Apparatus for signalling within a borehole while drilling

Details Apparatus for signalling within a borehole while drilling Apparatus for signalling within a borehole while drilling

E - Fixed Constructions

21

B

166/4

E21B 49/00 (2006.01) E21B 47/18 (2006.01)

Patent

CA 1221025

S P E C I F I C A T I O N "Improvements in or Relating to Apparatus for Signalling within a Borehole while Drilling" ABSTRACT OF THE DISCLOSURE A down-hole signal generator for a mud-pulse telemetry system comprises an annular impeller surroun- ding a casing and arranged to be driven by the mud passing along the drill string. The impeller serves to drive a torque control arrangement, and preferably also an electrical generator, within the casing. The torque control arrangement is switchable between two states by a signalling actuator in response to an electrical input signal. In a first state the impeller may be driven relatively easily so that it is rotated at a relatively fast speed by the mud flow, whereas, in a second state, a greater torque is required to drive the impeller so that it is rotated at a relatively slow speed. Thus suitable variation of the input signal may be used to vary the impeller speed to transmit a modulated pressure signal in the mud flow which may be sensed at the surface.

467707

Affiliated with

Also associated with

Rating

Apparatus for signalling within a borehole while drilling does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Apparatus for signalling within a borehole while drilling, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Apparatus for signalling within a borehole while drilling will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFCA-PAI-O-1205179