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Mud cake simulation shale microcracks


Huang Jinjun, Chen Xinwei*, Xu Ying, Li Ran, Li Chunxia
Page No. 13-19


Abstract

Exploration ultra-low permeability mud cake production conditions, using ultra-low permeability
mud cake to simulate shale microcracks. Studied the dispersion conditions on permeability of the
filter cake,such as bentonite, temperature, stirring speed, stirring time and drilling fluid
additions,obtained the variation of the cake permeability,found the closest mud cake production
conditions to shale permeability. As can be seen from the experimental data,the permeability of
mud cake decreased with the increase of bentonite, stirring speed ,stirring time. Effect of
temperature on the permeability of the filter cake is reduced after the first increase, the critical
temperature is 20 ℃. Join drilling fluid can significantly reduce the cake permeability. The results
show that under the experimental conditions of mud cake permeability between 0.1986 × 10-6
μm2 ~5.7904 × 10-6 μm2, show mud cake permeability shale can reach nearly shale level.
Key words: Mud cake; Shale; Permeability; Microcracks


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