thread and the antitorque shoulder of external screw thread are 3 ° of conical surfaces.Described sleeve A and sleeve pipe B link together by supporting positive cover C.
The utility model has the following advantages compared with prior art:
1, after body connected, the inside and outside footpath of connection of thread was consistent with body, had increased annular space in the well, had solved because of external diameter sudden change in connection place increases, and wellhole total length diameter must have been increased this problem, had promptly reduced the drilling well bore, had reduced cost of production.
2, adopt inclined to one side acme thread to connect, anti-stick button ability increases greatly, is more than 2 times of common API connecting thread, goes up, unloads performance and can reach more than 5 times, goes up, unloads not thread gluing.
3, increased the supporting positive cover structure of formulated, the supporting positive cover maximum outside diameter of using is 118mm, be lowered to sleeve pipe and increase erection device in the internal and external screw thread junction, can effectively impel the accuracy of thread connection, and guarantee that external diameter is that the pipe of 114mm is in 7.72 the damaged well time for the 139.7mm wall thickness being lowered to external diameter, do not shake, guarantee normally carrying out of next process.
Four, description of drawings
Fig. 1 is a kind of exemplary construction schematic diagram of the present utility model
Fig. 2 is an another kind of exemplary construction schematic diagram of the present utility model
The specific embodiment
Consult Fig. 1-Fig. 2, direct-connected casing string comprises sleeve A 1, sleeve pipe B7.The external screw thread 2 of sleeve A 1 end is connected with the internal thread 2 of sleeve pipe B7 end, and the junction is congruent gauge structure.Sleeve pipe B7 internal thread small end is provided with interior sealing cone 4, antitorque shoulder 6 in interior sealing cone 4 places are provided with.Sleeve A 1 external screw thread end be provided with sleeve pipe B7 in the sealing cone 4 corresponding external seal conical surfaces 3, the external seal conical surface 3 places are provided with and interior antitorque shoulder 6 corresponding outer antitorque shoulders 5.
Wherein, connecting thread 2 profiles of tooth are inclined to one side acme thread, tooth depth 1.375-1.575mm.Interior sealing cone 4 is 1: 10 with the tapering of the external seal conical surface 3.Interior antitorque shoulder 6 is 3 ° of conical surfaces with outer antitorque shoulder 5.Sleeve A 1 and sleeve pipe B7 link together by supporting positive cover C8.
Technical data of the present utility model is that the outer diameter D of sleeve A 1, sleeve pipe B7, connection internal and external screw thread 2 is 139.7mm, and inner diameter d is 124.26mm, and wall thickness is 7.72mm.Material behavior: yield strength σ
s=670Mpa, tensile strength is σ
b=820Mpa.The height of internal and external screw thread 2 is 1.575mm, 10 ° of spigot surface angles, 3 ° of bearing surface angles.
Claims (5)
1. direct-connected casing string, comprise sleeve A, sleeve pipe B, the external screw thread that it is characterized in that described sleeve A end is connected with the internal thread of sleeve pipe B end, the junction is congruent gauge structure, and pipe B internal thread small end is provided with interior sealing cone, antitorque shoulder in internal thread sealing cone place is provided with, sleeve A external screw thread end be provided with sleeve pipe B in the corresponding external seal conical surface of sealing cone, thread seal conical surface place is provided with and the corresponding outer antitorque shoulder of interior antitorque shoulder outside.
2. direct-connected casing string according to claim 1 is characterized in that described connecting thread profile of tooth is inclined to one side acme thread, tooth depth 1.375-1.575mm.
3. direct-connected casing string according to claim 1 is characterized in that the tapering of described internal thread sealing cone and external screw thread sealing cone is 1: 10.
4. direct-connected casing string according to claim 1 is characterized in that antitorque shoulder of described internal thread and the antitorque shoulder of external screw thread are 3 ° of conical surfaces.
5. direct-connected casing string according to claim 1 is characterized in that described sleeve A and sleeve pipe B link together by supporting positive cover C.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009200279279U CN201705256U (en) | 2009-06-12 | 2009-06-12 | Direct connection type casing string |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009200279279U CN201705256U (en) | 2009-06-12 | 2009-06-12 | Direct connection type casing string |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201705256U true CN201705256U (en) | 2011-01-12 |
Family
ID=43442411
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009200279279U Expired - Fee Related CN201705256U (en) | 2009-06-12 | 2009-06-12 | Direct connection type casing string |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201705256U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105545216A (en) * | 2015-10-27 | 2016-05-04 | 沧州瑞泰石油机械有限公司 | Special thread direct connection type large diameter oil pipe sleeve |
-
2009
- 2009-06-12 CN CN2009200279279U patent/CN201705256U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105545216A (en) * | 2015-10-27 | 2016-05-04 | 沧州瑞泰石油机械有限公司 | Special thread direct connection type large diameter oil pipe sleeve |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110112 Termination date: 20110612 |