CO2驱防窜封堵用弱凝胶体系探究及应用OA
Exploration and Application of Weak Gel System for Channeling Control and Plugging in CO₂ Flooding
传统的聚合物在高温和高盐度条件下不能满足防窜封堵要求,迫切需要更具耐久性的材料.合成了两种基于丙烯酰胺的预成型颗粒凝胶(PPG)——聚电解质型水凝胶(DJZ-1)和聚两性离子型水凝胶(LXLZ-2),用于提高CO2封堵效率;利用Ritger-Peppas和Yavari-Azizian模型,分析了凝胶在不同温度、盐度和pH条件下的溶胀行为.结果表明,DJZ-1、LXLZ-2在水中的溶胀度分别为56、18;随着离子强度增加,DJZ-1的溶胀度显著下降,而LXLZ-2基本保持不变;pH变化仅使DJZ-1的溶胀度增加,对LXLZ-2无影响;LXLZ-2能在120℃的油藏条件下保持长期热稳定性,两个体系都能有效地发挥PPG弱凝胶体系.
Conventional polymers fail to meet the requirements for channeling control and plugging under high temperature and high salinity conditions,creating an urgent demand for more durable materials.Two acrylamide-based preformed particle gels(PPGs):polyelectrolyte-based(DJZ-1)and polyzwitterionic-type(LXLZ-2)were synthesized for enhancing CO2 plugging efficiency.The swelling behavior of the gel was analyzed under different temperature,salinity and pH conditions using Ritger-Peppas and Yavari-Azizian models.The results indicate that the swelling degrees of DJZ-1 and LXLZ-2 in water are 56 and 18 respectively.With the rise of ionic strength,the swelling degree of DJZ-1 declines remarkably,whereas that of LXLZ-2 stays nearly constant.Changes in pH value only elevate the swelling degree of DJZ-1 and have no impact on LXLZ-2.LXLZ-1 can maintain long-term thermal stability under reservoir conditions at 120℃,and both systems can effectively exert the performance of PPG weak gel systems.
徐涛
中国石油化工股份有限公司江汉油田分公司 石油工程技术研究院,湖北 武汉 430000
化学化工
防窜封堵凝胶聚合物驱替耐温耐盐
Channeling control and pluggingGelsPolymersFloodingTemperature resistantSalt resistant
《石油化工高等学校学报》 2026 (3)
58-63,6
国家自然科学基金项目(52404042)江汉油田分公司盐间页岩油有效动用项目(JKKBF0625002).
评论