Casing assembly for a down-the-hole drill tool

Details Casing assembly for a down-the-hole drill tool Casing assembly for a down-the-hole drill tool

E - Fixed Constructions

21

B

E21B 4/06 (2006.01) E21B 4/14 (2006.01) E21B 17/10 (2006.01)

Patent

CA 2097307

2097307 9209782 PCTABS00013 A percussion drill includes a reciprocating piston surrounded by a cylindrical casing. Disposed at opposite ends of the cylindrical casing are replaceable hollow cylindrical wear sleeves. The wear sleeves are mounted within recesses formed in the outer surface of the casing. Each wear sleeve has a thickness equal to the depth of its respective recess. A longitudinal inner end of each wear sleeve is spaced longitudinally from an end surface of the recess, and a flexible seal is situated between those opposing ends. The wear sleeves can be replaced after being worn by the abrasive environment encountered in the hole being drilled. The wear sleeves may be formed of a more wear resistant material than the casing.

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