GAS PERMEABILITY ANISOTROPY LABORATORY MEASUREMENT ON WHOLE CORES Russian patent published in 2015 - IPC E21B49/00 

FIELD: oil and gas industry.

SUBSTANCE: method includes core extraction and drying, core analysis by steady-state filtration of gas through it with measurement of coefficients of vertical and horizontal absolute gas permeability and further analysis of the survey results and measurement of absolute gas permeability anisotropy. While determining coefficient of horizontal absolute gas permeability for the core survey is made in six horizontal directions with measurement interval of 30°. Thereafter vertical anisotropy is calculated for six directions as ratio of horizontal absolute gas permeability to vertical one for each direction. Horizontal anisotropy is also calculated as ratio of maximum absolute gas permeability to minimum one on the basis of values determined for six horizontal directions.

EFFECT: improved reliability and accuracy for absolute gas permeability anisotropy on whole cores due to increased number of horizontal gas permeability measurement and improved information content of this method.

3 cl, 3 dwg, 2 tbl