Conoco Inc.

Terry S Cantu

Donald L Whitfill

Matthew C Sooter

Gerald F Pace

Edwin Kubena, Jr

Mark C Williams

Loss of drilling fluid into a subterranean formation penetrated in the drilling of a well is controlled by addition to the drilling fluid of a lost circulation material comprising petroleum coke.

Method of controlling lost circulation in well drilling

Spontaneous combustion in piles of coal is prevented by forming a slurry of coal fines in an effective amount of sodium silicate solution to form a slurry which is placed on the surface of the coal pile and then allowed to harden into a cement to substantially exclude water and atmosphere.

Coal based cement cover for coal pile

Water content of coal is reduced during heavy liquid/ash separation processes by adding an alcohol containing from 1 to 3 carbon atoms to the heavy liquid. These alcohols are miscible with both the heavy liquid and with the water and provide a continuous phase for water removal.

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Ponca City, OK, United States of America

Terry S Cantu