Multi-field coupling permeability calculating method considering shale matrix difference

A calculation method and technology of permeability, which is applied in the field of calculation of shale permeability to avoid calculation errors

Active Publication Date: 2018-06-29
RES INST OF SHAANXI YANCHANG PETROLEUM GRP
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Problems solved by technology

However, in shale, free gas directly contacts with adsorbed gas. Since adsorbed gas has a certain transmission speed (the transmission speed is not 0), the transmission speed of free gas at the contact surface is not 0. Therefore, the transmission of adsorbed gas has a great impact on shale organic matter. Permeability has a certain impact, which is not considered in the above-mentioned technical solutions

Method used

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  • Multi-field coupling permeability calculating method considering shale matrix difference
  • Multi-field coupling permeability calculating method considering shale matrix difference
  • Multi-field coupling permeability calculating method considering shale matrix difference

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Experimental program
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Embodiment Construction

[0068] 1. Establishment of calculation model for organic matter permeability

[0069] There are free gas and adsorbed gas in the pores of organic matter, but the transmission modes of the two are very different. Adsorbed gas will have a certain impact on the pore size, porosity and free gas transmission of organic matter, so it will affect the permeability of organic matter. In the micro-nano-level pore size, gas diffusion will also have a certain impact on the permeability of organic matter.

[0070] Under the control of the micro-nano-scale pore structure, free gas is mainly transported through viscous flow and diffusion flow under the action of pressure or concentration difference.

[0071] 1) Viscous streaming

[0072] Suppose the gas has a radius of r Viscous laminar flow transport in a capillary with any radius The transmission speed at

[0073] (26)

[0074] In the formula, v is the gas transmission speed, m / s; r is the capillary radius, m; p in is the pres...

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Abstract

The invention relates to a calculating method of shale permeability. The multi-field coupling permeability calculating method considering the shale matrix difference is characterized in that the permeability is shown in the description. On the basis of the prior art, the influence of the mutual effect of adsorbed gas and free gas on the shale permeability is further considered, and the influence of the thickness of water membranes on the shale permeability is considered. The influences of the mutual effect of the adsorbed gas and the free gas, the influence of the thickness of the water membranes, and the influence of the viscous flow, diffusion, the adsorbing layer gas thickness, the matrix shrinkage and the stress sensitivity are all coupled into a shale permeability calculating model. The influence of multiple features of shale on the permeability can be more comprehensively represented. Based on respective features of organic matter and inorganic matter of shale, an organic matterpermeability calculating model and an inorganic matter permeability calculating model are built respectively. The calculating error caused by the matrix difference can be effectively avoided.

Description

technical field [0001] The invention relates to a calculation method of shale permeability. Background technique [0002] Shale permeability is a key parameter to guide shale gas productivity evaluation and shale gas development. There are generally experimental methods and calculation methods to obtain shale permeability. The experimental method can obtain relatively accurate results, but the cost is too high. At present, there are endless calculation methods for shale permeability. For example, the calculation method of shale matrix permeability proposed by Mi Lidong corrects the slippage coefficient, which represents slippage and free gas diffusion. Shale permeability calculation model of joint influence. Wang Rui characterized the effect of the adsorption layer on the shale pore size, and established a shale permeability calculation model considering the effects of adsorption, slippage and diffusion. Cao Cheng proposed a shale permeability calculation model considering...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
CPCG06F30/20G06F2119/06
Inventor 曹成张丽霞赵谦平姜呈馥刘刚高潮高栋臣孙建博尹锦涛史鹏王晖祁攀文
Owner RES INST OF SHAANXI YANCHANG PETROLEUM GRP
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