Calculation of safe drilling mud density window for shale formation by considering chemo-poro-mechanical coupling effect

ZHANG Shifeng,WANG Haige,QIU Zhengsong,CAO Wenke,HUANG Hongchun,CHEN Zhixue

Fig. 10. Influence of permeability, shale hydration swelling coefficient, strength damage coefficient and residual hydration swelling pressure of sealing layer on shale borehole wall collapse pressure and fracturing pressure.