Pressure converter

Details Pressure converter Pressure converter

E - Fixed Constructions

21

B

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

Patent

CA 2096434

ABSTRACT OF THE DISCLOSURE Pressure converter for mounting above the drill bit at the lower end of a drill pipe for deep drilling, comprising drive means adapted to be driven by the drilling fluid flow and to move valve means controlling piston means for reciprocating movement with a pressure stroke and a return stroke. Said valve means has the form of a rotatable valve body the axis of rotation of which is parallel to or coincident with the axis of the piston means, and which is arranged in a top cover above the space in front of the large piston area. The valve body has a diametrical through passage and a central opening from the passage into the piston space. The top cover has inlets and outlets respectively, being pairwise diametrically opposed and adapted to communicate with the passage in different angular positions of the valve body.

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