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首页> 外文会议>Proceedings of the 4th International Symposium-multi-field Coupling Theory of Rock and Soil Media and its Applications >Effect Study of Cr3+ on Polymer Molecular Aggregate and Seepage Flow Characteristics
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Effect Study of Cr3+ on Polymer Molecular Aggregate and Seepage Flow Characteristics

机译：Cr3 +对聚合物分子团聚体和渗流特性的影响研究

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Bohai oilfield is characterized by thick layers, high average permeability, serious heterogeneity, high viscosity crude oil and injection water salinity, which resulted in poor water-flooding recovery.So there is an urgent need to take new technologies to improve the water-flooding efficiency.Based on the theories of reservoir engineering, physical chemistry and polymer materials, by means of chemical analysis, instrumental detection and physical modeling, set evaluating indicators of polymer molecular aggregate, viscosity, resistant coefficient and residual resistance factor, set the LD10-1 oilfield reservoir conditions as the study object, conduct performance evaluation and mechanism analysis of the "salt-resistant" polymer solution and the "high molar mass" Cr3+ polymer gel.The results showed that at the early time of adding cross-linking agents to the polymer solution, Cr3+ mainly leads to the cross-linking reaction of different branches (carboxyl) on the same polymer molecular chain.Polymer molecular chains in the polymer gel are mainly "local reticular" aggregate.At that time, polymer molecular clew dimension increase is not big, and the viscosity hardly increases.As time went on, Cr3+ begins to actuate the cross-linking reaction among branched chains (carboxyl) on different polymer molecules, and polymer molecule chains in the polymer gel are mainly "local reticular" aggregate, the viscosity increases prominently, and its compatibility with the oil reservoir becomes poor.Compared with the molecular chain in the salt-resistant polymer solution presenting "linear and branched" aggregate, flexibility of the "local reticular" aggregate in the Cr3+ polymer gel becomes weak, and its rigidity increases, which showed excellent fluid steering capability.What's more, when Cr3+ polymer gel was diluted by injected water, its molecular clew dimension would increase, and its blocking effect to rock pore was enhanced, which made the residual resistance factor higher than the resistance factor, and showed peculiar permeability characteristics from common polymer solution.
机译：渤海油田地层厚，平均渗透率高，非均质性严重，原油粘度高，注水含盐量大，注水采收率差，迫切需要采用新技术提高注水效率。基于储层工程，物理化学和高分子材料的理论，通过化学分析，仪器检测和物理建模，设定聚合物分子聚集体，粘度，抗力系数和残余抗力系数的评价指标，确定了LD10-1油田以储层条件为研究对象，对“耐盐”聚合物溶液和“高摩尔质量” Cr3 +聚合物凝胶进行性能评价和机理分析。结果表明，在聚合物中添加交联剂的初期溶液中，Cr3 +主要导致同一聚合物分子上不同支链（羧基）的交联反应聚合物凝胶中的聚合物分子链主要是“局部网状”聚集体。当时，聚合物分子的线团尺寸增加并不大，并且粘度几乎没有增加。随着时间的流逝，Cr3 +开始激活交联反应。在不同聚合物分子上的支链（羧基）之间，并且聚合物凝胶中的聚合物分子链主要是“局部网状”聚集体，粘度显着增加，并且与油藏的相容性变差。与盐中的分子链相比呈“线性和支链”聚集体的高抗性聚合物溶液，Cr3 +聚合物凝胶中“局部网状”聚集体的柔韧性变弱，并且其刚性增加，表现出出色的流体操纵能力。此外，当Cr3 +聚合物凝胶被稀释后，注入水后，其分子线团尺寸将增加，并且对岩石孔隙的阻塞作用增强，这使得残余阻力系数高于电阻系数，并显示出普通聚合物溶液特有的渗透特性。

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