A Smart Plugging System of Temperature-Sensitive Gels Based on Cellulose Ether

作者：Yunbao Zhang, J. Wang, D. Chen, Ge Song, Jianfeng Fu, Xiaoyang Wu, Huijun Li, Ruirui Wang, Rui linHAN, Xin Tian, Hui Ma · 发表于：ACS Omega · 年份：2025 · DOI：10.1021/acsomega.5c01828 · 被引用次数：5 · 研究领域：Enhanced Oil Recovery Techniques、Hydraulic Fracturing and Reservoir Analysis、Drilling and Well Engineering

High Resolution Image Download MS PowerPoint Slide The smart plugging system of temperature-sensitive gels is a new type of colloid developed to enhance the recovery rate of hot water drive mining in thick oil reservoirs in China’s Bohai Oilfield. Existing gel plugging agents exhibit poor adaptability under hot-water drive conditions, and the temperature fluctuations in the reservoir caused by hot water flooding make it difficult to effectively block the high permeability layers. The average reservoir temperature in the target block of the Bohai Sea is 50 °C–60 °C, the peak temperature can reach 100–110 °C when injecting hot water, and the conventional gel easily loses the plugging capacity. Thus, it is necessary to develop a smart plugging reagent that responds to temperature changes in the dominant channel. In this study, we used cellulose ether as the main agent and added auxiliaries, such as a reinforcing agent, a complexing agent, and a regulator, to form a temperature-sensitive gel system through physical cross-linking. Subsequently, injection performance, plugging performance, and scouring resistance as well as cooling and plugging removal performance experiments were conducted in porous media. The results demonstrated that the preferred system composition was cellulose ether 1 # (0.5%–1.0%) + nanosilica (0.2%) + HEDP·4Na (0.5%–1.0%) + urea (0–0.5%). The nanosilica reinforcing agent can enhance the gelation effect of the system. Moreover, HEDP·4Na forms a complex with ...