Sandy uppershelf sandy sediment core collection method.A) air hammer, B) weighted base c) preparing core for removal, d) core raised and en route to boat, e) airbag being retrieved prior to raising the sediment core which is attached...
Structure design of and numerical simulation on an annular reverse circulation drill bit... The reverse circulation drilling technology of hollow through DTH air hammer is a set of efficient coring with DTH air hammer, full-hole reverse circulation with drilling fluids, and continuous coring without power lack....
Experimental study on bit tooth made of nano-cemented carbide composites in air hammer drilling... It is fracture, wear and abscission of bit tooth that make up of the main failure forms for the air hammer bit, which have badly restricted the further popularization and application of the air hammer drilling....
Development of air hammer with self-propelled round bit and the contact analysis of the key components... Within the vertical section, ROP of the conventional air hammer in gas drilling is several times or even several dozen times than that of underbalanced drilling....
