Stratum pressure enhancer fhiber silk, hiber powder like snakes or wors into thesandstone pore or mud page fissure, constantly reduce porosity and fssure area, constantly enhance the formationxessure resistance, when the amount of stratum pressure enhancer into the formation reaches saturation, the pore orissure is completely blocked, the mud leakage will be stopped, the stratum pressure will be greatly enhanced, the specihcgravity of the mud can be increased to The specihc gravity of mud can be increased to 1.50 and no more leakage occurs,so the problems of well caving and upward retum of rock chips will be soled.