Poroelastic modeling of cutting bottom-hole rock – Part I: Stress state of bottom-hole rock

This is the first part of a series of two papers modeling cutting bottom-hole rock during drilling. This paper studies the stress state of a bottom-hole rock that a downhole bit is drilling. A bottom-hole rock underground is subjected to far field in-situ stresses. During drilling process, the rock materials above the bottom-hole rock are gradually removed and replaced with drilling fluid, thus altering the stress state of the bottom-hole rock.