Well cementation composite plugging spacer fluid system and application thereof

The invention relates to a well cementation composite plugging spacer fluid system, which comprises water, temperature-sensitive expanded fine particles, temperature-sensitive expanded fibers, fine fibers and a weighting agent. According to the well cementation composite plugging spacer fluid system, on the premise that the pumpability of fluid is guaranteed, the bridging and deformation filling capacity of spacer fluid is improved, the plugging effect is enhanced, the pressure bearing capacity of malignant leakage stratums is improved, a good wellbore environment is provided for well cementation construction, and the well cementation composite plugging spacer fluid system has good application and popularization value. 本发明涉及一种固井复合堵漏隔离液体系，包括水、温敏膨胀微细颗粒、温敏膨胀纤维、微细纤维和加重剂。本发明的固井复合堵漏隔离液体系在保证流体可泵性的前提下，提高隔离液的架桥与变形充填能力，增强堵漏效果，有助于提高恶性漏失地层的承压能力，为固井施工提供良好的井筒环境，具有较好的应用和推广价值。