CN204960833U - Special screw thread of barb type oil casing coupling - Google Patents
Special screw thread of barb type oil casing coupling Download PDFInfo
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- CN204960833U CN204960833U CN201520729884.4U CN201520729884U CN204960833U CN 204960833 U CN204960833 U CN 204960833U CN 201520729884 U CN201520729884 U CN 201520729884U CN 204960833 U CN204960833 U CN 204960833U
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- screw thread
- thread
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Abstract
The utility model discloses a special screw thread of barb type oil casing coupling, its connection that is used for oil jacket pipe body, the both ends of coupling all are equipped with the internal thread, and connect an oil pipe body respectively, the oil pipe body tip outside is equipped with the external screw thread, oil pipe body and coupling pass through respectively external screw thread and internal thread are connected, external screw thread and internal thread are the special screw thread of barb type, the special screw of barb type is tapered tread trapezoidal partially, and it bears the weight of, and the plane angle is set for and the anticlockwise angle of perpendicular is - 2.5- - 3, and the direction plane angle is set for 15-20. The utility model discloses, because of adopting barb shape threaded connection, the loading end angle can be fine when the moment of torsion is exerted to external force plays anti torsional interaction, and the resistance to compression that has improved the coupling is contracted, the reaction torque effect, has improved the stretch -proofing ability that contracts with the resistance to compression of coupling, also eliminates the adverse effect of the screw thread oil production of twisting the carried forward shutoff simultaneously, has improved the life of coupling.
Description
Technical field
The utility model belongs to oil exploitation drilling equipment technical field, relates to the tubing round thread link technique of drilling equipment, particularly a kind of barb type special thread oil casing box cupling.
Background technology
The tubing and casing of API standard is the most frequently used tubing and casing of China, and the leading products of each tubing and casing factory of Ye Shi China, this product technology is ripe, is easy to processing., structurally still there are some intrinsic defects in this tubing and casing, as above detains that efficiency is low, resistance to torsion is poor and the easy thread gluing of screw thread etc., limits the use of API tubing and casing.
Along with the world is to the reduction year by year of the sharply soaring of fossil energy demand and oil allowable exploitation, the direction of extraction of current oil exploitation field forward deep-well, ultradeep well, high-pressure oil-gas well, thick oil thermal extraction, directional well etc. progressively develops, and proposes more and more harsher technical requirements thus to the sealing box cupling between petroleum pipeline and pipe.In the past a large amount of API (American Petroleum Institute (API)) standard round screw thread of using and buttress thread oil casing collar gas tightness, on detain the demand of the Oil/gas Well that all can not meet mining environment inclement condition in efficiency and resistance to torsion.People are forced to remove research and development performance special thread oil casing box cupling more reliably.
Summary of the invention
The purpose of this utility model is to provide a kind of barb type special thread oil casing box cupling, to improve shackle efficiency and anti-compression properties on it, makes the oil gas hole condition of its inclement condition that more conforms.
In order to solve the problems of the technologies described above, the utility model provides a kind of barb type special thread oil casing, and it is for the connection of tubing and casing body 1, and the two ends of described box cupling 3 are equipped with internal thread 4, and connect an oil pipe body 1 respectively, be provided with external screw thread 2 outside described oil pipe body 1 end; Described oil pipe body 1 is connected with internal thread 4 respectively by described external screw thread 2 with box cupling 3, described external screw thread 2 and internal thread 4 are barb type special thread, described barb type special thread is partially trapezoidal tapered tread, its bearing surface angle Q sets with the counter clockwise direction angle of vertical plane as-2.5 ° ~-3 °, and spigot surface angle D is set in 15 ° ~ 20 °.
Wherein, the pitch P of described external screw thread 2 and internal thread 4 is set as 4 teeth/in, and thread crest is parallel to tubing bus.
The utility model, compared with prior art, because adopting barb-shaped being threaded, when external force applies moment of torsion, bearing surface angle can well play torque resistant effect, improve incompressible, the reaction torque effect of box cupling, improve box cupling stretch-proof and incompressible ability, also eliminate the adverse effect of twisting the dope generation connecing rear shutoff simultaneously, improve the application life of box cupling.
