CN102852470A - Thread structure with large-caliber double-head thread oil casing pipe - Google Patents
Thread structure with large-caliber double-head thread oil casing pipe Download PDFInfo
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- CN102852470A CN102852470A CN 201210380783 CN201210380783A CN102852470A CN 102852470 A CN102852470 A CN 102852470A CN 201210380783 CN201210380783 CN 201210380783 CN 201210380783 A CN201210380783 A CN 201210380783A CN 102852470 A CN102852470 A CN 102852470A
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Abstract
The invention discloses a thread structure with a large-caliber double-head thread oil casing pipe. The thread structure comprises an external thread and an internal thread; the threads are saw-tooth-shaped threads; each thread comprises a bearing face, a non-bearing face, a tooth top face and a tooth root face; the tooth top face and the tooth root face are parallel to middle radial lines of the threads; and the conical degree of the radial lines of the threads is 1 to 7.5. Compared with the prior art, the thread structure with the large-caliber double-head thread oil casing pipe in the structure provided by the invention has the beneficial effects of easiness in buckling, high buckling speed and high efficiency. The thread structure is equal to a casing pipe raw material on the aspect of mechanical property, so that the using properties can be prevented from being influenced by the high buckling speed in operation; and the thread connection has high strength.
Description
Technical field
The present invention relates to petroleum works downhole tubular goods field, especially a kind of helicitic texture of heavy caliber double thread petroleum casing pipe.
Background technology
Heavy caliber petroleum is applicable to each elephant such as domestic Tarim Basin, grand celebration, the Liaohe River, Xinjiang (Kelamayi), Bohai Bay Oil, oil field, the East Sea, Eastern South China Sea, THE WESTERN SOUTH CHINA SEA and triumph with series sleeve, be applied to exploration and the production of Oil/gas Well mainly as surface pipe.
Along with shift to western part in the main battlefield of China's oil, natural gas exploration and development, the strategy in " Stabilizing Oil Production of Eastern China, development western part " forms in recent years.The oil well in west area belongs to deep-well mostly, and complex geologic conditions, and this just has higher requirement to kind, the specification of sleeve pipe.Develop oil, the gas deep-well of this complex geologic conditions, J 55 grade of steels are generally adopted with major diameter (609.60mm) petroleum casing pipe in the oil field; Along with the exploitation of offshore oil, also increasing to the demand of Large-sized High-strength Oil Casing.
For large-sized oil casing, if the mode that adopts API round thread or buttress thread to connect, threading on body, machining internal thread on box cupling, internal and external screw thread is connected to form tubing string, this form that is threaded, and pipe diameter is little, the box cupling diameter is large, and pipe is comparatively difficult under some specific occasion; Be the double thread petroleum casing pipe and adopt direct-connected petroleum casing pipe, the screw thread processing difficulties is difficult for make-up, and make-up speed is slower.
Summary of the invention
The objective of the invention is to overcome defective of the prior art, provide a kind of make-up that is easy to, and make-up speed is fast, bonding strength is high, the heavy caliber double thread petroleum casing screw structure of good mechanical performance.
For addressing the above problem, the helicitic texture of a kind of heavy caliber double thread petroleum casing pipe of the present invention comprises external screw thread and internal thread, it is characterized in that: described screw thread is saw-tooth thread, comprises bearing surface, non-bearing face, crest top land and root face; Wherein crest top land, root face parallel with pitch diameter of thread line, and the tapering of pitch diameter of thread line is 1:7.5.
The angle α of described bearing surface and body axis vertical plane is negative 3 °.
The angle β of described non-bearing face and pitch diameter of thread line is 60 °.
Adopt the helicitic texture of the heavy caliber double thread petroleum casing pipe of structure of the present invention, compared with prior art have following beneficial effect: 1) easily make-up, make-up speed are fast, and efficient is high, the shackle activity duration approximately 50%～70% in the saving; 2) be equal to the sleeve pipe mother metal at aspects such as mechanical properties, can't affect because make-up speed is fast functional performance during operation; 3) intensity that is threaded is high, reaches 100% of body.
Description of drawings
Fig. 1 is the structural representation of heavy caliber double thread petroleum casing pipe.
