Patent ID: 8225884
Filing Date: 2012-07-24
Classification: E21B

Abstract:
1. A down hole well bore apparatus to underream and remove rock or cement or other material, cut or mill casing, clean or scrape casing, or centralize a drill string, comprising: (a) two threaded connection flanges whereby said apparatus is connected to a drill string and wherein a main fluid bore runs through the center of said flanges whereby drilling fluid is pumped through, and (b) one or more stator turbines located inside said flanges, and (c) one or more stator retention pins which hold said stator turbines in a stationary position relative to said flange, and (d) one or more cylindrical plates located between said flanges, and (e) at least one rotatable rotor located within said cylindrical plates, and (f) one or more rotor turbines located within said rotor, and (g) one or more rotor retention pins which hold said rotor turbines in a stationary position relative to said rotor, and (h) one or more rotor springs and rotor bolts which connect said rotor to at least one said cylindrical plate, and (i) one or more rotatable blades located between said cylindrical plates and flanges and adjacent to said rotor, and (j) one or more blade flange bolts, washers and nuts, which run through and hold together said flanges, said plates, and said blades, and which also provide a bearing axis means upon which the blades may rotate to an open and closed position, and (k) one or more blade sleeves which are located in the bores running longitudinally through said blades of which said blade flange bolts run through said sleeves and of which the sleeves are slightly longer in height than the blades which allow said plates and said flanges to be held together yet allow the blades to freely rotate, and (l) one or more wirelines and tension springs which connect said blades to said rotor whereby when fluid is pumped through said rotor turbine and the rotor said fluid imparts a partial revolution of the rotor which actuates the blades to an open position until the blades abut a stop cylinder pin whereby when fluid is not pumped the rotor returns to its original position whereby the blades also return to their original closed position.