Accompanying drawing explanation
Fig. 1 is structure first schematic diagram of the present utility model;
Fig. 2 is structure second schematic diagram of the present utility model;
Fig. 3 is structure of the present utility model 3rd schematic diagram;
Fig. 4 is the enlarged diagram of the utility model helicitic texture;
In figure, 1-casing pipe, 2-external screw thread, 3-box cupling, 4-internal thread, Q-bearing surface angle, D-spigot surface angle, P-pitch.
Detailed description of the invention
Below in conjunction with the drawings and specific embodiments, the present invention is described in further detail.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.
Should be noted that, " connection " described in the application and the word for expressing " connection ", as " being connected ", " being connected " etc., both having comprised a certain parts with another parts is directly connected, and also comprises a certain parts and is connected with another parts by miscellaneous part.
As shown in Figure 1, Figure 2, Figure 3, Figure 4, the utility model provides a kind of barb type special thread oil casing box cupling, it is for the connection of tubing and casing body 1, the two ends of described box cupling 3 are equipped with internal thread 4, and connect an oil pipe body 1 respectively, be provided with external screw thread 2 outside described oil pipe body 1 end; Described oil pipe body 1 is connected with internal thread 4 respectively by described external screw thread 2 with box cupling 3, described external screw thread 2 and internal thread 4 are barb type special thread, described barb type special thread is partially trapezoidal tapered tread, its bearing surface angle Q sets with the counter clockwise direction angle of vertical plane as-2.5 ° ~-3 °, and spigot surface angle D is set in 15 ° ~ 20 °.
Wherein, the pitch P of described external screw thread 2 and internal thread 4 is set as 4 teeth/in, and thread crest is parallel to tubing bus.Because adopting coarse pitch design, compared with existing product, break-out speed and production efficiency in raising.
The utility model, compared with prior art, because adopting barb-shaped being threaded, when external force applies moment of torsion, bearing surface angle can well play torque resistant effect, improve incompressible, the reaction torque effect of box cupling, improve box cupling stretch-proof and incompressible ability, also eliminate the adverse effect of twisting the dope generation connecing rear shutoff simultaneously, improve the application life of box cupling.
The above is only the preferred embodiment of the present invention; it should be pointed out that for those skilled in the art, under the premise without departing from the principles 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 (2)
1. a barb type special thread oil casing box cupling, it is for the connection of tubing and casing body (1), it is characterized in that, the two ends of described box cupling (3) are equipped with internal thread (4), and connect an oil pipe body (1) respectively, external screw thread (2) is provided with outside described oil pipe body (1) end, described oil pipe body (1) is connected with internal thread (4) respectively by described external screw thread (2) with box cupling (3), described external screw thread (2) and internal thread (4) are barb type special thread, described barb type special thread is partially trapezoidal tapered tread, its bearing surface angle (Q) sets with the counter clockwise direction angle of vertical plane as-2.5 ° ~-3 °, spigot surface angle (D) is set in 15 ° ~ 20 °.
2. a kind of barb type special thread oil casing box cupling according to claim 1, it is characterized in that, the pitch P of described external screw thread (2) and internal thread (4) is set as 4 teeth/in, and thread crest is parallel to tubing bus.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520729884.4U CN204960833U (en) | 2015-09-18 | 2015-09-18 | Special screw thread of barb type oil casing coupling |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520729884.4U CN204960833U (en) | 2015-09-18 | 2015-09-18 | Special screw thread of barb type oil casing coupling |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204960833U true CN204960833U (en) | 2016-01-13 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520729884.4U Active CN204960833U (en) | 2015-09-18 | 2015-09-18 | Special screw thread of barb type oil casing coupling |
Country Status (1)
| Country | Link |
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| CN (1) | CN204960833U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106150396A (en) * | 2016-08-30 | 2016-11-23 | 天津德华石油装备制造有限公司 | A kind of offshore drill uses riser pipe special thread female joint |
-
2015
- 2015-09-18 CN CN201520729884.4U patent/CN204960833U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106150396A (en) * | 2016-08-30 | 2016-11-23 | 天津德华石油装备制造有限公司 | A kind of offshore drill uses riser pipe special thread female joint |
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|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |