Patent ID: 9145736
Filing Date: 2015-09-29
Classification: E21B

Abstract:
1. An apparatus for forming a wellbore in a subterranean formation using a drill string, comprising: a shaft having an end portion, the shaft being configured to be disposed on the drill string; a joint coupled to the end portion, wherein the joint includes a bore for conveying a drilling fluid; a drill bit, the drill bit having a drill bit body and a bit face configured to cut a wellbore bottom, the drill bit tiltably disposed on the joint, wherein the drill bit body includes at least one passage in communication with the bore of the joint, the at least one passage ejecting the drilling fluid at the bit face, wherein the shaft traverses a circumferential gap separating the drill string and the drill bit, and wherein the joint is inside the drill bit and between the circumferential gap and the bit face; and at least one actuator configured to generate a tilting force to tilt the drill bit.