Carbon dioxide foamed fluids

二氧化碳发泡流体

Abstract

An aqueous viscoelastic surfactant (VES) fluid foamed or energized with carbon dioxide, in which the VES is more compatible with the carbon dioxide, is made by the addition of one or more than one synergistic co-surfactant. The synergist co-surfactant includes quaternary amines and ethoxylated carboxylates having a hydrophobic chain shorter than the hydrophobic chain of the VES. Improved compatibility is evidenced for a given surfactant concentration either by formation and maintenance of a foam under conditions at which the foam could not otherwise have been formed or maintained, or by either higher viscosity of the foamed fluid at a given temperature or longer foam life at a given temperature or a higher temperature at which useful fluid viscosity can be generated or maintained for a useful time. The aqueous carbon dioxide foamed fluids may be used in acidizing, acid fracturing, gravel packing, diversion, and well cleanout.
通过添加一种或多于一种的增效辅助表面活性剂,来制备含水粘弹性表面活性剂(VES)流体,用二氧化碳使其发泡或赋能,在该流体内VES和二氧化碳能更好的相容。增效辅助表面活性剂包括季铵盐和乙氧基化羧酸盐,其具有疏水链且该疏水链短于VES的疏水链。对于给定的表面活性剂浓度,通过在其它方式不能产生并维持泡沫的条件下,能形成并维持泡沫,或通过给定温度下泡沫粘度更高,或给定温度下泡沫寿命更长,或在更高的温度下能产生并维持一段可用时间的流体粘度,以此来证明其能提高相容性。含水二氧化碳发泡流体可以用于酸化、酸压裂、砂砾填充、导流和清洗。

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Patent Citations (3)

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