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SiO2纳米颗粒强化的CO2泡沫压裂液体系
吕其超1,张星2,周同科1,3,郑嵘3,左博文1,李宾飞3,李兆敏3
(1.中国石油大学(北京)非常规油气科学技术研究院,北京 102249;2.中国石油化工股份有限公司胜利油田分公司石油工程技术研究院,山东东营 257017;3.中国石油大学(华东)石油工程学院,山东青岛 266580)
摘要:
随着CO2泡沫压裂技术的发展,传统聚合物增稠型泡沫强化剂暴露出难破胶、高残渣、伤害地层等问题。将SiO2纳米颗粒作为CO2泡沫压裂液的新型强化剂,系统研究强化泡沫的界面流变性、生成及稳定性、黏度、滤失及伤害性。结果表明:SiO2纳米颗粒吸附在泡沫气液界面上增大了界面粗糙度,并提升了高温高压下界面黏弹模量,增强了泡沫液膜抵抗及恢复形变能力;虽然强化泡沫的生成能力减弱,但泡沫在高温高压下的稳定性获得显著提升,且其生成能力随压力增大而增强;泡沫质量分数为50%~93%时,0.5%的SiO2纳米颗粒将泡沫有效黏度提高了2.2~4.8倍,同时泡沫滤失控制能力增强,气、液相滤失系数对渗透率的敏感性减弱;强化泡沫具备低伤害性。
关键词:  CO2泡沫  纳米颗粒  压裂液  稳定性  动态滤失
DOI:10.3969/j.issn.1673-5005.2020.03.013
分类号::TE 357
文献标识码:A
基金项目:国家自然科学基金项目(51574264);国家“863计划”项目(2013AA064803);中国石油大学(北京)科研基金项目(2462018YJRC025)
CO2 foam fracturing fluid system enhanced by SiO2 nanoparticles
LÜ Qichao1, ZHANG Xing2, ZHOU Tongke1,3, ZHENG Rong3, ZUO Bowen1, LI Binfei3, LI Zhaomin3
(1.Unconventional Petroleum Research Institute in China University of Petroleum (Beijing), Beijing 102249, China;2.Petroleum Engineering Research Institute of Shengli Oilfield, SINOPEC, Dongying 257017, China;3.College of Petroleum Engineering in China University of Petroleum (East China), Qingdao 266580, China)
Abstract:
With the development of CO2 foam fracturing technology, a series of problems such as incomplete gel breaking, high residue content and damage of formation permeability have been exposed by traditional polymer thickened foam intensifiers. The SiO2 nanoparticles as a new type of enhancer for CO2 foam fracturing fluid was explored. Its effects on interfacial rheology, foam generation and stability, viscosity, filtration and permeability damage of the foam systems were systematically studied. The results show that the adsorption of SiO2 nanoparticles on gas-liquid interface increases the interficial roughness, and improves the interficial viscoelastic modulus under high temperature and pressure. This enhances the capacity of foam film to resist and recover the deformation. Although SiO2 nanoparticles reduce the foam generation capacity, foam stability under high temperature and pressure is significantly improved, and the foam generation capacity increases with the pressure increasing. When the foam quality is 50%-93%, the foam viscosity is increased about 2.2 to 4.8 times by the addition of SiO2 nanoparticles. Moreover, the filtration control capacity of CO2 foam is enhanced by nanoparticles, and the sensitivity of gas and liquid phase filtration coefficient to permeability is weakened. The core damage of nanoparticle enhanced foam is low.
Key words:  CO2 foam  nanoparticle  fracturing fluid  stability  dynamic filtration
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