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Time domain measurement method for ultra-deep resistivity logging

A technology of resistivity logging and time-domain measurement, which is applied in the direction of electric/magnetic detection, measurement, and electromagnetic wave detection for logging records. It can solve the problem of high real-time data transmission and does not meet the high-speed communication sequence. Requirements, long communication distance and other issues, achieve the effect of low power consumption, simple circuit wiring design and energy saving

Active Publication Date: 2021-01-05
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Since the receiving and acquisition module circuit is far away from the data measurement and control module, the communication distance between them is very long, and the real-time requirements of data transmission are very high. At this time, if the conventional LVDS (Low Voltage Differential Signal) communication bus is still used, it will certainly not meet the requirements. , the reason is: first of all, for tens of meters long instruments, the short sections of the instrument strings are spliced ​​together one by one, and it is basically impossible to connect a long multi-strand communication wire to each section; secondly, the communication distance is too far It also does not meet the timing requirements of high-speed communication; therefore, the present invention proposes a time-domain measurement method and measurement device for ultra-deep resistivity, which can solve the above-mentioned technical problems

Method used

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  • Time domain measurement method for ultra-deep resistivity logging
  • Time domain measurement method for ultra-deep resistivity logging
  • Time domain measurement method for ultra-deep resistivity logging

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Embodiment 1

[0043] The embodiment of the present invention provides a time-domain measurement method for ultra-deep resistivity logging, such as figure 1 shown, including: including:

[0044] The measurement control module 3, as the control center of the entire measurement device, enables the transmission control module 2 to output a square wave transmission signal of a certain fixed frequency, and performs related FFT conversion and time delay characteristic analysis on the sampled measurement data, and obtains The final resistivity data is communicated with the main control storage module 4, and the data is uploaded in real time to the main control storage module 4FLASH for storage;

[0045] The transmission control module 2 is used to receive the square wave signal, amplify the square wave signal through a power amplifier chip or a transistor and output it to the transmission antenna 1;

[0046] The transmitting antenna 1 excites periodic high-power orthogonally transformed electromag...

Embodiment 2

[0074] The embodiment of the present invention provides a time-domain measurement method for ultra-deep resistivity logging, such as Figure 10 shown, including: including:

[0075] A1. The instrument is powered on, and the module circuit units of the measurement control module 3, the emission control module 2, the main control storage module 4, the first receiving module 6 and the second receiving module 8 in the measuring device are powered on and initialized, and the measuring device completes the self-test And in the standby state, the encoding communication bus 5 is in an idle state, and the encoding communication bus 5 is a single-core cable.

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Abstract

The invention discloses a time domain measurement method for ultra-deep resistivity logging. The detection depth is greatly increased by increasing the distance between a transmitting antenna and a receiving antenna. Each circuit module is divided into a plurality of instrument short sections and then spliced, and meanwhile, a single-core cable in an underground instrument string is used for transmitting a 32V power supply and also serves as a communication carrier, so that communication interconnection among the circuit modules in the instrument string is realized. The single-core cable alsopropagates synchronous pulses, so that signal receiving and data processing timing synchronization of each receiving module is realized. A DSP main controller of a measurement control module calculates signal phase shift and signal amplitude according to the time delay and time domain characteristics of each received signal and an FFT conversion result, finally inverts a formation resistivity result, and finally uploads all measurement data and resistivity result data to a FLASH chip of a main control storage module for storage, thereby finishing periodic measurement.

Description

technical field [0001] The invention relates to the technical field of resistivity logging, in particular to a time-domain measurement method for ultra-deep resistivity logging. Background technique [0002] Logging while drilling is a relatively common technology. Compared with traditional wireline logging, logging while drilling has the advantages of good real-time performance, high logging accuracy, and saving logging costs. Logging or when the operation is difficult under some special formation conditions and the drilling time is too much, logging while drilling must be used instead of wireline logging. [0003] In recent years, with the rapid development of logging technology, various LWD tools have emerged in an endless stream, and the measurement accuracy and detection depth have also been continuously enhanced. On this basis, the resistivity measurement while drilling has also been applied to a certain extent. On the basis of resistivity measurement, the detection d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B47/12E21B47/13G01V3/30
CPCE21B47/12G01V3/30Y02A90/30
Inventor 管国云孟敏陈涌频孙向阳胡俊聂在平
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA