新型防漏水泥浆体系研制与性能评价

Development and performance evaluation of a novel anti-leakage cement slurry system

摘要:

针对固井过程中水泥浆漏失低返的技术难题，本文以提高水泥浆自身防漏能力为出发点，开展了新型防漏水泥浆体系的研究。首先研制了一套基于API失水仪改造的全密封式堵漏性能评价装置，并建立了相应的评价方法。基于“刚性架桥、弹性填充、纤维网捕”的协同防漏机制，通过系统研选与正交试验，优化研制出由刚性颗粒、温控可形变颗粒及复合纤维复配而成的新型堵漏材料ZJY-1。室内评价表明：ZJY-1与常规及抗高温水泥浆体系均具有良好的配伍性；其在有效维持水泥浆流变性、游离液及抗压强度等关键工程性能的同时，可将1 mm孔隙与裂缝的封堵承压能力提高至7 MPa，且稠化时间可通过缓凝剂进行灵活调控，综合性能优于对比的商用材料。本研究为实现固井过程中的动态堵漏、简化固井工艺、提高复杂地层固井质量提供了有效的技术支持。

Abstract:

To address the technical challenge of cement slurry lost circulation and low return during cementing operations， this study focuses on enhancing the self-sealing capability of the cement slurry itself. A novel anti-leakage cement slurry system was developed in this work. Initially， a fully sealed leakage evaluation apparatus was developed based on the modification of the API fluid loss tester， and a corresponding evaluation methodology was established. Guided by a synergistic anti-leakage mechanism of "rigid bridging， elastic filling， and fiber network capturing"， a novel lost circulation material， ZJY-1， was optimized through systematic material selection and orthogonal experiments. ZJY-1 is a composite of rigid particles， temperature-sensitive deformable particles， and composite fibers. Laboratory evaluations demonstrate that ZJY-1 exhibits excellent compatibility with both conventional and high-temperature cement slurry systems. While effectively maintaining key engineering properties such as rheology， free fluid， and compressive strength of the set cement， this material enhances the sealing pressure-bearing capacity for 1 mm pores and fractures to 7 MPa. Its thickening time can be flexibly adjusted by using retarders， and its overall performance surpasses that of the commercial materials used for comparison. This research provides effective technical support for achieving dynamic leak sealing during cementing， simplifying the cementing process， and improving cementing quality in complex formations.