Method for detecting shape of large-diameter vertical shaft hole

Abstract

The invention discloses a method for detecting a shape of a large-diameter vertical shaft hole. The method for detecting the shape of the large-diameter vertical shaft hole comprises the following steps that the vertical shaft hole is regarded as two concentric shaft holes, the size of the diameter of the inner shaft hole is set, and the inner shaft hole is regarded as a perpendicular shaft hole; the center of the shaft hole is set as the origin of coordinates, a WE direction and an NS direction which are perpendicular to each other are determined on the circumference of the inner shaft hole to serve as coordinate axes, and the four intersection points with the circumference are X, X', Y and Y' respectively and are regarded as detection points; a logging instrument is arranged in a shaft mouth and is adjusted to be level, detection parameters are set, detection probes are lowered at the four detection points of the shaft hole respectively and are maintained to be in a natural sagging state, hole diameter detection is carried out by using ultrasonic waves along with the lowering of the probes, and distance curves of the four points to the wall of the shaft hole are obtained respectively; hole shape detection images formed by the four detection points are spliced in the WE direction and the NS direction, and lastly a complete shaft hole shape image is displayed. The method for detecting the shape of the large-diameter vertical shaft hole is especially suitable for shape detection of holes of large-diameter vertical shafts with high-concentration media.

Description

technical field [0001] The invention relates to a method for detecting the shape of a wellbore by using an ordinary well logging instrument, in particular to a method for detecting the hole shape of a large-diameter shaft in a high-density medium, and belongs to the technical field of large-diameter shaft construction in mines. Background technique [0002] In the construction of mine shaft engineering, the mechanical drilling method is generally used to drill the hole with the mud circulating fluid. The shape of the hole, especially the size of the hole, is one of the main indicators for testing the quality of the hole. At present, when inspecting the hole quality of the shaft wellbore, the detection probe is usually lowered into the hole from the center of the well hole, and the hole shape is detected by ultrasonic waves. Ordinary logging tools for testing generally have their testing range or testing accuracy. When the diameter of the wellbore is large, especially whe...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a method for detecting the hole shape of a large-diameter shaft in a high-density medium, to solve the problem that it is difficult to effectively detect the hole shape of a large-diameter shaft in the existing hole shape measurement method, and to improve the detection accuracy of the hole shape

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