High-resolution focusing method of array laterolog tool

Abstract

The invention relates to a high-resolution focusing method of an array laterolog tool. The tool comprises an array lateral electrode system; the array lateral electrode system is composed of a main electrode A0, six groups of symmetrical focusing electrodes and six groups of symmetrical sampling electrodes; an electric field distribution of mutually independent six operating modes is established by the use of main focusing with four-path auxiliary focusing; the electric field distribution of the first operating mode is an electric field of mud measuring mode MODE0; other five operating modes are the electric fields of operating modes from MODE1 to MODE5. The method has the advantages that the mutually independent electric field distribution can be established by the use of the main focusing with four-path auxiliary focusing, the electric field distribution of different frequencies deepens gradually with increase in the number of auxiliary focusing control circuits, logging depth of the tool increases gradually, and fine division of a stratum is achieved.

Description

technical field [0001] The invention belongs to the technical field of resistivity imaging well logging methods, in particular to a focusing method of a high-resolution array lateral logging instrument mainly used for oil exploration well logging. Background technique [0002] At present, the traditional electrical logging technology commonly used in China is mainly traditional dual laterometry, which has played an important role in oilfield exploration and development. However, with the continuous improvement of oilfield development, the formation information obtained by traditional dual laterolog Shortcomings such as inability to describe the invasion profile in detail and low vertical resolution can no longer meet the requirements of well logging interpretation, which has become a bottleneck in the analysis and interpretation of formation reservoirs; In the case of well tools close to the casing (Groningen effect) or drill pipe transport logging (horizontal logging), they...

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Problems solved by technology

[0002] At present, the traditional electrical logging technology commonly used in China is mainly traditional dual laterometry, which has played an important role in oilfield exploration and development. However, with the continuous improvement of oilfield development, the formation information obtained by traditional dual laterolog Shortcomings such as inability to describe the invasion profile in detail and low vertical resolution can no longer meet the requirements of well logging interpretation, which has become a bottleneck in the analysis and interpretation of formation reservoirs; Well instrumentation close to the casing (Groningen effect) or drill pipe transport logging (horizontal logging) often cannot provide true formation information

Limitations of conventional dual laterolog techniques, sometimes leading to sub-optimal development decisions and even lost development opportunities

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