Construction and Performance Evaluation of CO2 Responsive Thickening System

doi:10.12388/j.issn.1673-2677.2026.01.014

Abstract

Abstract: To address the issue of reduced oil recovery caused by CO₂ channeling during CO₂ flooding in low permeability reservoirs，a salt-tolerant and temperature-resistant plugging system with low initial viscosity and high CO₂ responsiveness was developed using erucamidopropyl dimethylamine （PKO‑E） and a counterion salt. The basic properties of the system，along with its injectivity and plugging performance under simulated low permeability reservoir conditions，were systematically investigated. Experimental results showed that at 70 ℃ and a salinity of 9 824.97 mg/L，the CO₂-responsive thickening system exhibited an initial viscosity below 4.7 mPa·s，which increased to above 600 mPa·s after CO₂ introduction，confirming its low initial viscosity and strong CO₂-induced thickening characteristics. The system also demonstrated high salt resistance and thermal stability-maintaining viscosities of 453.97 mPa·s at 70 ℃ with a salinity of 2.5×10⁴ mg/L and 512.26 mPa·s at 90 ℃ with a salinity of 9 824.97 mg/L. In plugging tests using low permeability cores，the injection pressure remained below 0.3 MPa，the plugging efficiency exceeded 96%，the gas reduction rate was above 96%，and the breakthrough pressure reached over 2.31 MPa，which proved the high efficiency sealing capability of the system for CO₂ channeling pathways in low permeability formations. This study provides a useful reference for enhancing oil recovery in such reservoirs.

Key words: CO₂-responsive thickening, low permeability reservoir, temperature resistance, salt resistance, tertiary amine compound

摘要： 针对低渗透油层CO₂驱采油过程中出现CO₂气窜导致的采收率下降等问题，以芥酸酰胺丙基二甲基叔胺（PKO-E）和反离子盐构建了一种具有低初始黏度、高CO₂响应性的抗盐耐温封堵体系。针对该体系的基本性能和低渗透油层环境下的注入、封堵性能展开研究。实验结果表明：在温度70 ℃，矿化度9 824.97 mg/L条件下，CO₂响应增稠体系初始黏度在4.7 mPa·s以下，通入CO₂响应增稠后黏度达到600 mPa·s以上，具有低黏、高CO₂响应的特性；在温度70℃，矿化度2.5×10⁴ mg/L条件下CO₂响应增稠体系黏度为453.97 mPa·s；在温度90℃，矿化度9 824.97 mg/L条件下CO₂响应增稠体系黏度为512.26 mPa·s，表明体系具有良好的抗盐耐温性能。在低渗透岩心注入封堵实验中，注入压力小于0.3 MPa，封堵率超过96%，气体减少率达到96%以上，突破压力达到2.31 MPa以上，证明其对低渗透储层中的CO₂气窜通道具有高效封堵能力。研究成果为低渗透油层提高采收率提供了一定参考。

关键词: CO₂响应增稠, 低渗油藏, 抗温, 抗盐, 叔胺基化合物

CLC Number:

TQ423

ZHENG Cunchuan, SONG Yi, CHEN Shengen, PANG Zhequn, ZHOU Bidong, JING Qianlong.

Construction and Performance Evaluation of CO₂ Responsive Thickening System [J]. Xinjiang Oil & Gas, 2026, 22(1): 125-132.

郑存川, 宋翼, 陈神根, 庞喆群, 周必东, 景乾隆.

二氧化碳响应增稠体系的构建及性能评价 [J]. 新疆石油天然气, 2026, 22(1): 125-132.

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Construction and Performance Evaluation of CO₂ Responsive Thickening System

二氧化碳响应增稠体系的构建及性能评价

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