Percussion assisted rotary earth bit and method of operating...

Details Percussion assisted rotary earth bit and method of operating... Percussion assisted rotary earth bit and method of operating...

E - Fixed Constructions

21

B

E21B 3/06 (2006.01)

Patent

CA 2701507

A method of boring through a formation includes providing a drilling machine and drill string and operatively coupling an earth bit to the drilling machine through the drill string. An air flow is provided through the drill string at an air pres-sure less than about one-hundred pounds per square inch (100 psi) and an overstrike force is applied to the earth bit, wherein the overstrike force is less than about five foot-pounds per square inch (5 ft-lb/in2).

Procédé de forage à travers une formation, comprenant la fourniture dune machine de forage et un train de tiges de forage et le couplage opérationnel dune foreuse à la machine de forage par lintermédiaire du train de tiges de forage. Un écoulement dair est prévu à travers le train de tiges de forage à une pression dair qui est inférieure à environ cent livres par pouce carré (100 psi) et une force de refrappe est appliquée à la foreuse, la force de refrappe étant inférieure à environ cinq pieds-livres par pouce carré (5 ft-lb/in2).

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