Shale gas apparent permeability calculation method considering influence of multiple factors

A calculation method, shale gas technology, applied in calculation, computer parts, earthwork drilling and production, etc.
CN110210460APending Publication Date: 2019-09-06CHINA UNIV OF PETROLEUM (EAST CHINA)
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
CHINA UNIV OF PETROLEUM (EAST CHINA)
Publication Date
2019-09-06

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Abstract

The invention relates to a shale gas apparent permeability calculation method considering multi-factor influence, which comprises the following steps: (1) reconstructing a shale three-dimensional digital core based on a shale two-dimensional profile scanning electron microscope image by adopting a multi-point geostatistics method; (2) calculating the porosity, tortuosity and porous medium characteristic length of the shale three-dimensional digital rock core; and (3) calculating the gas permeability in the organic matter and inorganic matter of the shale. According to the method, the influenceof the pore structure, different pore types (organic matter pores and inorganic matter pores), adsorption and desorption, surface diffusion, gas slippage, stress sensitivity and critical property change in the shale gas reservoir on the gas flow capacity is fully considered, and the shale gas flow capacity under the conditions of different pore structures and gas reservoirs can be accurately predicted.
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Description

technical field

[0001] The invention relates to a method for calculating the apparent permeability of shale gas considering the influence of multiple factors, and belongs to the technical field of unconventional oil and gas development. Background technique

[0002] Gas flow capacity in shale micro-nano channels is currently a research hotspot in the field of unconventional oil and gas. Adsorbed gas and free gas coexist in shale pores. The mass transport of gas in shale has the following mechanisms: viscous flow, Knudsen diffusion, and surface diffusion. Collisions between molecules of the same gas produce viscous flow, collisions between molecules and walls produce Knudsen diffusion, and gas molecules adsorbed on pore walls wriggle along the pore surface to produce surface diffusion. Since the continuity assumption is not applicable in micro-nano pores, the Knudsen number, which is the ratio of the free path of gas molecule movement to the pore radius, is generally used t...

Claims

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