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A Method for Automatic Cancellation of Induction Logging Directly Coupled Signals

An induction logging and signal technology, which is applied in the direction of electric/magnetic detection for logging records, can solve problems such as poor stability, insufficient coil precision, large time consumption and labor costs, and achieve high reliability and adaptability strong effect

Active Publication Date: 2018-12-18
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the wound coil has the disadvantages of insufficient precision and poor stability, and once the assembly is completed, if the cancellation effect of the instrument changes during transportation and use, or the cancellation error occurs due to changes in the use environment, the cancellation must be re-adjusted , which will consume a lot of time and labor costs

Method used

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  • A Method for Automatic Cancellation of Induction Logging Directly Coupled Signals
  • A Method for Automatic Cancellation of Induction Logging Directly Coupled Signals
  • A Method for Automatic Cancellation of Induction Logging Directly Coupled Signals

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Embodiment 1

[0034] In order to make the technical solution of the present invention more clear and complete, before introducing the automatic cancellation method of the induction logging direct coupling signal provided by the present invention, firstly, a pair of the automatic cancellation method of the induction logging direct coupling signal of the embodiment corresponds to the cancellation device Do a detailed introduction:

[0035] Embodiment one:

[0036] An embodiment of the present invention provides an automatic cancellation device for induction logging direct coupling signals, such as figure 1 As shown, it includes an addition operation circuit module 10 , a signal amplification filter conditioning module 3 , an ADC sampling module 4 , an FPGA programmable gate array module 5 , a phase compensation signal output module 6 , and a gain adjustment control module 7 connected in sequence. The input terminals of the addition operation circuit module 10 are respectively connected with ...

Embodiment 2

[0049] The embodiment of the present invention provides a method for automatic cancellation of induction logging direct coupling signals, such as image 3 shown, including the following steps:

[0050] A1. Select a transmitting coil of the induction logging tool to enable the output of the transmitting signal to the formation, and notify the FPGA programmable gate array module to control the reference signal switching module to switch to the corresponding transmitting coil channel.

[0051] Before proceeding to step A1, necessary conventional preprocessing operations are required, including powering on and initializing the DSP main control module and FPGA programmable gate array module, and controlling the DSP main control module to wait in the main function to start sending work instructions, etc.

[0052] A2. Control the receiving coil of the induction logging tool to receive the direct coupling signal from the transmitting coil and the secondary induction signal from the fo...

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Abstract

The invention discloses an automatic cancellation method for induction logging direct coupling signals. A transmitting coil is used to excite a fixed-frequency alternating magnetic field, that is, a direct coupling signal, to the stratum. The geological strata in the alternating magnetic field will generate eddy currents, which will flow to the formation. External radiation secondary induction signal. After the two are superimposed, they become a composite signal. Using the digital phase-sensitive detection DPSP algorithm, the corresponding relationship between the amplitude and phase of the direct-coupled signal and the secondary induction signal is obtained. The DSP main control module controls the output amplitude of the DDS digital frequency synthesizer to be similar. And it is a compensation signal with a phase difference of 180 degrees from the direct-coupled signal. After signal superposition, the direct coupling signal is canceled to the minimum, and finally the remaining secondary induction signal is extracted to participate in the calculation of conductivity. The method automatically realizes the cancellation of the direct coupling signal through a software algorithm, saves the hardware structure of the compensation coil, does not need to be calibrated, has strong practicability and better reliability.

Description

technical field [0001] The invention belongs to the technical field of electromagnetic induction, and in particular relates to the design of an automatic cancellation method for induction logging direct coupling signals. Background technique [0002] The transmitting coil of the induction logging tool generates eddy current in the conductive formation, and the eddy current generates a secondary induction signal carrying formation information to the receiving coil, and the formation information is obtained by measuring the secondary induction signal. However, in the actual measurement process, due to the coupling effect between the transmitting coil and the receiving coil, the receiving coil will also receive the direct coupling signal from the transmitting coil. The direct coupling signal does not carry formation information, and is usually a useless signal, and is generally several orders of magnitude larger than the secondary induction signal. If it is not canceled, the us...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01V3/28
CPCG01V3/28
Inventor 管国云聂在平孙向阳
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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