Converter

E - Fixed Constructions – 21 – B

Patent

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Details

E21B 7/18 (2006.01) E21B 21/00 (2006.01)

Patent

CA 2073017

ABSTRACT OF THE DISCLOSURE Pressure converter for mounting above the bore 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. A drive means (2) adapted to be driven by the drilling fluid flow and to move valve means (4) controlling piston means (6) for reciprocating movement with a pressure stroke and a return stroke. Said piston means having at one side a relatively large piston area (11) adapted to be subjected to the drilling fluid pressure in the drill pipe during the pressure stroke, and having at the other side a first, opposite piston area (13) which both during the pressure stroke and the return stroke is subjected to the return pressure in the drilling fluid flow upwards outside the drill pipe, and a second, opposite and relatively small piston area (12) which during the pressure stroke is adapted to generate an increased pressure in a smaller portion of the drilling fluid flow, whereby a check valve (15) provides for discharge of this smaller portion of the flow to a header channel (16) which leads forward to the drill bit, whereas the large piston area (11) during the return stroke is adapted to be subjected to the return pressure outside the drill pipe and the small piston area (12) to the pressure in the drill pipe.

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