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Automatic compensation method for direct coupling signal for induction log

An inductive logging and signal technology, which is applied in the direction of electrical/magnetic detection for logging records, can solve the problems of poor stability, insufficient coil accuracy, time-consuming and labor costs, and achieves high reliability and adaptability. strong effect

Active Publication Date: 2017-08-11
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • Automatic compensation method for direct coupling signal for induction log
  • Automatic compensation method for direct coupling signal for induction log
  • Automatic compensation method for direct coupling signal for induction log

Examples

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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 compensation method for a direct coupling signal for induction log. The method comprises the following steps: stimulating an alternating magnetic field in a fixed frequency, namely, the direct coupling signal, on a ground layer, by utilizing an emitting coil; generating eddy by the ground layer in the alternating magnetic field and outward radiating a secondary induction signal; overlapping the direct coupling signal and the secondary induction signal, thereby forming a compound signal; adopting a digital phase sensitive detection DPSD algorithm for acquiring the amplitude size and the phase position correspondence of the direct coupling signal and the secondary induction signal; controlling a DDS digital frequency synthesizer by a DSP master control module to output a compensation signal which is in similar amplitude and has a 180-degree phase difference with the direct coupling signal; after overlapping the signals, compensating the direct coupling signal to minimum, lastly, extracting the remaining secondary induction signal and adopting for calculating conductivity. According to the method, a software algorithm is adopted for automatically realizing the compensation of the direct coupling signal, a compensating coil hardware structure is avoided, the calibration is not required, the practicability is high and the reliability is higher.

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 Applications(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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