SELECTIVE STIMULATION WITH SELECTIVE WATER REDUCTION

摘要

A method for preferentially treating a subterranean formation having at leas t one primarily oil producing layer and at least one primarily water producing layer. The method involves the steps of providing a water shut-off gel into the formation to preferentially treat the water producing layers. This is followed by providing a viscoelastic fluid into the formation, where the viscoelastic fluid is broken by hydrocarbon, thereby remaining and viscosifying primarily in the water producing layers. Finally, a reactive fluid, such as an acid fluid, is provided. The reactive fluid treats primari ly the oil producing layers because the viscoelastic fluid and the water shut-o ff gel prevent the reactive fluid from substantially entering the water produci ng layers.