鑽粒鑽进所固有的一个缺点,是这种鑽进方法易使鑽孔发生弯曲。因而在鑽进中,常常由于鑽孔发生过大的弯曲而增加了事故,为升降操作......

Rapid capacity expansion in 2007 There were nearly 10 glyoxal producers in China in 2007 with a total capacity of aroun......

Being an independent movie producer and making a documentary could sound very thrilling and romantic, but when Yang Yue......

超深水平井在施工中存在尾管串下入易遇阻、水平段固井质量难以保证2大技术难题。旋转尾管固井技术解决了尾管下入和固井期间尾管......