Method and apparatus for driving pipe

Details Method and apparatus for driving pipe Method and apparatus for driving pipe

E - Fixed Constructions

02

D

255/8, 61/85

E02D 7/28 (2006.01) E21B 1/02 (2006.01) E21B 6/00 (2006.01) E21B 7/20 (2006.01) E21B 43/10 (2006.01)

Patent

CA 1097330

ABSTRACT OF THE DISCLOSURE A casing hammer for driving casing while drilling a water well comprises a housing having an annular pneumatic chamber with a relatively lightweight, short-stroke annular piston. The piston is reciprocably driven at a high rate to provide a large number of light blows of control- lable energy upon an annular anvil that seals one end of the chamber. Per- cussive blows upon the anvil are transmitted through a dive head and adapter to the upper end of the pipe to be driven. The hammer is suspended from a rotary drive head that operates a hollow drill string extending downwardly through the hammer and through the casing driven thereby.

323806

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