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Physical simulation method for enabling water injection induced micro-fracture extension law to reappear under formation conditions

A technology of formation conditions and physical simulation, applied in measuring devices, suspension and porous material analysis, instruments, etc., can solve the problems of calculating the change of rock core permeability, there is no physical simulation method for water injection micro-fractures, and it cannot be realized.

Inactive Publication Date: 2018-02-27
CHINA UNIV OF PETROLEUM (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This patent realizes the visualization of micro-fractures, but cannot quantitatively calculate the change of core permeability at different times
[0006] In view of the current unclear understanding of the mechanism and law of micro-cracks induced by water injection below the fracture pressure, there is no effective physical simulation method for water injection micro-cracks

Method used

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  • Physical simulation method for enabling water injection induced micro-fracture extension law to reappear under formation conditions
  • Physical simulation method for enabling water injection induced micro-fracture extension law to reappear under formation conditions
  • Physical simulation method for enabling water injection induced micro-fracture extension law to reappear under formation conditions

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Experimental program
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Embodiment 1

[0046] In this embodiment, the experimental core A is selected as a cylindrical core with a diameter of 3.34 cm and a length of 30.2 cm. The core permeability is 0.71mD, the control experiment temperature is 80℃, and the rock fracture pressure is 22MPa. Pressure gauge 3 has a range of 0-35MPa and an accuracy of 0.25. Confining pressure booster pump 6 has a pressure range of 0-35MPa and an accuracy of 0.1MPa. Generally, the confining pressure needs to be greater than the axial pressure. Axial pressure booster pump 7 has a pressure range of 0-35MPa and an accuracy of 0.1MPa.

[0047] Such as figure 1 As shown, a physical simulation method for reproducing the extension law of micro-fractures induced by water injection under formation conditions includes the following steps:

[0048] ① Select the core, clean, dry and saturate the core with oil;

[0049]②Using the triaxial core pressurization experimental system, put the oil-saturated core in the triaxial core holder 2 and plac...

Embodiment 2

[0061] In this embodiment, the experimental core B is selected as a cylindrical core with a diameter of 3.52 cm and a length of 31.4 cm. The core permeability is 0.92mD, the control experiment temperature is 80℃, and the rock fracture pressure is 23MPa. Pressure gauge 3 has a range of 0-35MPa and an accuracy of 0.25. Confining pressure booster pump 6 has a pressure range of 0-35MPa and an accuracy of 0.1MPa. Generally, the confining pressure needs to be greater than the axial pressure. Axial pressure booster pump 7 has a pressure range of 0-35MPa and an accuracy of 0.1MPa.

[0062] Such as figure 1 As shown, a physical simulation method for reproducing the extension law of micro-fractures induced by water injection under formation conditions includes the following steps:

[0063] ① Select the core, clean, dry and saturate the core with oil;

[0064] ②Using the triaxial core pressurization experimental system, put the oil-saturated core in the triaxial core holder 2 and pla...

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Abstract

The invention provides a physical simulation method for enabling a water injection induced micro-fracture extension law to reappear under formation conditions. The method comprises the following steps: selecting a core, cleaning and drying the core, and selecting saturated oil; arranging the core of the saturated oil in a three-axis core holding unit by utilizing a three-axis core pressurized experimental system, placing in a high-temperature environment, applying a confining pressure, and simulating real high-temperature high-pressure formation conditions; enabling the whole core and the coreholding unit to be arranged in a high-temperature high-pressure displacement and nuclear magnetic resonance analysis and imaging system, and scanning a fracture distribution image in the core; solving the original permeability of the tested core; gradually increasing a pressure at the injection end, observing the liquid amount at the outlet end of the core, reading after stabilization, scanning the fracture distribution images in the core at different moments and under different injection pressures, and reversing the core permeability; performing contrastive analysis on changes of the core permeability and fracture distribution laws at different moments. According to the method, quantification and visualization are combined, and dynamic changes of the fractures are monitored in real time.

Description

technical field [0001] The invention relates to the field of exploration and development of low-permeability / tight oil and gas, in particular to a physical simulation method for reproducing the law of extension of micro-fractures induced by water injection under low-permeability / tight oil-gas formation conditions. Background technique [0002] In recent years, with the sharp reduction of conventional oil and gas recoverable resources, the exploration and development of low permeability / tight oil and gas has become a new focus. Due to the general shortage of natural energy in low-permeability / tight oil reservoirs in my country, the reservoir pressure drops rapidly and the production decline rate is fast in the single-use depletion production method, so the development method of water injection to supplement energy is usually used. [0003] Due to the poor physical properties of low-permeability / tight oil reservoirs, it is necessary to inject water into the formation by means ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N15/08
CPCG01N15/082
Inventor 李芳玉汪洋程时清于海洋李猛
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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