Some Knowledge of Coring Drilling Technology in Large Diameter Deep Hole

Abstract:

Drilling is difficult for coring in large diameter deep hole because of large diameter, complex formation and borehole structure with immature drilling technology. According to the construction of the section of 0～897.66m of hole WFSD-2, the paper introduced the main problems and technical measures in construction. Comparative analysis was made on different construction technologies and technical methods, and some suggestions were put forward to the similar project.

Key words:deep hole; large diameter; coring drilling technology; Wenchuan seismic fracture zone; scientific drilling