| 摘要 |
PCT No. PCT/NO95/00178 Sec. 371 Date Apr. 11, 1997 Sec. 102(e) Date Apr. 11, 1997 PCT Filed Oct. 4, 1995 PCT Pub. No. WO96/12082 PCT Pub. Date Apr. 25, 1996Pressure amplifier for mounting above the drill bit at the lower end of a drill pipe for generating an increased fluid pressure in a drilling fluid flow, for example for obtaining an increased drilling effect. A reciprocating piston in a cylinder is designed with a large piston area at one end (low pressure side), a relatively small piston area at the opposite end (high pressure side), and an annular surface formed at the transition between the two ends. The pressure converter also includes a control valve, an actuator, and a drilling fluid valve to control drilling fluid flow to and from the cylinder.
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