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Logging method and logging instrument of natural potential in high resolution

A self-potential logging, high-resolution technology, used in electrical/magnetic detection for logging records, wellbore/well components, earth-moving drilling, etc. The amplitude is greatly affected by the surrounding rock and the resolution is low, so as to achieve the effects of stable measurement value, strong anti-interference ability and high resolution

Inactive Publication Date: 2007-02-21
DAQING PETROLEUM ADMINISTRATION
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Problems solved by technology

[0003] In order to solve the problems of low resolution, signal amplitude greatly affected by surrounding rocks, and measurement susceptible to interference by well field electromagnetic fields caused by the use of ground electrodes as reference electrodes in conventional spontaneous potential logging methods, the present invention provides a high-resolution spontaneous potential logging method And a logging instrument specially designed for the implementation of this method. After the implementation of this method, it has the characteristics of high resolution, stable signal amplitude, and measurement is not easily disturbed by the electromagnetic field of the well site.

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  • Logging method and logging instrument of natural potential in high resolution
  • Logging method and logging instrument of natural potential in high resolution
  • Logging method and logging instrument of natural potential in high resolution

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Embodiment Construction

[0013] The present invention will be further described below in conjunction with accompanying drawing:

[0014] The practicality of the method described in the present invention is based on the results of laboratory core analysis. The natural potential of the argillaceous sandstone formation is mainly the diffusion adsorption potential, the diffusion adsorption potential coefficient of pure mudstone is 59mv, and the diffusion adsorption potential coefficient of pure sandstone formation is -11.6mv, because the measuring electrode M and the electrode N falling on the mudstone formation i The potential difference between must be the smallest, so choose N i As a reference electrode, measure M, N i The potential difference between them can get the natural potential value of the formation.

[0015] Constructed a kind of high-resolution spontaneous potential logging method described in the present invention thus, promptly utilize a kind of logging instrument to select the mudstone ...

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Abstract

The present invention relates to a high-resolution natural potential well-logging method and specially-designed logging instrument for implementing said method. It is characterized by that said instrument shell interior includes a 31-core connector and a collection circuit and control circuit board, can said instrument shell exterior is connected with an electrode system which uses rubber as carrier and contains 16 mutually-insulated electrodes. Besides, said invention also provides the well-logging method by using said logging instrument and its concrete logging steps.

Description

Technical field: [0001] The present invention relates to a method used in logging operations in oil fields and a logging instrument specially designed for implementing the method, in particular to a natural potential logging method and logging instrument with higher resolution. Background technique: [0002] Spontaneous potential logging is one of the earliest logging methods used for formation evaluation, and it is still an important means to classify lithology, evaluate reservoirs, and determine the salinity of formation water, and is a must-test item for completion logging. In the process of oil drilling, the mud used is generally water-based mud. Since the resistivity of formation water is different from that of drilling mud, ion diffusion and rock particle adsorption to ions are caused, resulting in diffusion adsorption potential. Experiments show that the diffusion and adsorption potential coefficient of pure mudstone is 59mv, and the diffusion and adsorption potential...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B49/00G01V3/26
Inventor 王伟男姜亦忠丁柱陈强
Owner DAQING PETROLEUM ADMINISTRATION
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