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High resolution ratio static natural potential well logging instrument and its measuring method

A self-potential well logging and self-potential technology, which is applied in the field of petroleum geological exploration downhole instruments and high-resolution static self-potential logging instruments, can solve the problems of inability to quantitatively calculate the formation water resistivity Rw, etc., and achieve high resolution Effect

Inactive Publication Date: 2006-06-28
北京九韵能源科技有限责任公司
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  • Summary
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, the existing spontaneous potential SP logging curve cannot be directly used to quantitatively calculate the formation water resistivity Rw, and so far, there is no other logging instrument that can directly and accurately measure the formation water resistivity Rw

Method used

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  • High resolution ratio static natural potential well logging instrument and its measuring method
  • High resolution ratio static natural potential well logging instrument and its measuring method
  • High resolution ratio static natural potential well logging instrument and its measuring method

Examples

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Embodiment 1

[0072] The principle block diagram of embodiment 1 of the high-resolution static natural potential SSP logging instrument of the present invention, as Figure 4 shown. exist Figure 4 Middle: 10--electrode system part; 11--electrode M0; 12--electrode M1; 12'--electrode M1'; 13--electrode M2; 13'--electrode M2'; 14--electrode A1; 14 '--electrode A1'; 15--electrode A2; 15'--electrode A2'; 16--electrode N.

[0073] The present invention is composed of a static natural potential SSP electrode system 10 and a measuring circuit 20 . The electrode system 10 is composed of 9 symmetrically arranged electrode rings embedded on an insulating rod to form the main body of the electrode system, and its arrangement from top to bottom is: A2 (15), A1 (14), M2 (13 ), M1(12), M0(11), M1'(12'), M2'(13'), A1'(14'), A2'(15'). Among them, M1(12), M1'(12'); M2(13), M2'(13'); A1(14), A1'(14'); A2(15), A2'(15') are The electrodes with the same name are short-circuited with wires; M0 (11) is the s...

Embodiment 2

[0091] The principle block diagram of embodiment 2 of the high-resolution static natural potential SSP logging instrument of the present invention, as Figure 5 shown. exist Figure 5 Middle: 10--electrode system part; 11--electrode M0; 12--electrode M1; 12'--electrode M1'; 13--electrode M2; 13'--electrode M2'; 14--electrode A1; 14 '--electrode A1'; 15--electrode A2; 16--electrode N.

[0092]The present invention consists of a static natural potential SSP electrode system 10 and a measuring circuit 20 . The electrode system 10 is composed of 7 symmetrically arranged electrode rings embedded on an insulating rod to form the main body of the electrode system, and the order of arrangement from top to bottom is: A1 (14), M2 (13), M1 (12 ), M0(11), M1'(12'), M2'(13'), A1'(14'). Among them, M1(12), M1'(12'); M2(13), M2'(13'); A1(14), A1'(14') are electrodes with the same name and short-circuited with wires; M0(11) is Static natural potential measurement electrodes; M2(13), M2'(...

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Abstract

A well detector of high resolution in static natural potential consists of SSP electrode system formed by nine electrode rings set symmetrically on a insulated bar as their various the same name electrodes, Mo electrode and N electrode being connected to measuring circuit by wire; measuring circuit for providing current between A1 electrode and A2 electrode according to í¸Vm size to make í¸Vm nearly to be zero and calculating out value of stratum static natural potential when í¸Vm is near zero.

Description

field of invention [0001] The invention relates to a test instrument, in particular to a downhole instrument for petroleum geological prospecting, that is, a high-resolution static natural potential logging instrument and a measuring method thereof. Background technique [0002] Generally speaking, the drilling mud used in the oil drilling process is water-based mud, so for water-based mud oil drilling, there are two main reasons for the natural potential SP in the well: due to the formation water resistivity Rw and drilling The difference in the resistivity Rmf of the mud filtrate produced by the mud causes the diffusion of ions and the adsorption of rock particles to ions, resulting in a diffusion adsorption potential; when the formation pressure is different from the pressure of the mud column, it will occur in the part where the sandstone formation is in contact with the mud. Filtration produces a filter potential. [0003] At present, the measurement principle of natur...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V3/18E21B47/00
Inventor 聂国柱
Owner 北京九韵能源科技有限责任公司
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