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Time domain signal processing method for through-casing differential resistivity logging

A technology of differential resistance and time-domain signals, which can be used in measurement, earthwork drilling and production, wellbore/well components, etc., and can solve problems such as complex mechanical structures

Inactive Publication Date: 2021-05-25
TIANJIN UNIV
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  • Abstract
  • Description
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Problems solved by technology

This complicates the mechanics of the instruments used

Method used

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  • Time domain signal processing method for through-casing differential resistivity logging
  • Time domain signal processing method for through-casing differential resistivity logging
  • Time domain signal processing method for through-casing differential resistivity logging

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Embodiment

[0040] The time-domain signal processing method of the casing differential resistivity logging of the present invention comprises the following steps:

[0041] one, figure 1 Shown is the actual logging interface of transient electromagnetic through casing, (a) is the matching natural gamma ray logging curve and magnetic positioning curve, which are used to determine the depth of the formation where the tool is located; (b) is real-time (at a certain The original logging waveforms of four different source distances measured by casing formation resistivity logging at time ) are constantly refreshed during the logging process. In each waveform diagram, there are four moments in which the waveform changes sharply, corresponding to the forward conduction, forward turn-off, reverse conduction and reverse turn-off moments of the excitation waveform of the transient electromagnetic logging transmitting coil. Because the coil current changes greatly at these four moments, the transien...

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Abstract

The invention discloses a time-domain signal processing method for differential resistivity logging through casing: acquiring transient electromagnetic induction receiving waveforms at four moments of forward conduction, forward turn-off, reverse conduction and reverse turn-off; Response difference waveforms 1, 2, and 3 are obtained by subtracting the received waveforms of electromagnetic induction at adjacent depth points; the response difference of adjacent depth points replaces the response difference at the collar to remove the influence of the collar; respectively select the response difference waveforms 1 and 2 at four times , 3, the maximum value is converted into the formation conductivity difference curve; the formation conductivity difference curve at any time in any response difference waveform is integrated to obtain the formation conductivity curve of the measured well section; the same The method is applied to other moments of the response difference waveform to generate the formation conductivity curve of the corresponding well section; the above method is applied to the other two response difference waveforms at four moments to generate the formation conductivity curve of the corresponding well section; The curves are weighted and added together, and the reciprocal is taken to obtain the formation resistivity curve.

Description

technical field [0001] The invention belongs to the technical field of special instruments for measuring physical parameters of casing well formations and evaluating lithology in petroleum engineering well logging construction, and more specifically relates to a time-domain signal processing method for through-casing differential resistivity logging. Background technique [0002] In the process of oil development, formation resistivity measurement under cased well conditions is very important. The formation resistivity measured at different periods or the resistivity distribution information at different depths can be used to evaluate the distribution of remaining oil in the formation during the development process. Adjust the development plan to provide specific basis. The existing through-casing formation resistivity logging method adopts the direct current method, pushes the electrode to the inner wall of the casing, supplies power to the casing and the formation through ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B49/00E21B47/00
CPCE21B47/00E21B49/00
Inventor 沈建国舒敦利沈永进
Owner TIANJIN UNIV
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