Effects of Clay Minerals and External Pressures on Imbibition in Shales

Imbibition is an important mechanism of recovery during waterflooding and low flow-back fracking in shale reservoirs. Experiments were carried out to study the development imbibition samples. The effects clay minerals, especially illite IS, mainly investigated discussed. under different pressures was conducted compared. influence minerals on significant complex. It shown that content IS small capillary force lead mass speed. Formation new micro fractures due swelling can cause permeability increase be speeded up. pore structure, affect process significantly. external pressure obviously affects speed final mass. more formation than pressure. There a peak curve displacement efficiency versus either or IS. effect remarkable.