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Mutual correlation technology for measuring permeability stress sensitivity of ultra-low permeability rocks

A technology of stress sensitivity and permeability, which is applied in the direction of permeability/surface area analysis, measuring device, suspension and porous material analysis, etc., can solve the problem that the accuracy is affected by temperature noise, difficult to measure permeability stress sensitivity, and difficult pore pressure curve Fitting and other issues to achieve the effect of improving accuracy and stability

Active Publication Date: 2014-01-22
CHINA UNIV OF PETROLEUM (BEIJING)
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Problems solved by technology

Otherwise, small temperature and environmental disturbances may cause the pore pressure curve to be difficult to fit
Currently commonly used steady-state method and pulse decay method to measure ultra-low permeability are not stable enough, and the accuracy is also affected by temperature noise, etc., making it more difficult to measure the stress sensitivity of permeability

Method used

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  • Mutual correlation technology for measuring permeability stress sensitivity of ultra-low permeability rocks
  • Mutual correlation technology for measuring permeability stress sensitivity of ultra-low permeability rocks
  • Mutual correlation technology for measuring permeability stress sensitivity of ultra-low permeability rocks

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Embodiment Construction

[0020] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention more clear, the embodiments of the present invention will be further described in detail below in conjunction with the accompanying drawings. Here, the exemplary embodiments and descriptions of the present invention are used to explain the present invention, but not to limit the present invention.

[0021] The main problems of existing technologies for measuring ultra-low permeability are long measurement time, low precision, and poor stability. Therefore, it is more difficult to measure the permeability stress sensitivity of ultra-low permeability cores. In order to overcome the above difficulties, the present invention provides a cross-correlation technique for measuring the stress sensitivity of ultra-low permeability rock permeability. like figure 1 As shown, the method includes the following steps:

[0022] Step S101: select ultra-low permeability cores su...

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Abstract

The invention provides a mutual correlation technology for measuring permeability stress sensitivity of ultra-low permeability rocks. The technology comprises the following steps: a) an ultra-low permeability rock core of shale or tight sand rock and the like is selected, and processed into a cylindrical sample; b) a cylindrical steel block standard sample is processed for system calibration; c) the measurement of ultra-low permeability is carried out through a periodic oscillation method, the pore medium can employ gas or water, and the measurement result of the steel block is used for calibrating the system; d) the rock core is placed in a clamp holder, and applied with confining pressure and pore pressure, the rock core is saturated, An upstream sine pressure wave is applied and kept constant, the responses of the downstream pressure waves at different confining pressures are measured; e) the downstream pressure waves at different confining pressures are subjected to mutual correlation analysis, the change of permeability with confining pressure is obtained. Combined with a periodic oscillation method for measurement of permeability of ultra-low permeability rocks, pressure waveforms for measurement of permeability are subjected to mutual correlation analysis, the precision of measurement of permeability change is raised, and the problem of measurement of ultra-low permeability stress sensitivity is solved.

Description

technical field [0001] The invention relates to a technology for testing stress sensitivity of ultra-low permeability materials, in particular to a cross-correlation testing technology for ultra-low permeability rock permeability stress sensitivity. The invention can provide technical support for the permeability stress sensitivity test of unconventional oil and gas reservoirs and nuclear waste reservoirs. Background technique [0002] Permeability is the most important physical parameter of reservoir and the basis of oil and gas development. In recent years, with the development of unconventional oil and gas such as shale gas and tight sandstone oil and gas, it is urgent to develop ultra-low permeability (<0.1×10 -3 μm 2 ) testing, which poses challenges to both testing methods and instruments, and is a difficult point in unconventional oil and gas development research. At present, the steady-state method and pulse decay method are mainly used in my country's petroleu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N15/08
Inventor 王小琼葛洪魁申颍浩汪道兵
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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