C - Chemistry – Metallurgy – 09 – K
Patent
C - Chemistry, Metallurgy
09
K
166/16
C09K 8/04 (2006.01) C09K 8/035 (2006.01) E21B 43/22 (2006.01)
Patent
CA 1267075
ENCAPSULATED WATER ABSORBENT POLYMERS AS LOST CIRCULATION ADDITIVES FOR AQUEOUS DRILLING FLUIDS ABSTRACT The disclosed invention is a novel drilling fluid additive for use in reducing lost circulation in wellbores and a method for employing the invention additive for reducing such lost circulation. The invention additive is a highly water absorbent polymer encapsulated by a reaction-preventive protective casing to prevent the polymer from expanding by absorbing water until it is desired to breach the casing. The reaction-preventive protective casing may be a film which will dissolve after a desired time of residence in the borehole or a film or waxy substance which will dissolve or melt at a desired temperature in the borehole, releasing the water absorbent polymer to expand by absorbing water. The substantially expanded polymer will seal off thief zones and fissures, reducing lost circulation.
531982
Smart & Biggar
Texaco Development Corporation
Walker Clarence O.
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