Method and device for determining the characteristics of pipe miter joints

Abstract

The invention discloses a method and device for determining a pipeline oblique connection feature, and belongs to the technical field of pipeline detection. The method comprises the steps of obtaininga pipeline geometric signal, wherein the pipeline geometric signal is obtained through measuring multiple positions on the inner wall circumference of a pipeline via multiple measurement channels bya geometric inner detector when penetrating through the internal part of the pipeline; determining a normal signal segment and an abnormal signal segment from the pipeline geometric signal, wherein the normal signal segment is obtained by measuring a pipeline section which does not have oblique connection in the pipeline, and the abnormal signal segment is obtained by measuring a pipeline sectionwhich has oblique connection in the pipeline; and determining a pipeline oblique connection feature of the pipeline section having oblique connection in the pipeline based on the normal signal segmentand the abnormal signal segment. In the invention, the geometric inner detector can automatically penetrate through the internal part of the pipeline to measure the geometric signal, and the geometric signal is high in precision, so that the operation of determining the pipeline oblique connection feature according to the geometric signal not only saves time and labor, but also is high in precision of the obtained oblique connection angle and oblique connection axial length.

Description

technical field [0001] The invention relates to the technical field of pipeline detection, in particular to a method and a device for determining a miter connection feature of a pipeline. Background technique [0002] In the process of oil and gas development, the extracted oil or natural gas will be transported through pipelines. Usually, pipelines for transporting oil and gas are formed by connecting multiple sections of pipelines. Among them, at the bend of the line, due to the uneven terrain or the construction personnel's illegal operation, the pipelines are welded in the form of girth welds, which is easy to cause the axes of the two pipelines to be not in a straight line, and the two end faces to be welded are welded. There is a certain angular deviation, which is usually referred to as a miter, and is characterized by the pipe miter feature. [0003] Among them, the characteristics of the pipe miter connection include the miter angle and the miter axial length. The...

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Problems solved by technology

[0004] However, it is time-consuming and labor-intensive to excavate on-site pipe sections with mitered joints, which is very inconvenient

Moreover, since the surface of the pipeline is a curved surface and has been buried underground for a long time, the surface quality is poor. Therefore, the measurement accuracy is low when using conventional measuring tools to measure the miter angle and the miter axial length. The reliability of the results is also difficult to guarantee

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