Underwater baseplate installation in advance is needed for semi-submersible platform pre-drilling well.
平台预钻井，需要预先安装水下基盘。
2
Only through accurate pre-drilling pressure prediction and carefully geologic study, the drilling safety can be assured.
只有准确地搞好钻前压力预测，搞好油气地质研究，才能确保钻井的安全。
3
The idea of genetic types of reef petroliferous system have played an important role in pre-drilling appraisal of hydrocarbon potential for reef reservoir.