支化预交联凝胶颗粒在油藏中的运移与调剖特性

调剖剂在多孔介质中的运移能力是影响其深部调剖性能的关键。支化预交联凝胶颗粒（B-PPG）是一种在PPG基础上发展的带有支化链的新型调剖剂，支化结构的引入能够增强其膨胀性能，提高颗粒弹性变形能力，使其通过弹性形变通过孔喉，运移至油藏深部调剖。针对该型调剖剂，设计了孔隙介质中的运移与调剖实验，重点考察了其微观运移与封堵特征、不同渗透率条件下的深部运移能力和调剖效果。结果表明，B-PPG膨胀能力较部分PPG强（体积/粒径膨胀倍数为47.3/3.6）。粒径大于喉道直径的B-PPG能够通过弹性形变通过孔喉，同时以单颗粒或多颗粒堆积的方式对孔喉形成暂时性和反复性的封堵。在匹配渗透率条件下（1.6~3.2D），B-PPG能够运移至模型深部，实现液流转向，扩大波及体积，为实现非均质油藏深部调剖提供了可行的技术选择。

Migration and Profle Control Properties of B-PPG in Oil Reservoirs

IMigration capacity of is a critical property of profile-control agents for achieving in-dept profile improvement. B-PPG (branched-performed particle gel), a newly developed profile-control agent basing on the traditional PPG, performs increased expansion capacity and enhanced elastic-deformation ability due to the introduction of branched structures, which makes it capable of transporting to depth of reservoirs for improving water-absorption profile. Focusing on this agent, migration and profile-control experiments in porous media were designed to evaluate its microscopic migration and plugging features, in-depth migration and profile control performance under different permeabilities. The results show that B-PPG is more expansive than PPG with the volume/size swelling factor of 47.3/3.6. B-PPG with a greater size than the diameter of a pore, could pass through the pore by elastic deformation, and simultaneously, plug it temporarily and repeatedly in the form of a single particle or the accumulation of multiple particles. Under the matching permeabilities (1.6~3.2 D), B-PPG can migrate to the depth of the model, diverting the liquid flow, as a result, expanding the sweep volume, and finally providing a feasible technical choice for in-depth profile control in heterogeneous reservoirs.