Porosity effective stress coefficient determination method based on nuclear magnetic resonance
A technology of effective stress and nuclear magnetic resonance, which is applied in the analysis of nuclear magnetic resonance, material analysis through resonance, and measuring devices, can solve problems such as low precision, time-consuming and laborious, and reduce the influence of human factors. Strong, high success rate effect
Inactive Publication Date: 2021-03-16
SOUTHWEST PETROLEUM UNIV
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Problems solved by technology
[0005] The purpose of the present invention is: in order to solve the current time-consuming and labor-intensive method of calculating the effective stress coefficient of porosity by physical experiments, and the accuracy is low. Determination experiment, accurate calculation of effective stress coefficient of porosity, saving time and effort, high accuracy, strong scalability
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[0034] The present invention will be further described below in conjunction with the embodiments and the accompanying drawings.
[0035] The invention provides a method for measuring the effective stress coefficient of porosity based on nuclear magnetic resonance, figure 1 As the technical roadmap of this method, the method includes the following steps:
[0036] S100. Carry out permeability measurement experiments of rock samples under different confining pressure and internal pressure combinations by means of confining pressure drop and internal pressure. When the measured permeability value under a certain confining pressure and internal pressure combination is constant, use nuclear magnetic equipment To measure the T2 spectrum of the rock sample under this condition, the specific steps are:
[0037] S101. Using formation water to saturate the rock sample, test to obtain the T2 spectrum of the sample in the initial state;
[0038] S102. Put the sample into the core holder,...
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The invention relates to a porosity effective stress coefficient determination method based on nuclear magnetic resonance, and belongs to the field of rock mechanics effective stress coefficient calculation. In order to solve the problems of time consumption, labor consumption, low precision and the like of the existing method for calculating the porosity effective stress coefficient by using a physical experiment, the invention adopts the technical scheme that permeability determination experiments of a rock sample under different pressure combination conditions are carried out in a mode of constant confining pressure drop internal pressure, after the determined permeability value under a certain confining pressure and internal pressure combination is constant, a T2 spectrogram of the rock sample under the condition is measured by using nuclear magnetic equipment, porosity values under different confining pressure and internal pressure combination conditions are obtained by analysis,and experimental data is processed according to the definition of porosity effective stress coefficients, thereby obtaining porosity effective stress coefficient values. Based on a nuclear magnetism on-line displacement system, permeability determination experiments of the rock sample under different pressure combination conditions are carried out, the porosity effective stress coefficient is accurately calculated, time and labor are saved, the accuracy is high, and the generalizability is high.
Description
technical field [0001] The invention relates to a method for measuring the effective stress coefficient of porosity based on nuclear magnetic resonance, and belongs to the field of calculating the effective stress coefficient of rock mechanics. Background technique [0002] With the development of oil and gas reservoirs, the stress state of the reservoir changes, which causes corresponding changes in the porosity and permeability of the reservoir. A large number of experiments have shown that the range of porosity changes with effective stress is small, but this change cannot be ignored in the process of oil and gas production. The theoretical study of stress sensitivity in low-permeability oil and gas reservoirs has an important impact on actual production. Only by clarifying the mechanism of porosity change with effective stress can we make corresponding production measures to compete for storage and increase production. [0003] Through investigation, it is found that th...
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IPC IPC(8): G01N24/08G01N15/08
CPCG01N15/08G01N15/0826G01N15/088G01N24/081G01N2015/0846
Inventor 李溢龙李晓平卢虹林谭晓华孟展刘蜀东
Owner SOUTHWEST PETROLEUM UNIV