Raytheon Company

Thomas G Pepin

William G Suliga

Michael A Toreno

Benjamin P Dolgin

John T Ishibashi

James A Nalasco

Theodore J Vornbrock, Jr

Aaron Matthew Foulk

Richard Pitre

Mark Olender

Disclosed is a system and method for horizontal directional drilling (HDD). The system and method utilize predictive algorithms to both characterize the soil within the borehole and to quantify instability within the drillstring. The soil characteristics are represented by a soil coefficient (&#x3b1;) which relates the curvature of the borehole with the length of thrust of the drill rig as well as by comparison of thrust while thrusting with torque while drilling. The value of (&#x3b1;) is obtained by comparison of the historical orientation of the drilling head over the length of the borehole and the borehole shape as determined by an arbitrary navigation sensor. Drillstring instability is determined as a function of historical thrust and torque efficiencies and windup over the length of the borehole.

System and method for determining soil characteristics and drilling instability during horizontal directional drilling

Disclosed is a system and method for horizontal directional drilling (HDD). The system and method utilize predictive algorithms to both characterize the soil within the borehole and to quantify instability within the drillstring. The soil characteristics are represented by a soil coefficient (&#x3b1;), which relates the curvature of the borehole with the length of thrust of the drill rig as well as by comparison of thrust while thrusting with torque while drilling. The value of (&#x3b1;) is obtained by comparison of the historical orientation of the drilling head over the length of the borehole and the borehole shape as determined by an arbitrary navigation sensor. Drillstring instability is determined as a function of historical thrust and torque efficiencies and windup over the length of the borehole.

System and method for determining soil characteristics and drillstring instability during horizontal directional drilling

A sensor array system includes a sensor array comprising a first sensor disposed underground and a second sensor disposed underground, and a processor communicatively coupled to the sensors of the sensor array, the processor operative to receive signals from the sensors of the sensor array indicative of seismic activity, and identify a position of a portion of a borehole machine operative to induce the seismic activity while disposed in an underground borehole.

Seismic navigation

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Warrenton, VA, United States of America

Thomas G Pepin