Petroleum resins have excellent thermal tolerance and selective plugging capability. As the environment temperature exceeds their softening point, petroleum resins transform from a solid into a viscous Newton fluid, accompanied by the transformation of the system from particle dispersoid to emulsion. The presence of phase transition decides that the seepage regularity and plugging characteristics of petroleum resins are different from either particle dispersoid or emulsion. Herein, rheological measurements and physical model flooding experiments were performed to investigate the injection and plugging performance of petroleum resins. A correlation chart of the injection pressure, formation permeability, and the ratio of resin particle size to pore diameter is established. The dispersoid is demonstrated to present good injectivity when the ratio of the resin particle size to the pore‐throat diameter of the porous media is lower than 0.35. Moreover, when the environment temperature is lower than or around the petroleum resin softening point, the injection performance of the dispersoid is not affected by temperature. Comparably, while the environment temperature is 30 °C higher than the resin softening point, the injection pressure increases due to phase transition. As indicated by the plugging experiment, the presented petroleum resin dispersoid plugging agent manifests excellent performance even in the case that the permeability of water‐channeling paths is up to 20 μm², reaching a water plugging efficiency of over 85%. For water‐channeling fractures with widths of 0.05–0.5 mm, the plugging pressure gradient can exceed 5 MPa m⁻¹. As suggested by combined analysis of injection and plugging performance, the disperse system should be optimized in accordance with the formation condition during field practice. Specifically, the ratio of the resin particle size to the formation pore diameter should be kept lower than 0.35, while the softening point of the petroleum resin should be 10–20 °C lower than the formation temperature.

中文翻译：

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具有相变行为的乳液渗透特性

石油树脂具有出色的耐热性和选择性堵塞能力。当环境温度超过其软化点时，石油树脂会从固体转变为粘稠的牛顿流体，并伴随着系统从颗粒分散体转变为乳液。相变的存在决定了石油树脂的渗透规律和堵塞特性不同于颗粒分散体或乳液。在此，进行流变学测量和物理模型驱油实验以研究石油树脂的注入和堵塞性能。建立了注射压力，地层渗透率和树脂粒径与孔径之比的相关图。当树脂粒度与多孔介质的孔喉直径之比低于0.35时，表明分散体具有良好的注入性。此外，当环境温度低于或低于石油树脂软化点时，分散质的注入性能不受温度的影响。相比之下，当环境温度比树脂软化点高30°C时，由于相变，注射压力会增加。如堵漏实验所示，即使在水通道的渗透率高达20μm的情况下，本发明的石油树脂分散胶堵剂也表现出优异的性能。当环境温度低于或低于石油树脂软化点时，分散体的注入性能不受温度的影响。相比之下，当环境温度比树脂软化点高30°C时，由于相变，注射压力会增加。如堵漏实验所示，即使在水通道的渗透率高达20μm的情况下，本发明的石油树脂分散胶堵剂也表现出优异的性能。当环境温度低于或低于石油树脂软化点时，分散体的注入性能不受温度的影响。相比之下，当环境温度比树脂软化点高30°C时，由于相变，注射压力会增加。如堵漏实验所示，即使在水通道的渗透率高达20μm的情况下，本发明的石油树脂分散胶堵剂也表现出优异的性能。²，达到超过85％的堵水效率。对于宽度为0.05–0.5 mm的导水裂缝，堵塞压力梯度可能会超过5 MPa m ^-1。如结合注入和堵漏性能的分析所建议的那样，在野外实践中应根据地层条件优化分散体系。具体而言，树脂粒径与地层孔径的比率应保持低于0.35，而石油树脂的软化点应比地层温度低10–20°C。