Deconvolution specific resistance treatment method of cased well

A processing method and deconvolution technology, which is applied in earth-moving drilling, wellbore/well components, measurement, etc., can solve the problem that the secondary field and apparent conductivity cannot be obtained, and the method for obtaining formation resistivity cannot be accurately given. Unable to obtain further information on formation conductivity and resistivity

Active Publication Date: 2020-05-22
TIANJIN UNIV MARINE TECH RES INST
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Problems solved by technology

[0003] The received signal also includes the direct coupling signal (i.e. the primary field) and the secondary field signal. The traditional method cannot eliminate the primary field irrelevant to the formation conductivity, so that the secondary field and apparent conductivity cannot be obtained, and the formation conductivity and Resistivity information
Subtraction of waveforms measured at adjacent depths at the same source distance can remove all useless signals in the response (primary field and secondary field responses of fluid, casin...

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  • Deconvolution specific resistance treatment method of cased well
  • Deconvolution specific resistance treatment method of cased well
  • Deconvolution specific resistance treatment method of cased well

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[0021] The present invention will be further described below in conjunction with the accompanying drawings, specific data processing examples, and best implementation modes, but the protection scope of the present invention is not limited thereto.

[0022] The key point of the present invention is to eliminate the useless primary field signal by means of making a difference between adjacent depths, and the difficulty is to extract the formation resistivity information through data processing from the electromagnetic induction signal with a large amplitude. Bypassing the problem that the apparent conductivity cannot be obtained directly, the linear relationship between the response difference and the apparent conductivity difference is derived, and it is related to the convolution relationship between the apparent conductivity difference and the longitudinal geometric factor difference, thus obtaining the formation Conductivity curve, take the reciprocal to obtain resistivity cu...

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Abstract

The invention discloses a deconvolution specific resistance treatment method of a cased well. On the basis of the secondary field difference measured by two adjacent depth points, the relation betweenthe secondary field difference and the apparent conductivity difference and stratum conductivity sequence is derived, a stratum conductivity curve is reduced through the deconvolution method, and a stratum specific resistance curve is reduced in a reciprocal manner. The solving problem of the stratum conductivity curve is solved through difference deconvolution; and under the condition that longitudinal geometrical factor spacing is selected correctly, the stratum conductivity can be completely reduced, and the stratum resolution ratio is increased.

Description

technical field [0001] The invention belongs to the technical field of cased well formation physical parameter measurement in petroleum engineering well logging construction, and mainly relates to a cased well deconvolution resistivity processing method. Background technique [0002] In oil exploration and development, well logging is a very important means to evaluate oil and gas reservoirs. In terms of logging technology, the transient electromagnetic through-casing logging technology is developed and improved on the basis of geophysical prospecting and induction logging. Usually, the transmitted signal is a step signal, and transient excitation is used to measure the difference in the cased hole. The transient response waveform of the source distance. The transmitted electromagnetic signal forms an eddy current in the casing and the medium outside the casing, and the secondary field generated by the eddy current passes through the casing again and is received by the rece...

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Application Information

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IPC IPC(8): E21B47/00E21B49/00
CPCE21B47/00E21B49/00Y02A90/30
Inventor 沈建国刘鹏程
Owner TIANJIN UNIV MARINE TECH RES INST
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