FIELD: chemistry.
SUBSTANCE: method of repairing a borehole involves placing the service borehole fluid containing a set of surfactants which includes a cationic surfactant and an anionic surfactant in the borehole. Upon coming into contact with an aqueous solution at temperature from about 10°C to about 200°C, the set of surfactants forms a thickened composition substantially without hydrotropes. The substantial absence of hydrotropes means presence of less than about 0.1 wt % hydrotrope per total weight of the set of surfactants in the borehole.
EFFECT: high efficiency of sealing circulation loss zones.
23 cl, 13 dwg
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