A.鉆井液池體積增加 B.泵沖數(shù)減小 C.泵壓下降 D.流速增加
A.1/3~2/3 B.1/4~1/5 C.1/2~1/3 D.1/5
A.3~4柱鉆桿或1柱鉆鋌 B.3~5柱鉆桿或1柱鉆鋌 C.3~5柱鉆桿或12柱鉆鋌 D.2~5柱鉆桿或1柱鉆鋌