Method dedicated for measuring chamfer of male connection end for oil casing and oil tube

A technology for external threaded joints and oil casings, applied in the direction of angle/taper measurement, etc., which can solve difficult measurement, narrow and short cones, and inability to determine whether the chamfer α size of the ends of oil casing and oil pipe male threaded joints is qualified, etc. problems, to achieve the effect of improving measurement efficiency and easy operation

Active Publication Date: 2013-01-23
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Because the end face of the oil casing and oil pipe external thread joint and the cone where the chamfer is located are very narrow and short, the conventional measurement method is limited by the tool, it is very difficult to measure this angle, and it is impossible to determine the end of the oil casing and oil pipe external thread joint Is the size of the chamfer α qualified?

Method used

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  • Method dedicated for measuring chamfer of male connection end for oil casing and oil tube
  • Method dedicated for measuring chamfer of male connection end for oil casing and oil tube
  • Method dedicated for measuring chamfer of male connection end for oil casing and oil tube

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Embodiment

[0023] The embodiment of the present invention provides a special method for measuring the chamfering at the end of the external threaded joint of oil casing and oil pipe. The measuring method principle that the embodiment of the present invention provides:

[0024] α is the end chamfer of oil casing and oil pipe external thread joint, CE is the straight line obtained by the plane truncated end surface passing through the thread axis, CD is the generatrix obtained by the plane truncated cone passing through the thread axis, BCE is obtained by the plane sectional end surface passed through the thread axis A straight line is also the baseline for measurement. ∠ABE is the supplementary angle of the standard angle of chamfering at the end of tubing or casing required by the corresponding standard. In the actual measurement process, AB moves along BE to CD, and encounters such as figure 2 , image 3 , Figure 4 situation shown. Thereby, it can be judged whether the size of th...

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Abstract

The invention discloses a method dedicated for measuring a chamfer of a male connection end for an oil casing and an oil tube, belonging to the technical field of geometric dimensioning measurement of male connections for oil casings and oil tubes. The method comprises the following steps: leaning one side of a standard goniometer against an upper surface of the male connection end and passing through the circle center of an end face of an oil casing or an oil tube; and leaning the other side of the standard goniometer against male threads of the male connection, judging a size relationship between a supplementary angle of a chamfer and an angle of the standard goniometer, and determining whether the chamfer is qualified according to the relationship. According to the method, the chamfer of the male connection end for the oil casing and the oil tube is compared with the standard goniometer to obtain a size scope of the chamfer, and therefore, whether the chamber size of the male connection end for the oil casing and the oil tube is qualified can be determined fast and intuitively.

Description

technical field [0001] The invention relates to the technical field of measuring geometric dimensions of oil casing and oil pipe external thread joints, in particular to a method for measuring the chamfering of the ends of oil casing and oil pipe external thread joints. Background technique [0002] Oil casing and tubing are connected one by one through a special tapered threaded joint with a certain taper to form a string, which is lowered into the well to complete the tasks of cementing and oil production. Threaded joints are divided into external threaded joints and internal threaded joints. In order to ensure the machining dimensional accuracy and interchangeability of the connecting threads of oil casing and tubing, and improve the safety and reliability of the threaded connections of casing and tubing, API (American Petroleum Institute, American Petroleum Institute) SPEC 5B-2008 "Casing, Tubing and There are clear dimensional tolerance requirements for the geometric d...

Claims

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Application Information

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IPC IPC(8): G01B5/24
Inventor 卫尊义白小亮吴健艾裕丰冯娜李光峰田育洲
Owner BC P INC CHINA NAT PETROLEUM CORP
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