西南石油大学学报（自然科学版）2016，Vol.38Issue(3)：150-155,6.DOI:10.11885/j.issn.1674-5086.2014.03.28.01
酸预处理在水力压裂中降低伤害机理研究
A Study on Damage Reduction Mechanism of Acid Preflushing During Hydraulic Fracturing
摘要
Abstract
Hydraulic fracturing is an effective way to develop low permeability reservoir. However,halfway gelout,fracturing fluid residue and filtrate damage often reduce stimulation effect. On-site application of acid pretreatment fracturing technol-ogy has been proved to be able to reduce damage during fracturing,but the damage reduction mechanism of acid pretreatment remains unclear. In this paper,molecular dimensions of guar gum under both conventional and acidic conditions are quanti-tatively observed by using laser particle analyzer(LPSA). Principle factors affecting the damage of gelout fluid to matrix in acidic environment are also researched here. In addition,microanalysis of damaged core edge after injecting gelout fluid and acid fluid is conducted by means of scanning electron microscope(SEM). We can draw conclusions from the results:molecular dimension of guar gum after gelout is significantly reduced under acidic condition,and the reduction of molecular dimension plays more important role than acidic environment in decreasing damage;acid fluid is able to effectively remove damage caused by fracturing fluid,increase core permeability,and form corrosion channels.关键词
酸液/预处理/水力压裂/压裂液/瓜胶尺寸/伤害Key words
acid fluid/preflushing/hydraulic fracturing/fracturing fluid/guar gum molecular dimensions/damage分类
能源科技引用本文复制引用
刘平礼,兰夕堂,李年银,罗志锋,刘书杰..酸预处理在水力压裂中降低伤害机理研究[J].西南石油大学学报（自然科学版）,2016,38(3):150-155,6.基金项目
国家科技重大专项（2011ZX0503000508）。 （）
