低渗透油藏弹性微凝胶调剖剂OA
Elastic microgel profile control agent for low-permeability reservoirs
针对低渗透油藏非均质性强、易水窜的开发难题,理想调剖剂需兼具良好注入性与有效封堵能力,弹性是影响调剖剂在多孔介质中运移与封堵效果的关键因素.为克服现有调剖剂性能的局限,以丙烯酰胺、丙烯酸、苯乙烯磺酸钠等为原料制备了一种弹性微凝胶调剖剂(以下简称微凝胶).通过结构与形貌表征、热稳定性测试、力学性能测试及岩心封堵实验,结合微观可视化技术,评价了微凝胶的综合性能,并揭示了微凝胶的运移封堵规律.实验结果表明,微凝胶在 200℃以下热稳定性良好;弹性本体宏观凝胶的最大拉伸应力高达439 kPa,断裂伸长率为290%,分别为常规聚丙烯酰胺凝胶的4.57倍与2.9倍,显示出优异的抗拉伸与弹性变形能力;微凝胶在不同矿化度条件下均表现出良好的注入性与封堵能力,且整体封堵效果优于常规聚合物微球;微凝胶在多孔介质中主要以直接通过、变形通过及封堵滞留 3 种方式运移,能够有效封堵优势通道、扩大波及体积,从而提高驱油效率.该微凝胶具有良好的注入性、突出的弹性变形能力和稳定的深部封堵性能,可为低渗透油藏高效开发提供有效的技术支撑.
Low-permeability reservoirs are characterized by strong heterogeneity and are prone to water channeling during development.An ideal profile control agent should therefore possess both good injectivity and effective plugging capacity.Elasticity is a key factor influencing its migration and plugging performance in porous media.To overcome the limitations of existing profile contral agents in balancing these properties,an elastic microgel profile control agent was prepared using acrylamide,acrylic acid,and sodium styrene sulfonate as the main raw materials.Its plugging performance was systematically evaluated and its migration and plugging behavior was revealed by means of structural and morphological characterization,thermal stability analysis,mechanical performance testing,and core plugging experiments in conjunction with microscopic visualization.The results show that the microgel exhibits good thermal stability below 200℃.Mechanical tests indicate that the elastic bulk macrogel has a maximum tensile stress of 439 kPa and an elongation at break of 290%,which are 4.57 and 2.9 times those of conventional polyacrylamide gel,respectively,demonstrating excellent tensile resistance and elastic deformation capability.Core flooding experiments further confirm that the microgel exhibits good injectivity and plugging performance under different salinity conditions,and its overall plugging effect is superior to that of conventional polymer microspheres.Microscopic visualization experiments further reveal that the microgel can migrate in porous media through three modes:direct passage,deformable passage,and retention plugging,thereby effectively blocking dominant flow channels and enlarging the swept volume,which in turn improves oil displacement efficiency.In summary,the elastic microgel profile control agent exhibits good injectivity,outstanding elastic deformation capability,and stable deep plugging performance,and thus can provide effective technical support for the efficient development of low-permeability reservoirs.
张亚茹;郑力军;张磊;刘云龙;马国艳
西安石油大学 化学化工学院,陕西 西安 710065中国石油 长庆油田分公司 油气工艺研究院,陕西 西安 710018中国地质大学(武汉) 资源学院,湖北 武汉 430074中国石油 长庆油田分公司 油气工艺研究院,陕西 西安 710018西安石油大学 化学化工学院,陕西 西安 710065
化学化工
低渗透油藏弹性微凝胶力学性能封堵运移
low-permeability reservoirelastic microgelmechanical propertypluggingmigration
《石油化工》 2026 (9)
1366-1373,8
国家自然科学基金项目(52204054)陕西省教育厅科研计划(24JC070).
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