摘要
基于胶束增稠和静电屏蔽作用,以1.4%的十八烷基三甲基溴化铵(OTAB)和0.6%的椰油酰胺丙基甜菜碱(CBA)复配作为主剂,0.7%水杨酸钠和0.5%氯化钾作为反离子助剂,0.05%疏水纳米二氧化硅作为增强剂,构建了压裂-采油一体化压裂液体系。该体系由蠕虫状胶束构成的三维网络空间结构组成,在80℃、170 s^(-1)下表观黏度为57 mPa·s,剪切3000 s后,表观黏度保留率大于95%;80℃下携砂沉降速率为0.24 mm/s,滤失系数为1.6×10^(-4)m/min^(1/2),具有良好的压裂特性。岩心驱替实验表明,体系破胶液岩心伤害<10%,提高采收率效果达到16.1%。一体化压裂液体系为高效开发非常规油藏提供了一个潜在可行的技术方案。
Based on the effect of micelles thickening and electrostatic shielding,a fracturing-fluid system has been developed using a formulation consisting of 1.4%octadecyl trimethyl ammonium bromide(OTAB)and 0.6%cocamidopropyl betaine(CBA)as the main agents,along with 0.7%sodium salicylate and 0.5%potassium chloride as counterion additives,and 0.05%hydrophobic nano-silica as a reinforcing agent.This system was consisted by a three-dimensional network structure formed by worm-like micelles,exhibited an apparent viscosity of 57 mPa·s at 80℃and 170 s^(-1),with a viscosity retention rate greater than 95%after shearing at 3000 s.At 80℃,the sand settling rate was 0.24 mm/s,and the filtration coefficient was 1.6×10^(-4)m/min^(1/2),demonstrating good fracturing properties.Core flooding experiments indicated that the core damage caused by the gel-breaking fluid was less than 10%,and the enhanced recovery effect reached 16.1%.This integrated fracturing fluid system provides a potentially feasible technical solution for the efficient development of unconventional reservoirs.
作者
徐昆誉
杨晓倩
牛奇奇
杨皓凌
杨子浩
董朝霞
XU Kunyu;YANG Xiaoqian;NIU Qiqi;YANG Haoling;YANG Zihao;DONG Zhaoxia(Unconventional Petroleum Research Institute,China University of Petroleum-Beijing,Beijing 102249,China;State Key Laboratory of Heavy Oil Processing,China University of Petroleum-Beijing,Beijing 102249,China;China Nuclear Fourth Research and Design Engineering Co.,Ltd.,Shijiazhuang 050022,China;PetroChina Coalbed Methane Co.,Ltd.,Beijing 100028,China)
出处
《应用化工》
北大核心
2025年第1期57-61,67,共6页
Applied Chemical Industry
基金
国家自然科学基金面上项目(52074320)
中国石油战略合作科技专项资助(ZLZX2020-01-04-03)。
关键词
压裂-采油一体化
黏弹性
界面张力
储层伤害
提高采收率
frack-recovery integration
viscoelasticity
interfacial tension
reservoir damage
enhanced oil recovery
