...) and breaking area, the penetration and rock-breaking area of the chord-edge cutter are studied, which clarifies that the rock-breaking efficiency of the chord-edge cutter is higher than that of the conventional cutter. The first part of the laboratory experiment investigated the drilling efficiency of two mini...

... the dynamic motion of the bottomhole assembly (BHA) from that of the bit, thus providing a dynamically more stable bit. The paper describes the details of a prototype 8½-in. flexible bit design, laboratory experiments, and field tests, which verify the concept. 1 11 1995 23 10 1997 17 4 1998...

... with water-based muds (WBM) to determine S orw and S orm 8 , or propose a correction to conventional core-oil saturations (based on laboratory experiments), to account for surfacing effects. 9 Recently, several papers discuss using pressure coring to measure coalbed gas volumes to better define...