| 摘要: |
| 近年来，CO2干法压裂技术作为一种新型无水压裂技术已成为致密油气藏开发的重要研究方向。经调研发现，CO2干法压裂技术尚未成熟，主要是因液态或超临界CO2黏度低而存在滤失量大、携砂性能差等问题，需要加入增稠剂来提高CO2的黏度。针对硅氧烷类增稠剂需借助大量助溶剂、其他增稠剂而增稠效果不理想、温度压力适应性差等问题，从增稠机理和增稠特性两方面概述了目前支化硅氧烷类（不使用或少量使用助溶剂）及含氟类增稠剂CO2压裂液增稠剂的研究进展，并在增稠特性部分综述了这两类增稠剂的结构特征和性能特点。其次，对国内相关液态CO2和超临界CO2干法压裂技术现场应用进行综述。最后，分别从增稠机理、增稠性能和现场应用方面对干法压裂CO2增稠剂及其压裂液体系未来的研究方向进行了展望。 |
| 关键词: 干法压裂 超临界CO2 增稠剂 压裂液 |
| DOI：10.3969/j.issn.1007-3426.2024.04.009 |
| 分类号: |
| 基金项目:中国石油西南油气田公司对外交流与合作项目“页岩用二氧化碳驱替压裂液关键技术研究”（20230302-33） |
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| Research status and application progress of branched siloxane and fluorine-containing polymer thickeners for dry fracturing of carbon dioxide |
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Daijun DU1,2, Jintao LI1,2, Wanfen PU1,2, Jinzhou ZHAO1,2, Ying XIONG3
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1.State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu, Sichuan, China;2.School of Petroleum & Gas Engineering of Southwest Petroleum University, Chengdu, Sichuan, China;3.Research Institute of Natural Gas Technology, PetroChina Southwest Oil & Gasfield Company, Chengdu, Sichuan, China
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| Abstract: |
| CO2 dry fracturing technology, as a new waterless fracturing technique, has become an important research direction in tight oil and gas development in recent years. However, based on literature research, it is found that CO2 dry fracturing technology is not yet mature, mainly due to the low viscosity of liquid carbon dioxide or supercritical CO2 , which leads to significant fluid loss and poor proppant carrying capacity. It requires thickening agents to significantly increase the viscosity of CO2. Considering the limitations of silicone-based thickeners that require a large amount of co-solvent and other thickeners with unsatisfactory thickening effects, as well as poor temperature and pressure adaptability, this paper provides an overview of the research progress on thickeners for CO2 fracturing fluids, focusing on branched silicone-based thickeners (with little or no co-solvent) and fluorinated thickeners from the perspectives of thickening mechanisms and thickening characteristics. In the thickening characteristics section, the structural and performance characteristics of these two types of thickeners are summarized. Additionally, the paper reviews the application of liquid CO2 and supercritical CO2 dry fracturing technology in China. Finally, the future research directions for CO2 thickeners and fracturing fluid systems in dry fracturing, including thickening mechanisms, thickening performance, and field applications, are discussed. |
| Key words: dry fracturing supercritical CO2 thickener fracturing fluid |
