Borehole logging apparatus for deep well drilling

Details Borehole logging apparatus for deep well drilling Borehole logging apparatus for deep well drilling

E - Fixed Constructions

21

B

E21B 47/12 (2006.01) E21B 47/18 (2006.01)

Patent

CA 2370987

The invention is directed to a borehole logging apparatus for deep well drilling, with a signal transmitter for transmitting measured data obtained while drilling from a borehole through the drilling fluid to the earth's surface, and with an elongated housing which is adapted for insertion in the drilling fluid conduit of a drill string. Accommodated in the housing is a flow regulator with a control piston, which controls the cross-section of opening of a bypass opening in response to the pressure differential generated by a flow restrictor and in response to the force of a spring in such manner that the part of the drilling fluid current fed to the signal transmitter through the flow restrictor is maintained substantially constant, and the remaining excess drilling fluid current is routed to the drilling fluid conduit via the bypass opening.

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