Conoco Inc.

Larry D Taylor

Jeffrey L Beck

Pramod C Thakur

David M Miller

A drilling method and apparatus for directional drilling of a borehole. The apparatus includes a retrievably mounted downhole monitor for sensing parameters of the drill rod to which a drill bit is attached. A bent-sub is connected with said drill rod behind the drill bit to position the drill bit to extend angularly with respect to the drill rod. An actuator such as a hydraulic ram is provided for exerting thrust along the axis of the drill rod on said drill bit. The drill rod and drill bit is not rotated with the use of a downhole motor. Based upon the signals received from the downhole monitor, the drill rod and bit are pulsed to effect the desired trajectory of the drilling.

Rotary drillstring guidance by feedrate oscillation

Respirable dust particles in air are reduced by spraying with water from high pressure spray nozzles. The removal of particles in the size range most likely to cause pathological damage is enhanced by addition of a surfactant to the spray water.

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Morgantown, WV, United States of America

Larry D Taylor