Drilling sub

Details Drilling sub Drilling sub

E - Fixed Constructions

21

B

255/26

E21B 10/60 (2006.01) E21B 21/00 (2006.01) E21B 41/00 (2006.01)

Patent

CA 1166627

Abstract of the Disclosure A drilling apparatus includes a cylindrical housing having an upper end adapted to be connected to a drill string and a power end adapted to be connected to a drill bit. An open cavity is disposed in an outer cyclindrical surface of the housing. A longitudinal passageway is disposed through the housing. A transverse passageway is disposed in the housing and has a first end substantially tangentially intersecting the longitudinal passageway for taking a portion of drilling fluid from the longitudinal passageway. The transverse passageway has a second end com- municated with the open cavity for ejecting that portion of drilling fluid from the second end of the transverse passage- way with a non-radial velocity component in a plane normal to a longitudinal axis of the housing.

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