超低渗火山岩储层压裂液伤害实验及机理研究  

Experimental and mechanistic study of fracturing fluid injury in ultra-low permeability volcanic reservoirs

作　　者：李园哲 田雨 郑皓轩 杨林[1] 安锋涛 师永民 LI Yuanzhe;TIAN Yu;ZHENG Haoxuan;YANG Lin;AN Fengtao;SHI Yongmin(Shaanxi University of Science and Technology,Shaanxi Provincial Key Laboratory of Light Chemical Auxiliaries,Xi’an 710021,China;School of Earth and Space Sciences,Peking University,Beijing 100871,China)

机构地区：[1]陕西科技大学陕西省轻化工助剂重点实验室,陕西西安710021 [2]北京大学地球与空间科学学院,北京100871

出　　处：《应用化工》2024年第10期2267-2271,共5页Applied Chemical Industry

基　　金：国家自然科学基金(51904180)。

摘　　要：胍胶与聚合物压裂液体系对超低渗火山岩储层具有不同的伤害特征,胍胶压裂液破胶后残渣含量高,易堵塞填砂裂缝,降低裂缝导流能力。聚合物压裂液具有破胶彻底、残渣含量小等特征。通过X射线衍射、BET技术对取自4045~4669 m的查干花地区某井区5组火山岩样品的矿物组成和比表面积进行表征。通过岩心吸附实验定量评价了压裂液对储层岩心的伤害。测试伤害前后的Zeta电位、接触角、红外光谱和SEM等实验分析压裂液对储层的伤害机理。结果表明,两种压裂液在岩心粉末表面只发生了物理吸附,胍胶吸附量比聚合物高33.6%;胍胶与岩心粉末接触引起Zeta电位绝对值变小,体系失稳易在岩心表面吸附滞留;疏水性增加导致接触角变大。Guanidine gel and polymer fracturing fluid systems have different injury characteristics for ultra-low permeability volcanic reservoirs.Guanidine gel fracturing fluid has a high content of residue after breaking the gel,which is easy to block sand-filled cracks and reduce the capacity of fracture inflow.Polymer fracturing fluids are characterised by thorough gel breakage and low residue content.The mineral composition and specific surface area of five groups of volcanic rock samples from a well area in the Chaganhua region taken from 4045~4669 m were characterised by X-ray diffraction and BET techniques.Quantitative evaluation of fracturing fluid damage to reservoir cores by core adsorption experiments.Zeta potential,contact angle,infrared spectroscopy and SEM before and after testing the injury were used to analyse the mechanism of fracturing fluid injury to the reservoir.Only physical adsorption of both fracturing fluids occurred on the core powder surface,with guanidine gum adsorption being 33.6%higher than polymer.The contact between guanidine gum and core powder causes the absolute value of Zeta potential to become smaller,and the system is unstable and easy to be adsorbed and retained on the core surface.Increased hydrophobicity leads to larger contact angles.

关 键 词：ZETA电位 接触角 储层伤害 低渗透火山岩 压裂液吸附 

分 类 号：TQ317[化学工程—高聚物工业]