Fig. 2 is the schematic diagram of heavy caliber double thread petroleum casing screw structure of the present invention.
Fig. 3 is the partial enlarged drawing of A section among Fig. 2.
Among the figure: body 1; External screw thread 2a; Internal thread 2b; Bearing surface 201; Non-bearing face 202; Crest top land 203; Root face 204; Public access head end 3a; Female joint end 3b; Pitch diameter of thread line L; Body axis H; The angle α of bearing surface and body axis vertical plane; The angle β of non-bearing face and crest top land
The specific embodiment
In order to make those skilled in the art person understand better technical solution of the present invention, the present invention is described in further detail below in conjunction with drawings and embodiments.
As shown in Figure 1, 2, a kind of heavy caliber double thread petroleum casing pipe comprises sleeve body 1, and an end of described body 1 is the public access head end 3a that is provided with external screw thread 2a, and the body other end is the female joint end 3b that is provided with internal thread 2b; Described internal and external screw thread 2b, 2a can cooperatively interact, thereby a plurality of petroleum casing pipes can corresponding be interconnected with cooperating of female joint end 3b by public access head end 3a, thereby saved the box cupling structure of traditional API standard, be convenient to petroleum casing pipe in the assembling of multiple occasion.
The helicitic texture of heavy caliber double thread petroleum casing pipe of the present invention comprises internal and external screw thread 2b, 2a, and described screw thread is saw-tooth thread, comprises bearing surface 201, non-bearing face 202, crest top land 203 and root face 204; Wherein crest top land 203, root face 204 parallel with pitch diameter of thread line L, and the tapering of pitch diameter of thread line L is 1:7.5, and the angle β of described non-bearing face and crest top land is 60 °.The petroleum casing pipe of this structure, the easy make-up of internal and external screw thread 2b, 2a, make-up speed are fast, and efficient is high, can save the shackle activity duration approximately 50%～70%.
Described bearing surface 201 is negative 3 ° with the angle α of body axis H vertical plane, as shown in Figure 3, it is outward-dipping 3 ° of bearing surface on the external screw thread 2b, bearing surface on the internal thread 2a slopes inwardly 3 °, thereby when making between the bearing surface mutually interlock, can guarantee that bonding strength is high between internal and external screw thread 2b, the 2a, reach 100% of body, and be equal to the sleeve pipe mother metal at aspects such as mechanical properties, can't affect because make-up speed is fast functional performance during operation.
The above only is preferred embodiment of the present invention; should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the principle of the invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (3)
1. the helicitic texture of a heavy caliber double thread petroleum casing pipe comprises external screw thread and internal thread, it is characterized in that: described screw thread is saw-tooth thread, comprises bearing surface, non-bearing face, crest top land and root face; Wherein crest top land, root face parallel with pitch diameter of thread line, and the tapering of pitch diameter of thread line is 1:7.5.
2. the helicitic texture of heavy caliber double thread petroleum casing pipe as claimed in claim 1, it is characterized in that: the angle α of described bearing surface and body axis vertical plane is negative 3 °.
3. the helicitic texture of heavy caliber double thread petroleum casing pipe as claimed in claim 2, it is characterized in that: the angle β of described non-bearing face and pitch diameter of thread line is 60 °.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201210380783 CN102852470A (en) | 2012-10-09 | 2012-10-09 | Thread structure with large-caliber double-head thread oil casing pipe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201210380783 CN102852470A (en) | 2012-10-09 | 2012-10-09 | Thread structure with large-caliber double-head thread oil casing pipe |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102852470A true CN102852470A (en) | 2013-01-02 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201210380783 Pending CN102852470A (en) | 2012-10-09 | 2012-10-09 | Thread structure with large-caliber double-head thread oil casing pipe |
Country Status (1)
| Country | Link |
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| CN (1) | CN102852470A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104632097A (en) * | 2013-11-12 | 2015-05-20 | 天津德华石油装备制造有限公司 | Special buttress thread oil casing pipe connecting joint |
-
2012
- 2012-10-09 CN CN 201210380783 patent/CN102852470A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104632097A (en) * | 2013-11-12 | 2015-05-20 | 天津德华石油装备制造有限公司 | Special buttress thread oil casing pipe connecting joint |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20130102 |