Signalling within a borehole while drilling

Details Signalling within a borehole while drilling Signalling within a borehole while drilling

G - Physics

01

V

349/5

G01V 1/40 (2006.01) E21B 41/00 (2006.01) E21B 47/12 (2006.01) E21B 47/18 (2006.01)

Patent

CA 1165853

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 a flow constrictor defining a throttle orifice for the mud passing along a drill string, a throttling member displaceable with respect to a casing to modulate the mud pressure for the purpose of transmitting measurement data up the drill string, and a turbogenerator incorporating an electrical generator within the casing. The flow constrictor and casing form an integrated unit which is installed within a drill collar and is retrievable by drawing it up the inside of the drill string. The throttling member is displaced by a pump according to the torque required to drive the rotor of the generator which is dependent on the electrical load of the generator. The pump incorporates a rotary valve member which supplies the output of the pump to one or other side of a double- acting ram according as to whether the valve member is rotating with a first phase of rotation or a second phase of rotation. The phase of rotation is determined by a torque sensitive actuator coupled to the valve member by a shaft and incorporating an escapement plate tiltable about an axis transverse to the shaft by a torque drive arm for driving the rotor.

384617

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