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Underground electromagnetic flaw detector

A flaw detector and electromagnetic technology, used in wellbore/well components, measurement, earthwork drilling and other directions, can solve the problems of low measurement accuracy and increase measurement time, so as to improve measurement accuracy, increase driving current, ensure Effects of Field Logging Efficiency

Pending Publication Date: 2020-04-07
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to provide a downhole electromagnetic flaw detector, which is used to solve the problem of time-sharing and asynchronous collection of existing electromagnetic flaw detectors, increasing the measurement time and resulting in low measurement accuracy

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  • Underground electromagnetic flaw detector
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Embodiment Construction

[0034] Embodiment of downhole electromagnetic flaw detector:

[0035] The main concept of the present invention is: the receiving system adopts a magnetic field array sensor, and each sensor in the magnetic field array sensor is connected to the processor module for receiving a common clock signal. When data collection is performed, the processor module sends a synchronous collection command to each sensor , Control each sensor to collect at the same time, synchronous acquisition can reduce the cycle time of a single measurement and improve the accuracy of instrument measurement.

[0036] Such as figure 1 As shown, the DSP processor 4 (processor module) is built in the downhole electromagnetic flaw detector 3, and the collected information is uploaded to the upper computer 1 through the data power cable 2, and the upper computer 1 analyzes and processes the signal, and finally judges the production. Well casing integrity. Here we use the data power cable 2 for communication....

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Abstract

The invention relates to an underground electromagnetic flaw detector, and belongs to the field of oil and gas field engineering logging equipment. The underground electromagnetic flaw detector comprises a processor module, a transmitting system and a magnetic field array sensor, wherein the transmitting system and the magnetic field array sensor are connected with the processor module, and the processor module is in communication connection with each sensor in the magnetic field array sensor. During data acquisition, the processor module sends a synchronous acquisition instruction to each sensor to control each sensor to perform simultaneous acquisition. According to the invention, each sensor in the magnetic field array sensor synchronously receives sleeve electromagnetic response characteristics of different angles, and one-time transmitting and simultaneous receiving are achieved, so the single-time collecting period is shortened, the deviation between the recording starting angleand the recording ending angle of each sensor is reduced, the possibility of self-rotation of an instrument is reduced, the measurement accuracy is improved, the requirement for three-dimensional finedetection of a casing pipe is met, and the on-site logging efficiency is guaranteed.

Description

technical field [0001] The invention relates to a downhole electromagnetic flaw detector, which belongs to the field of oil and gas field engineering well logging equipment. Background technique [0002] At present, oil and gas fields are facing the situation that the degree of casing damage and deformation of production wells is increasing year by year. Before carrying out downhole remediation operations, it is necessary to conduct a fine evaluation of casing deformation and damage. Eddy current electromagnetic logging device (also called downhole electromagnetic flaw detector, hereinafter referred to as downhole electromagnetic flaw detector), as a non-destructive and non-contact equipment, is not easily affected by well fluid and scaling and waxing, and has become the most widely used equipment at present. One of the casing inspection techniques applied. [0003] Traditional downhole electromagnetic flaw detectors use self-generating and self-retracting coils as inductio...

Claims

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Application Information

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IPC IPC(8): E21B47/00
CPCE21B47/00
Inventor 张庆生朱德智黄华徐菲张诚李晓蕾苗宏罗庆董凌辰
Owner CHINA PETROLEUM & CHEM CORP
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