Impact drilling tool having a shuttle valve

Details Impact drilling tool having a shuttle valve Impact drilling tool having a shuttle valve

E - Fixed Constructions

21

B

255/13

E21B 27/00 (2006.01) B25D 9/00 (2006.01) E21B 4/14 (2006.01)

Patent

CA 1072537

ABSTRACT OF THE DISCLOSURE An impact drilling tool for rotary drilling which includes a reciprocating hammer inside a casing for striking the top of an anvil. A drilling bit is connected to the opposite end of of anvil for cutting into the earth's formations. The casing is connected in a string of drilling pipe through which a high pressure fluid flows for operating the hammer and removing cuttings. A feeder means extends through the hammer for alternately directing the high pressure fluid above and below the hammer which high pressure fluid causes the reciprocating motion of the hammer. A shuttle valve located around the feeder maintains communication of the high pressure fluid above the hammer for increased effective stroke to insure a harder driving action of the hammer against the anvil. Also the shuttle valve insures a more complete exhaust above the hammer which reduces the force needed to raise the hammer. In alternative embodiments, the shuttle may control only one of the exhaust or pressurization functions.

270698

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