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    • 9. 发明授权
    • Process comprising a reversible forming composition
    • 方法包括可逆形成组合物
    • US06286601B1
    • 2001-09-11
    • US09467216
    • 1999-12-20
    • Jean-François ArgillierPhilippe Roche
    • Jean-François ArgillierPhilippe Roche
    • E21B2114
    • C09K8/94C09K8/38C09K8/703Y10S507/925
    • A process for circulating an aqueous foam in a wellbore includes the steps of forming a foam from an aqueous composition having a determined pH value, injecting the foam into a well so that it circulates from the surface to the well bottom and then back from the well bottom to the surface, and then changing the pH value of the foam when it returns to the surface. The aqueous composition from which the foam is made includes at least one ionic surfactant whose charge does not practically depend on the pH value and a polyampholytic polymer whose global charge depends on the pH value. This composition gives the foam the property that when the pH of the foam is varied at the surface of the well, the charge of the polyampholytic polymer is modified and the foam becomes destabilized and breaks more readily.
    • 在井孔中循环含水泡沫的方法包括以下步骤:从具有确定的pH值的水性组合物形成泡沫,将泡沫注入井中,使其从表面循环到井底,然后从井中回流 底部到表面,然后当其返回到表面时改变泡沫的pH值。 制成泡沫的含水组合物包括至少一种离子表面活性剂,其电荷实际上不依赖于pH值,并且其全球电荷取决于pH值的聚阴离子聚合物。 该组合物赋予泡沫的性质,当泡沫的pH在孔的表面变化时,聚合溶剂聚合物的电荷被改变并且泡沫变得不稳定并且更容易断裂。