| abstract |
PURPOSE: To inhibit lowering in the rheological characteristics of a fracturing fluid under high temp. conditions, by adding a specified compd. to a fracturing fluid contg. guar gum (derivative). n CONSTITUTION: 0.001W0.1pt.wt. 2-mercaptobenzimidazole compd. or 2- mercaptobenzothiazole compd. of formula I or II (wherein R 1 WR 4 are each H, lower alkyl; X is H, alkali metal, ammonium) is added to 100pts.wt. fractur ing fluid contg. 0.01W30wt% guar gum (derivative) and optionally thickener, hydrocarbon, methanol, crosslinking agent, surfactant, pH adjustor, etc. n COPYRIGHT: (C)1986,JPO&Japio |