Downhole drilling depth measuring method and system based on time domain reflection

Through the method based on time domain reflection, the propagation time and wave speed of the pulse signal are used to calculate the drilling depth, which solves the measurement inaccuracy problem caused by cable deformation and other factors in the prior art, and achieves higher measurement accuracy and signal stability.

CN119712066APending Publication Date: 2025-03-28XIAN FARADAY ELECTRONICS TECH
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Patent Information

Application Number
CN202510239538.6
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-03-03
Publication Date
2025-03-28

AI Technical Summary

Technical Problem

The existing drilling depth measurement methods have insufficient accuracy through cable length measurement, which are affected by factors such as cable elastic deformation, slippage and drilling friction.

Method used

The time domain reflection-based method is adopted, by injecting pulse signals at the head end of the cable to be tested and recording the reception time of the reflected signal, the time difference and pulse wave speed are calculated to determine the drilling depth, and the influence of factors such as cable deformation is avoided.

Benefits of technology

Improves the accuracy of drilling depth measurement, reduces measurement errors due to cable elastic deformation and other factors, and enhances signal stability and accuracy through signal filtering and waveform correction techniques.

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Abstract

The invention discloses an underground drilling depth measurement method and system based on time domain reflection, and belongs to the technical field of drilling measurement, and the technical scheme comprises the steps: injecting a first pulse signal at the head end of a to-be-measured cable, and receiving a second pulse signal which is a reflection signal of the first pulse signal at the tail end of the to-be-measured cable, the to-be-tested cable is located in a to-be-tested well, and the head end of the to-be-tested cable is located at the wellhead of the to-be-tested well; the injection time of the first pulse signal and the receiving time of the second pulse signal are recorded, and the time difference between the injection time and the receiving time is obtained; obtaining the depth of the to-be-measured well according to the time difference and the pulse wave velocity; measurement is carried out based on the time domain reflection principle, the principle is simple and easy to understand, the actual operation difficulty is small, the sensitivity is high, the problem of inaccurate measurement caused by cable tension and cable elastic deformation in the prior art is solved, and meanwhile, the signal processing and waveform correction algorithm is adopted, so that the measurement accuracy is further improved.
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