Patent ID: 8297379

Claim:
A drilling sub assembly adapted to be coupled between a drill bit of a drilling rig and a drill pipe, the drilling sub assembly comprising: a body casing having a first end, a second end and an internal lumen, the first end being threadedly couplable to the drill pipe, and the internal lumen rotatably receiving (i) a baffle having an upper chamber and a lower chamber and (ii) a turbine unit, wherein the turbine unit comprises a complimentary surface that is received by and terminates in the baffle's lower chamber; a bearing housing having a first end threadedly coupled to the second end of the body casing, the first end further having a recess to receive a first bearing unit, the first bearing unit being interposedly positioned between the turbine unit and the recess, a second end of the bearing housing having a recess to receive a second bearing unit; and a mandrel having a base and a shaft, the shaft extending outwardly from the base, the shaft being rotatably inserted through the bearing housing to threadedly couple with the turbine unit, the second bearing unit being interposedly positioned between the base and the recess of the second end of the bearing housing, a portion of the base being threadedly coupled to the drill bit, wherein a fluid pathway is provided through the drilling sub assembly such that flow of a drilling fluid though the fluid pathway activates the turbine unit to cause activation of the drill bit.