E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
E21B 4/06 (2006.01) E21B 4/02 (2006.01)
Patent
CA 2046899
2046899 9110067 PCTABS00006 A progressive cavity drilling apparatus which includes a drill bit (26), a drill bit driving shaft (16) have a hollow bore (25) formed therein and a progressive cavity drive train (A) for driving the drilling shaft (16). A flow restrictor (42) is provided to cause fluid leaving the progressive cavity drive train to enter the interior of the hollow drilling shaft and then to be exited therefrom through nozzles formed in the drill bit. The flow restrictor includes a groove (44) to allow a small amount of fluid to flow in a path winding around the circumference of the flow restrictor (42) and into a bearing assembly (30) located below the flow restrictor (42). Because the flow path winds around the circumference of the flow restrictor, it is significantly longer than a straight longitudinal flow path. Consequently, the velocity of the high pressure fluid through the flow path is significantly reduced thus minimizing erosion and wear of the flow restrictor. The flow restrictor may also function as a radial support which can obviate the need for a separate radial bearing. The radial support may be provided between the helical grooves or in a separate portion of the flow restrictor. The flow restrictor can also have an inner diameter which is eccentrically moveable with respect to the outer diameter of the flow restrictor so as to accomodate shaft movement.
Ide Russell D.
Swabey Ogilvy Renault
LandOfFree
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