Compositions – Leather or fur treating
Patent
1985-05-28
1987-05-12
Guynn, Herbert B.
Compositions
Leather or fur treating
252 851, 175 72, C09K 702
Patent
active
046648160
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.
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Delhommer Harold J.
Guynn Herbert B.
Park Jack H.
Priem Kenneth R.
Texaco Inc.
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