发明授权
US3960736A Self-breaking viscous aqueous solutions and the use thereof in fracturing subterranean formations 失效
断裂粘性水溶液及其在压裂地下地层中的应用

Self-breaking viscous aqueous solutions and the use thereof in
fracturing subterranean formations
摘要:
Viscous aqueous solutions are prepared which maintain a certain viscosity range over a predetermined period of time (i.e., induction period) and which thereafter break, i.e., decrease in viscosity over a very short period of time. The viscous aqueous solution comprises a polysaccharide having an ability to thicken water and dispersed or dissolved in the aqueous solution an effective quantity of an organic ester which, at a temperature at which it is desired to break the viscous solution, hydrolyzes over a delayed period of time to form an acid which degrades the polysaccharide, thus causing a splitting of the polysaccharide chain and a decrease in the viscosity of the solution.
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