Drilling depth accurate measuring device and method

Abstract

The invention relates to a drilling depth accurate measuring device and method, and the method comprises the steps: enabling a counter to automatically measure the rotation number of turns of a depth measuring wheel when the depth measuring wheel and a drill rod are in rolling contact and continuously rotate, obtaining the descending distance of the drill rod, and obtaining a first hole depth; the depth measuring rope continuously drills and extends into the deep position of the drill hole along with the drill rod, the scale part on the depth measuring rope reads the length of the drill rod in the drill hole, and the second hole depth is obtained; the tension G1 of the active drill rod and the multiple additional drill rods during rod descending is weighed through the weighing module, the tension values G1 and G2 after drilling and rod connecting are measured gradually till the tension Gn of the active drill rod and the multiple additional drill rods at the deepest positions is weighed through the weighing module, and the third hole depth H3 is calculated according to the measured tension values. And then the measured actual hole depth is calibrated by fitting the measured values of the first hole depth, the second hole depth and the third hole depth, so that the problem that the measurement precision is influenced due to misoperation in the measurement and calibration process is avoided.

Description

technical field [0001] The invention relates to the technical field of borehole construction measurement, in particular to a device and method for accurate borehole depth measurement. Background technique [0002] In operations such as oil exploration, coal mining, construction drilling, geological exploration, etc., it is usually necessary to use a drilling rig to drill holes of the required depth on the ground. Drilling underground to form holes. How to accurately know the actual depth of the current borehole is particularly important. In the prior art, the conventional practice is to manually monitor the number of reciprocations of the drilling rig to count the number of drill pipes drilled to obtain the drilling depth. The cost increases, and the artificial statistical error affects the measurement accuracy of the drilling depth; on the other hand, it is also prone to the problem of the stick of the drilling rig, resulting in the uncertainty of the actual drilling dept...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a precise measurement device and method for drilling depth, which aims to solve the problems of the prior art that the authenticity of the measurement data of the hole depth cannot be guaranteed, the labor intensity is high, the measurement error is large, and the precision is low.

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