ArticleACS omega2025
A Smart Plugging System of Temperature-Sensitive Gels Based on Cellulose Ether.
Article in ACS omega, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 2 papers.
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Who cites it
2 citing papers in PubMed.
- Action Mechanism, Research Progress and Development Trend of High-Temperature Steam Flooding and Profile Control/Flooding Systems.Gels (Basel, Switzerland) · 2026Review
- Preparation and Application of Cellulose-Based Thermosensitive Polymer in Water-Based Drilling Fluid.Polymers · 2026Article
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Authors and funding
11 authors.
Funding
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Abstract
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 calcium and ionic magnesium to form a multinetwork system that can enhance the elasticity of the system. Urea increases the gelation temperature, while an increase in the salinity reduces the gelation temperature. By adjusting the added auxiliary and degree of salinity, the system can be controlled to gel at 50-100 °C. Core experiments showed that the plugging rate of the system can exceed 96% under a permeability of 3000-7000 × 10
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Registered trials
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