Coring Drilling Technology in Wenchuan Earthquake Fault Scientific Drilling Project

Abstract:

Wenchuan earthquake's Fracture Scientific Drilling (WFSD) was carrying out in the serious broken formation, one of the purposes is obtaining original cores to meet the geosciences requirements. Technologies of isolated fluid coring drilling, polycrystalline diamond compact (PDC) with sharp teeth and low drilling weight coring drilling, bottom hole power coring drilling and split barrel undamaged coring were applied in WFSD-2 and WFSD-3. The results indicated that the rate of drilling speed and roundtrip footage were improved in the serious broken formation. What's even more important was that the high-quality original cores had been obtained by these improved drilling technologies.