Encapsulated lime as a lost circulation additive for aqueous...

Details Encapsulated lime as a lost circulation additive for aqueous... Encapsulated lime as a lost circulation additive for aqueous...

C - Chemistry, Metallurgy

09

K

31/8

C09K 8/92 (2006.01) C09K 8/02 (2006.01)

Patent

CA 1261604

ENCAPSULATED LIME AS A LOST CIRCULATION ADDITIVE FOR AQUEOUS DRILLING FLUIDS (D#78,207-F) ABSTRACT OF THE DISCLOSURE 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 lime encapsulated by a reaction-preventive protective casing to prevent the lime from reacting with clays in the borehole 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 lime to react with clays in the formation or in the borehole to form a cement-like mass.

504470

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