Electrode Measurement Affects Automatic Correction Through-casing Resistivity Logging Method and Device

Abstract

The invention discloses an electrode measurement influence automatic correction through casing resistivity logging method and device. Two potential difference meters with different internal resistance are used for measuring the potential of two meters in an interactive power supply mode, and apparent formation resistivity is calculated according to the obtained potential of a metal casing at a measurement point. Therefore, the influence of electrode measurement environment factor change on measurement results can be automatically eliminated by the electrode measurement influence automatic correction through casing resistivity logging method and device.

Description

technical field [0001] The invention relates to the technical field of geophysical well logging, in particular to a through-casing resistivity logging method and device for automatic correction of electrode measurement effects. Background technique [0002] Through-casing resistivity logging can solve the problem of formation resistivity measurement in cased wells. The application of a new generation of cased-hole logging technology, especially the successful development of the cased-hole resistivity logging tool, provides a new source for dynamic development and monitoring of oil and gas fields. an important means. The cased hole logging has been promoted into a new application field of "formation evaluation", which is an important progress of the cased hole logging technology. Since Kaufman published the measurement method and calculation theory of cased hole resistivity logging in the early 1990s, great breakthroughs have been made in the development of cased hole resist...

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Problems solved by technology

[0003] But now all logging instruments and measurement methods cannot eliminate the influence of the electrode measurement environment and environmental changes (due to poor electrode contact, the presence of crude oil on the casing wall, casing corrosion, etc.), which has become an important issue in casing at present. A Difficult Technical Problem Encountered in Tube Well Resistivity Logging

However, both measurements and simulations have found that changes in the electrode measurement environment have a great influence on the measured results of the cased well resistivity. difference, and even negative anomalies

On the other hand, due to the high conductivity of the metal casing, there is a huge contrast with the resistance change caused by the environmental factors of the electrode measurement, and the randomness of the change of the environmental factors of the electrode measurement, the quantitative measurement and correction of the influence of the environmental factors of the electrode measurement exist. It is very difficult. Well logging experts have already realized the above phenomena. However, the detection and correction of the influence of changes in the electrode measurement environment on the measurement results has not yet found relevant research reports, and there is no solution or correction method. also very insufficient

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