A Profile-Based Measurement and Positioning Method for Oil Pipe External Thread Parameters

Abstract

The invention discloses a method for measuring and locating external thread parameters of an oil pipe based on a profile, which determines the external thread profile of the oil pipe to be tested, uses image processing technology to obtain flank line data and fits a straight line equation, according to the profile of the external thread to be measured and The difference of the reference contour positioning line is adjusted to obtain the angle, and the position of the oil pipe to be tested is adjusted to complete the positioning. The invention is suitable for determining the measurement and positioning of various parameters by using the external thread profile of the oil pipe, and is not limited to contact measurement and non-contact measurement.

Description

technical field [0001] The invention belongs to the technical field of oil pipe thread measurement, and in particular relates to a profile-based method for measuring and positioning oil pipe external thread parameters. Background technique [0002] API oil thread is an important connection part of the pipe string used in the exploration and development of the petroleum industry. Whether it is in the API drilling tool thread standard or the oil casing thread standard, there are strict requirements for the inspection of the thread part, such as pitch, tooth height, taper, center Thread parameters such as diameter, ovality and close distance. But at present, at home and abroad, the detection of the above oil pipe thread parameters still completely depends on manual inspection item by item. Regardless of whether it is the factory inspection of oil well pipes or the inspection of individual thread parameters before going into the well in the oil field, the inspection data cannot...

AI Technical Summary

Problems solved by technology

But at present, at home and abroad, the detection of the above oil pipe thread parameters still completely relies on manual inspection item by item.

Regardless of whether it is the factory inspection of oil well pipes or the inspection of individual thread parameters before going into the well in the oil field, the inspection data cannot be shared in real time, resulting in unnecessary duplication of labor, and manual inspection cannot guarantee 100% full coverage (all pipe threads, all parameters) )

[0003] At present, research institutions at home and abroad are studying various contact or non-contact automatic measuring devices to solve the problems of low detection efficiency, poor detection accuracy, and contradictions between manual inspection and automated production of traditional detection technologies. Positioning is the basis of all subsequent measurements. In these measurements In technology, some measurements use auxiliary devices to touch the end face of the pipe to form an auxiliary positioning reference, and some scan the end face of the thread to achieve positioning, but these automatic measurement technologies are more or less limited by the inaccurate positioning of the oil pipe head thread troubled

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