摘要
选取苏里格气田的2块岩心,借助扫描电镜分析、X-射线能谱分析和全岩X-衍射分析手段,开展了饱和地层水条件下液态CO_2对岩心渗透率影响的研究。研究结果表明,引起岩心渗透率损害的原因有:岩心中微粒及黏土矿物发生运移导致孔喉堵塞;孔隙空间被岩石吸附的CO_2占据;CO_2与地层水中的Ca^(2+)发生化学反应,生成了难溶的CaCO_3垢。
In order to study the influence of liquid carbon dioxide on core permeability under the condition of satu- rated formation water, two cores of Sulige gas field are selected for experimental study, by means of scanning elec- tron microscopy, X- ray energy spectrum analysis and full rock X -diffraction analysis. The results show that the three factors that cause core permeability damage are the obstruction of the pore throat caused by rock particles and clay mineral migration, the CO2 adsorbed by rock occupying a certain pore space, and the insoluble calcium car- bonate generated from chemical reaction between carbon dioxide and Ca2＋ in formation water
出处
《重庆科技学院学报（自然科学版）》
CAS
2018年第1期31-34,共4页
Journal of Chongqing University of Science and Technology：Natural Sciences Edition
基金
国家自然科学基金-石油化工联合基金项目"页岩气低成本高效钻完井技术基础研究"(U1262209)
关键词
液态CO2
饱和地层水
渗透率损害
微观分析
liquid carbon dioxide
saturated formation water
permeability damage
microscopic analysis
