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Method for obtaining gas-phase effective permeability and prediction method of reservoir productivity

A prediction method and permeability technology, which is applied in permeability/surface area analysis, measurement devices, earthwork drilling and production, etc., can solve the problems of inability to obtain the effective permeability of the gas phase of the entire well section, large gas layer productivity errors, etc., and achieve productivity prediction The effects of improved precision, strong regularity, and obvious transformation characteristics

Active Publication Date: 2020-12-01
CHINA OILFIELD SERVICES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Even if the gas-phase effective permeability is obtained through the gas-water phase permeability experiment analysis of some deep cores, but only some depth point data, the continuous gas-phase effective permeability of the whole well section cannot be obtained, and a gas layer can be predicted in a stratum with strong heterogeneity Production capacity error is large

Method used

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  • Method for obtaining gas-phase effective permeability and prediction method of reservoir productivity
  • Method for obtaining gas-phase effective permeability and prediction method of reservoir productivity
  • Method for obtaining gas-phase effective permeability and prediction method of reservoir productivity

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] Statistical samples use the steady-state method of the relative permeability measuring instrument, refer to the Chinese petroleum industry standard SY / T5336-2006 core analysis method, measure the gas-water phase permeability experimental data, and use the permeability measuring instrument to measure the absolute permeability K of the sample.

[0054] Bring the absolute permeability K of each sample into formula (1), the value of parameter a in formula (1) is 0.3775, and the value of parameter b is 1.1368, that is, Kg=0.3775 K 1.1 368.

[0055] The gas-phase effective permeability obtained by calculation and actual measurement is shown in Table 1. It can be seen from Table 1 that the gas phase effective permeability calculated by formula (1) is basically the same as the gas phase effective permeability obtained by actual measurement. The average relative error is 13.2%.

[0056] Table 1 Calculated and actual measured gas phase effective permeability

[0057]

Embodiment 2

[0059] Statistical samples use the steady-state method of the relative permeability measuring instrument, refer to the Chinese petroleum industry standard SY / T5336-2006 core analysis method, measure the gas-water phase permeability experimental data, and use the permeability measuring instrument to measure the absolute permeability K of the sample.

[0060] Bring the absolute permeability K of each sample into formula (1), the value of parameter a in formula (1) is 0.3775, and the value of parameter b is 1.1368, that is, Kg=0.3775 K 1.1368 .

[0061] The gas-phase effective permeability obtained by calculation and actual measurement is shown in Table 2. It can be seen from Table 2 that the gas phase effective permeability calculated by formula (1) is basically the same as the gas phase effective permeability obtained by actual measurement. The average relative error is 26.3%.

[0062] Table 2 Calculated and actual measured gas phase effective permeability

[0063]

Embodiment 3

[0065] Statistical samples use the steady-state method of the relative permeability measuring instrument, refer to the Chinese petroleum industry standard SY / T5336-2006 core analysis method, measure the gas-water phase permeability experimental data, and use the permeability measuring instrument to measure the absolute permeability K of the sample.

[0066] Bring the absolute permeability K of each sample into formula (1), the value of parameter a in formula (1) is 0.3775, and the value of parameter b is 1.1368, that is, Kg=0.3775 K 1.1368 .

[0067] The gas-phase effective permeability obtained by calculation and actual measurement is shown in Table 3. It can be seen from Table 3 that the gas phase effective permeability calculated by formula (1) is basically the same as the gas phase effective permeability obtained by actual measurement. The average relative error is 6.4%.

[0068] Table 3 Calculated and actual measured gas phase effective permeability

[0069]

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Abstract

The invention discloses a method for obtaining gas-phase effective permeability and a prediction method of reservoir productivity. The method comprises the following steps that 1) absolute permeability K of a stratum is obtained; and 2) the absolute permeability K is substituted into a formula (1) to obtain gas-phase effective permeability Kg of rock, wherein the formula (1) is Kg=a.K, the Kg in the formula (1) is the gas-phase effective permeability, the K is the absolute permeability, the value of the parameter a ranges from 0.3 to 0.5, and the value of the parameter b ranges from 1.0 to1.2. According to the method, after the continuous absolute permeability is calculated by utilizing logging information, the whole well section conversion calculation of the reservoir gas-phase effective permeability is carried out, so that related research can be further carried out, the reservoir productivity is predicted, the productivity prediction precision is greatly improved compared with the prior art, and the exploration and development of an oil and gas field can be effectively guided.

Description

technical field [0001] This article involves but is not limited to the method of obtaining gas phase effective permeability and the prediction method of reservoir productivity. Background technique [0002] Absolute rock permeability refers to the permeability measured when there is only one kind of fluid (oil, gas or water) in the rock pores. Its size is only related to the rock pore structure and has nothing to do with the fluid properties. It is called the air permeability, and the permeability calculated by using logging data is the absolute permeability of the reservoir. The effective permeability or phase permeability of rock refers to the permeability measured for one of the fluids when two or more fluids pass through the rock at the same time. The ratio of effective permeability to absolute permeability of rock is called relative permeability. Gas-phase effective permeability is the gas-phase effective permeability of the reservoir in the process of oil-gas-water m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B49/00E21B25/00G01N15/08
CPCE21B49/00E21B25/00G01N15/0826
Inventor 王猛刘志杰徐大年杨玉卿张志强刘海波吴乐军董宇杜本强张朝华
Owner CHINA OILFIELD SERVICES
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