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A Calculation Method of Shale Apparent Permeability Considering Stress Sensitivity Effect

A calculation method and permeability technology, which is applied in the field of shale apparent permeability calculation considering the stress-sensitive effect, can solve problems such as the difficulty of studying the seepage mechanism of shale gas

Active Publication Date: 2020-05-15
SOUTHWEST PETROLEUM UNIV
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Problems solved by technology

In the process of shale gas development, the migration of shale gas is not only affected by the dynamic changes of the occurrence pores, but also by the changes of temperature and pressure, which brings great difficulties to the study of the seepage mechanism of shale gas.

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  • A Calculation Method of Shale Apparent Permeability Considering Stress Sensitivity Effect
  • A Calculation Method of Shale Apparent Permeability Considering Stress Sensitivity Effect
  • A Calculation Method of Shale Apparent Permeability Considering Stress Sensitivity Effect

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Embodiment Construction

[0044] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be described in further detail below in conjunction with the embodiments and 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.

[0045] Shale reservoirs have very low permeability, and organic pores and inorganic pores are the main components of shale matrix pores (Kang S M, Fathi. Carbon dioxide storage capacity of organic richshales[J]. SPEJ, 2013, 16(4 ):842-855.). However, the mineral compositions of organic matter and inorganic matter are different, and their pore sizes are also different, with significant differences. It is difficult to use traditional Euclidean geometry principles to conduct quantitative research on shale matrix. Therefore, the present invention uses the fractal theory to accurately characterize ...

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Abstract

The invention discloses a shale apparent permeability calculation method considering a stress sensitive effect. The method includes the steps of dividing a shale gas flow channel into an inorganic capillary tube and an organic capillary tube, and establishing inorganic pore and organic pore calculation models; considering the different flow mechanism of shale gas in capillary tubes of inorganic matter and organic matter, establishing the apparent permeability calculation models of inorganic matter and organic matter by a fractal theory. Furthermore, the area weighted method is used to calculate the apparent permeability considering the influence of water saturation and stress sensitive effect in shale mining, and the calculation method of apparent permeability is established. Through the improvement, the method establishes a calculation model which is more consistent with the apparent permeability of shale, and provides theoretical support for shale gas production.

Description

technical field [0001] The invention relates to the field of shale gas exploration and development, in particular to a method for calculating the apparent permeability of shale in consideration of stress sensitivity effects. Background technique [0002] Shale gas is a kind of unconventional natural gas, which has multiple occurrence modes (including free, adsorbed and dissolved natural gas), multiple migration modes (including desorption, diffusion, slippage and seepage, etc.), spanning multiple scales (including nanopores, micropores, etc.). In the process of shale gas development, the migration of shale gas is not only affected by the dynamic changes of the occurrence pores, but also by the changes of temperature and pressure, which brings great difficulties to the study of the seepage mechanism of shale gas. The apparent permeability of shale, as a characteristic parameter that can characterize the above-mentioned comprehensive effects, has attracted great attention fro...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F119/14
CPCG06F30/20
Inventor 曾凡辉文超郭建春王小魏王超
Owner SOUTHWEST PETROLEUM UNIV
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