聚合物改性水泥基堵漏工作液体系构建及性能评价

Construction and Performance Evaluation of Polymer Modified Cement-Based Leak Plugging Working Fluid System

针对长庆井区深井钻井中复杂的储层漏失问题,研制新型储层段可固化暂堵堵漏剂对该地区具有重要意义。优选聚合物单体,通过室内实验合成凝胶剂和交联剂,并对油井水泥进行改性,制备聚合物改性水泥基堵漏工作液体系,采用X射线衍射、扫描电子显微镜、HTHP堵漏模拟实验、单轴抗压测试、高温高压稠化等实验分析了工作液体系的性能和堵漏能力。结果表明,聚合物改性水泥基堵漏工作液体系抗压强度最高达到4.8 MPa,在不同温度下体系均可在3~5小时实现稠化,解堵能力良好。

In view of the complex reservoir leakage problem in deep well drilling in the Sichuan-Qinghai area, the development of a new curable temporary plugging agent for reservoir sections is of great significance to the area. Polymer monomers were selected, gelling agents and cross-linking agents were synthesized through indoor experiments, and oil well cement was modified to prepare a polymer-modified cement-based leakage plugging working fluid system. X-ray diffraction, scanning electron microscopy, and HTHP plugging leakage simulation experiments, uniaxial compression tests, high temperature and high pressure thickening experiments and other experiments were used to analyze the performance and leakage plugging ability of the working fluid system. The results show that the maximum compressive strength of the polymer-modified cement-based leak plugging working fluid system reaches 4.8 MPa. The system can thicken in 3-5 hours at different temperatures and has good plugging ability.