Abstract: A cartridge for a drill bit of a rotary directional drilling system, the cartridge comprising: a cartridge housing having an inlet end for receiving drilling fluid from a drill string and an outlet end at which drilling fluid can exit the cartridge housing; a flow diverter configured to selectively control the flow direction of drilling fluid as the drilling fluid exits the cartridge housing; and a bearing assembly for supporting the flow diverter; wherein the bearing assembly comprises at least one bearing located at the outlet end of the cartridge housing.

Abstract: A directional drilling assembly includes a downhole piston and an uphole piston. A downhole piston diameter of the downhole piston is smaller than an uphole piston diameter of the uphole piston diameter. This may allow the downhole piston and/or the uphole piston to be located closer to the bit, thereby improving the maximum DLS of the system.

Abstract: A drilling apparatus connectable with a drill pipe and connectable with a drilling assembly comprising a drilling assembly housing, for use in drilling a borehole, including a rotation restraining device actuatable between a retracted position and an extended position, a rotation restraining device actuator for actuating the rotation restraining device between the retracted position and the extended position, a swivel actuatable between a locked position and an unlocked position, and a swivel actuator for actuating the swivel between the locked position and the unlocked position. A method for drilling a borehole, including connecting a drilling assembly with a drill pipe, wherein the drilling assembly comprises a drilling assembly housing, drilling while rotating the drill pipe and thereby rotating the drilling assembly housing, and drilling while rotating the drill pipe relative to the drilling assembly housing.

Abstract: This invention relates to a stabilizer (10) for a steerable drilling system, in particular for use in drilling directional boreholes for oil and gas extraction. There is provided a stabilizer (10) for a steerable drilling system having a first passageway (16) and a second passageway (18) at its outer surface, the passageways being helical and extending along the length of the stabilizer, the first and second passageways being oppositely-oriented, the first and second passageways intersecting one another, the stabilizer having a number of blades (22) between the passageways, the cross-sectional area of the first passageway being larger than the cross-sectional area of the second passageway. The asymmetric passageways enable the stabilizer designer to enhance the performance of the stabilizer during drilling and tripping.

Abstract: This invention relates to a stabilizer (10) for a steerable drilling system, in particular for use in drilling directional boreholes for oil and gas extraction. There is provided a stabilizer (10) for a steerable drilling system having a first passageway (16) and a second passageway (18) at its outer surface, the passageways being helical and extending along the length of the stabilizer, the first and second passageways being oppositely-oriented, the first and second passageways intersecting one another, the stabilizer having a number of blades (22) between the passageways, the cross-sectional area of the first passageway being larger than the cross-sectional area of the second passageway. The asymmetric passageways enable the stabilizer designer to enhance the performance of the stabilizer during drilling and tripping.