Calculation method of wall equivalent permeability after natural fracture drilling fluid pollution

The invention discloses a method for calculating equivalent permeability of a wall surface after natural fracture drilling fluid pollution, which comprises the following steps of: firstly, establishing a natural fracture drilling fluid pollution model, dividing grids, and setting permeability, poros...

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Bibliographic Details
Main Authors REN JICHUAN, ZHAO FENG, GUAN CHENCHENG, GOU BO, GUO JIANCHUN
Format Patent
LanguageChinese
English
Published 25.03.2022
Subjects
CALCULATING
COMPUTING
COUNTING
ELECTRIC DIGITAL DATA PROCESSING
PHYSICS
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Summary:The invention discloses a method for calculating equivalent permeability of a wall surface after natural fracture drilling fluid pollution, which comprises the following steps of: firstly, establishing a natural fracture drilling fluid pollution model, dividing grids, and setting permeability, porosity and reservoir pressure parameters according to the actual condition of a reservoir; in consideration of the relative size of the solid-phase particle size of the drilling fluid and the pore throat of the rock, the solid-phase pollution is divided into two processes of forming a mud cake on the wall surface and invading the interior of the rock to block the pore throat to cause pollution, and the influence of the slurry solid-phase pollution on the permeability of the corresponding position is calculated according to different pollution mechanisms. And calculating the grid average permeability of the polluted natural fracture wall surface by combining the mud cake permeability and the matrix permeability, namely
Bibliography:Application Number: CN202111571780