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    • 1. 发明授权
    • Degradable additive for viscoelastic surfactant based fluid systems
    • 用于粘弹性表面活性剂的流体系统的可降解添加剂
    • US07219731B2
    • 2007-05-22
    • US11159023
    • 2005-06-22
    • Philip F. SullivanJ Ernest BrownJesse C. LeeGolchehreh Salamat
    • Philip F. SullivanJ Ernest BrownJesse C. LeeGolchehreh Salamat
    • E21B43/04E21B43/22E21B43/267
    • C09K8/68C09K8/506C09K8/62C09K8/70C09K8/72C09K8/74C09K2208/26C09K2208/30Y10S507/902
    • A method is given for treating a subterranean formation penetrated by a wellbore with a viscosified fluid. The fluid contains a solid hydrolysable polyacid that upon dissolution and hydrolysis releases an acid that is a breaker for the viscosifying system. Suitable solid hydrolysable polyacids include polylactic acid and polyglycolic acid. The fluid also contains a pH control agent, present in an amount sufficient to neutralize any acid present in the solid hydrolysable polyacid before the injection and to neutralize any acid generated by the solid hydrolysable polyacid during the injection, so that the acid breaker is not available to break the fluid during the injection. In one embodiment the viscosifier is a viscoelastic surfactant fluid system and the solid hydrolysable polyacid is of a size selected to be a fluid loss additive, for example in fracturing or gravel packing. In another embodiment, the solid hydrolysable polyacid is used in particles sufficiently small that they enter the pores of the formation. In either case, the viscosifier is broken after the solid releases more acid than can be neutralized by the pH control agent.
    • 给出了用增稠液体处理井眼渗透的地层的方法。 流体包含固体可水解的多酸,其在溶解和水解时释放酸,该酸是用于增粘体系的断裂剂。 合适的固体可水解的多元酸包括聚乳酸和聚乙醇酸。 流体还含有pH控制剂,其量足以中和注射前固体可水解的多元酸中存在的任何酸,并且在注射期间中和由固体可水解的多元酸产生的任何酸,使得酸破乳剂不可用 在注射期间打破流体。 在一个实施方案中,增粘剂是粘弹性表面活性剂流体系统,并且固体可水解的多元酸的尺寸被选择为流体损失添加剂,例如在压裂或砾石包装中。 在另一个实施方案中,固体可水解的多元酸以足够小的颗粒使用,使得它们进入地层的孔。 在任一种情况下,在固体释放比可以被pH控制剂中和的酸更多之后,粘稠剂被破坏。