Research on the properties of in situ emulsified active associative polymer with low molecular weight based on low permeability oil reservoirs

IF 2.2 4区化学 Q3 CHEMISTRY, PHYSICAL Colloid and Polymer Science Pub Date : 2024-01-17 DOI:10.1007/s00396-023-05220-z

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Abstract

The development of oil and gas resources in low-permeability reservoirs is being paid more and more attention. Moreover, oil and gas resources in low-permeability reservoirs are affluent, and the water cut of the medium permeability layer is so high that the injection capacity has decreased significantly. Therefore, it is of great importance to address the issues of injectability and enhance oil recovery in low-permeability reservoirs. Given the existing conditions of low permeability and high water cut in Daqing Oilfield, the synthesis of an in situ emulsified associative polymer (ISEPAM) is the focus of the research. The polymer was prepared by micellar polymerization, ensuring a molecular weight of 5 × 10⁶ Dalton. A series of experiments were conducted to investigate its dissolution filtration property, viscosifying, emulsification, anti-adsorption, conductivity, and oil displacement capacity. The experimental results show that ISEPAM has more significant properties than the polymeric surfactant (HB) used in Daqing Oilfield. The ISEPAM solution has significant filterability (filter factor is 1.1), viscosifying (38.66 mPa·s), emulsification (the water evolution rate of ISEPAM was only 4.4% for 60 min at 90% water cut), and good anti-adsorption property (after five adsorptions, still has a viscosity retention rate of 65%) in a specific concentration (1000 mg/L) and the field water in Daqing Oilfield (salinity is 4996.3 mg/L). The reason for this is due to the presence of dynamic reversible networks in the ISEPAM solution, and there are no cationic functional groups on the polymer chain. The conductivity of ISEPAM was tested using a homogeneous square core with 48.1 mD permeability, and the results show that the viscosity retention rate of the effluent can reach 90% and excellent injection property can be achieved. In the oil displacement test, ISEPAM presents excellent sweep efficiency and enhanced oil recovery by about 25% under 50 mD permeability. Under low permeability conditions, the ISEPAM exhibits better injectability and excellent oil displacement capacity. The related findings can provide an important idea and reference for the design and development of EOR polymers in the reservoirs with low permeability or high water cut.

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基于低渗透油藏的低分子量原位乳化活性缔合聚合物特性研究

摘要低渗透储层油气资源的开发越来越受到重视。此外，低渗透油气藏油气资源富集，中渗透层断水量大，注采能力明显下降。因此，解决低渗透油藏的注入能力问题，提高低渗透油藏的石油采收率具有重要意义。鉴于大庆油田现有的低渗透、高断水条件，原位乳化缔合聚合物（ISEPAM）的合成是研究的重点。该聚合物采用胶束聚合法制备，分子量为 5 × 106 道尔顿。对其溶解过滤性能、增粘、乳化、抗吸附、电导率和油置换能力进行了一系列实验研究。实验结果表明，与大庆油田使用的聚合物表面活性剂（HB）相比，ISEPAM 具有更显著的性能。在特定浓度（1000 mg/L）和大庆油田油田水（盐度为 4996.3 mg/L）条件下，ISEPAM 溶液具有显著的过滤性（过滤系数为 1.1）、增粘性（38.66 mPa-s）、乳化性（在 90% 断水条件下，60 分钟内 ISEPAM 的水演化率仅为 4.4%）和良好的抗吸附性（经过五次吸附后，粘度保持率仍为 65%）。其原因是 ISEPAM 溶液中存在动态可逆网络，聚合物链上没有阳离子官能团。使用渗透率为 48.1 mD 的均质方形岩心对 ISEPAM 的导电性进行了测试，结果表明流出物的粘度保持率可达 90%，并可获得优异的注入性能。在石油置换试验中，ISEPAM 表现出优异的扫油效率，在 50 mD 渗透率条件下提高石油采收率约 25%。在低渗透率条件下，ISEPAM 表现出更好的注入性和优异的石油置换能力。相关研究结果可为低渗透或高含水油藏中 EOR 聚合物的设计和开发提供重要的思路和参考。

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来源期刊

Colloid and Polymer Science 化学-高分子科学

CiteScore

4.60

自引率

4.20%

发文量

111

审稿时长

2.2 months

期刊介绍： Colloid and Polymer Science - a leading international journal of longstanding tradition - is devoted to colloid and polymer science and its interdisciplinary interactions. As such, it responds to a demand which has lost none of its actuality as revealed in the trends of contemporary materials science.