1)stray sand,钻井中不期而遇的砂层2)Run into; Bumped into,偶然遇见;无意中发现;不期而遇3)To meet without previous arrangement,不约而遇4)drilling strata,钻遇地层5)drilling ratio of sandbody,砂体钻遇率6)The Unexpected Redemption,不期而至的救赎
用法例句
Using logging data to evaluate the drilling strata compositely;
