Development and Application of Wire-line Coring Bit for Hard and Compact Rock Formation

Abstract:

Optimized design and tests were made on bit matrix formula, diamond parameters and bit nozzle to overcome slow drilling footage and short service life of the wire-line coring bit in hard and compact rock formation, the newly developed bit (S77), with good adaptability, overcame the drilling “sliding” in extra-hard to hard and mid to weak-abrasive rock formations.