| 摘要 |
PCT No. PCT/WO91/00135 Sec. 371 Date Oct. 27, 1993 Sec. 102(e) Date Oct. 27, 1993 PCT Filed Nov. 4, 1991 PCT Pub. No. WO92/08872 PCT Pub. Date May 29, 1992.Converter group comprising at least two pressure converters adapted to be mounted in a row axially above the drill bit at the lower end of a drill pipe for deep drilling, in particular for oil and gas, and for generating an increased fluid pressure utilizing energy in a drilling fluid flow down through the drill pipe, so as to obtain an enhanced drilling effect, preferably by means of one or more high pressure jets adapted to have a cutting action in a surrounding rock formation. Pressure converters (20A, 20B) have axially abutting end faces (22A, 22B) of spherical shape. Attachment means for axial interconnection of the pressure converters are resilient or flexible so as to make possible a certain, small freedom of angular movement between the axes of the pressure converters.
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