A.高于地层破裂压力的泵压 B.低于地层破裂压力,高于地层静压的的泵压 C.低于地层静压的泵压 D.低于地层流动压力的泵压
A.80%~90% B.65%~80% C.55%~65% D.50%~55%
A.20 B.30 C.49 D.80