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8 tracks per inch (8TPI) thread tooth shape structure

A technology of thread and tooth shape, which is applied in the direction of drilling equipment, earthwork drilling, drill pipe, etc., can solve the problems of poor airtightness, low connection strength, and failure to meet engineering technical requirements, etc. High strength and quick buckle-up effect

Inactive Publication Date: 2012-01-18
DAQING FIRST TECH DEV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

API standard round thread and partial trapezoidal thread joints are routinely used in our country, but the biggest disadvantages of this joint are: low connection strength and poor airtight performance
With the increasingly harsh drilling environment of oil and gas wells and the rapid development of oil and gas production technology, ordinary API standard joints can no longer meet the existing engineering technical requirements

Method used

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  • 8 tracks per inch (8TPI) thread tooth shape structure
  • 8 tracks per inch (8TPI) thread tooth shape structure

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Embodiment Construction

[0015] In order to make the present invention more comprehensible, a preferred embodiment is described in detail below with accompanying drawings.

[0016] A kind of 8TPI thread tooth structure provided by the present invention can be used on oil pipe or casing, such as figure 1 As shown, the tooth height H of the thread teeth is 0.80-1.05 mm, the tooth thickness T is 1.50 mm-1.65 mm, and the thread pitch L is 3.175 mm.

[0017] In the design of special threads, tooth height H and tooth thickness T are key data. Reasonable tooth height H and tooth thickness T have a very important influence on the overall strength of the thread. The tooth height H of the present invention is 0.80-1.05 mm, and the tooth thickness T is 1.50mm to 1.65mm. Such tooth height H and tooth thickness T can ensure that the overall strength of the thread reaches the best value.

[0018] The angle of the load-bearing surface in the thread tooth profile is extremely important, which is related to the relia...

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Abstract

The invention provides an 8 tracks per inch (8TPI) thread tooth shape structure. The structure comprises a thread tooth of which two sides are provided with a guide surface and a bearing surface, and is characterized in that: the tooth height of the thread tooth is 0.80 to 1.05mm, the tooth thickness is 1.50 to 1.65mm, and the pitch is 3.175mm. The invention has the advantages that: 1, the connection strength of a joint is high, can be matched with the strength of a pipe body and the like, and is even higher than the strength of the pipe body, and the structure is suitable for a deep well and an ultra deep well; 2, the structure has high bending resistance and is suitable for an inclined well, a large-displacement well and a horizontal well; 3, the structure is easy to screw on, can be quickly screwed on, is difficult to wrongly screw on, and is suitable for drilling operation in severe environments such as deserts, oceans and the like; 4, the structure has high anti-galling property and can be repeatedly screwed on and off while threads are not damaged; and 5, the structure has high over-torque resistance.

Description

technical field [0001] The invention relates to a threaded structure used for connecting joints of oil pipes or casings in oil drilling. Background technique [0002] Tubing and casing are deep machining products with high requirements and large consumption in the process of oil drilling and production. In actual use, threads are used to connect a single oil pipe or casing into a long pipe string that is thousands of meters long and can withstand hundreds of atmospheres, which is equivalent to a tubular high-pressure vessel. Among them, the technical performance of the threaded connection is the key to ensuring the safety and reliability of the drilling process. API standard round thread and partial trapezoidal thread joints are routinely used in our country, but the biggest disadvantages of this joint are: low connection strength and poor airtight performance. With the increasingly harsh drilling environment of oil and gas wells and the rapid development of oil and gas ex...

Claims

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Application Information

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IPC IPC(8): E21B17/08E21B17/02
Inventor 夏庆华
Owner DAQING FIRST TECH DEV
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