Several gas injection tests were performed in-situ through packed off sections of two boreholes in order to study the migration of gas phase in an indurated clay rock: the Callovo-Oxfordian (COx) claystone of the Paris basin, France. Different gas injection tests (nitrogen) have been performed at various flow rates from ~1 mLn/min to ~500 mLn/min. The data analysis and a two-phase flow modelling revealed that gas percolates first in the borehole damaged zone but that a small quantity of gas migrates through the intact host rock. This in-situ test confirmed that gas entry pressure in COx claystone is over 4 MPa.

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