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Method for judging angle of oil casing knuckle thread form

A technology of oil casing and determination method, which is applied in the direction of casing, drill pipe, earth-moving drilling, etc., can solve the problem that the thread profile angle of oil casing is difficult to accurately determine, and achieves easy measurement, accurate reflection and high detection efficiency. Effect

Active Publication Date: 2018-01-19
BC P INC CHINA NAT PETROLEUM CORP +2
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Problems solved by technology

[0004] The purpose of the present invention is to solve the problem that it is difficult to accurately determine the thread angle of the existing oil casing pipe, and propose a method for determining the thread angle of the oil casing pipe that is convenient for measurement, accurate in reflection and practically applicable. On-site measurement of the thread profile height of the oil casing to determine whether the value of the thread profile angle of the oil casing meets the requirements

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  • Method for judging angle of oil casing knuckle thread form

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Embodiment Construction

[0021] Below in conjunction with specific embodiment, content of the present invention is described in further detail:

[0022] A method for judging the profile angle of round threads of oil casing pipes, comprising the following steps:

[0023] 1) After the casing thread processing is completed, use the profile height gauge to measure the profile height deviation h of the thread;

[0024] 2) Judgment conditions:

[0025] Among them, H is the theoretical thread height of round thread;

[0026] S s The thread reduction value specified in the standard;

[0027] p is the thread pitch;

[0028] A is the upper limit value of the thread profile angle specified in the standard, and K is the processing correction coefficient;

[0029] 3) When the measured thread profile height deviation h satisfies the judging conditions, it is judged that the thread profile angle is qualified, otherwise it is unqualified.

[0030] The above-mentioned processing correction coefficient K is det...

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Abstract

The invention belongs to the field of oil and natural gas industry oil casing thread parameter detection, and particularly relates to a method for judging the angle of an oil casing knuckle thread form. The method comprises the following steps that (1) after casing thread machining is completed, a thread form height deviation value h is measured; (2) a judging criteria is set to be h<k(H-Ss-(p / 2) / tan(A / 2)); and (3) when the measured thread form height deviation value h meets the judging criteria, the angle of the thread form is judged to be qualified, otherwise, the angle of the thread form isjudged to be unqualified. According to the method for judging the angle of the oil casing knuckle thread form, the judging range is obtained through mathematic model calculation, judging is conductedby comparing the measurement value with the judging range, the result is intuitive and clear, and the detection efficiency is high.

Description

technical field [0001] The invention belongs to the field of parameter detection of petroleum casing thread parameters in the petroleum and natural gas industry, and in particular relates to a method for judging the tooth profile angle of the round thread of petroleum casing. Background technique [0002] Oil casing is an important equipment used in the exploitation of oil and gas fields, and its quality directly affects the production safety and production efficiency of oil and gas fields. At present, most of the tubing and casing used in major oilfields implement API-related standards, such as API SPEC 5CT and APISPEC 5B, etc. Among them, API round thread casing has been widely used in major oilfields due to its high processing efficiency and excellent performance. The thread parameters of the round thread casing joints in the relevant standards have clear requirements, specifying the target value and tolerance range of the performance parameters. The manufacturer process...

Claims

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Application Information

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IPC IPC(8): E21B17/08E21B47/00
Inventor 闫凯杨红兵卫栋韩华刚田新新
Owner BC P INC CHINA NAT PETROLEUM CORP
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