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考虑CO效应的酸液滤失模型及其应用
石油实验地质
2015年 37卷 第S1期
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Title
Acid filtration model considering CO effect and its application
Authors
Li Chunyue
Li Yongming
单位
中国石化西北油田分公司工程技术研究院, 乌鲁木齐 830011
2. 西南石油大学, 成都 610500
Organization
Research Institute of Engineering Technology, SINOPEC Northwest Company, Urumqi, Xinjiang 830011, China
2. Southwest Petroleum University, Chengdu, Sichuan 610500, China
摘要
碳酸盐岩储层酸压施工过程中,酸岩反应生成CO2。为研究CO2对酸液滤失的影响,确定游离态CO2的体积,在常规酸液滤失模型的基础上建立了考虑CO2效应的酸液滤失模型。通过计算分析,得到游离态CO2体积对酸蚀蚓孔发育和酸液滤失的影响。模拟分析表明,游离态CO2的体积随着酸液浓度增加而增加,随缝内压力上升而减少;存在游离态CO2的情况下,酸蚀裂缝中流体的滤失规律与泡沫压裂液或泡沫酸的滤失规律相同,随着CO2体积分数增加,酸液滤失量减少,而酸蚀蚓孔半径也相应变小。
Abstract
CO2 generates in the course of acidizing treatment with the reaction of acid and rock, which will influence the mechanism of acid leaking. An acid filtration model considering CO2 effect has been set up based on the conventional acid filtration model in order to study the CO2 effect on acid liquid loss and to determine the volume of free CO2. Simulation results showed that the volume of free CO2 increases with increasing acid concentration and decreases with increasing pressure. In acid corrosion fractures, when free CO2 exists, filtration law is the same as foam fracturing, and the volume of acid fluid loss reduces with increasing CO2 volume.
关键词：
酸压;
酸液滤失;
滤失机理;
CO2 效应;
碳酸盐岩储层;
Keywords:
acid fracturing;
acid fluid loss;
leak-off mechanism;
CO2 effect;
carbonate reservoir;
基金项目
国家科技重大专项课题"缝洞型碳酸盐岩油藏高效酸压改造技术"(2011ZX05014-006)资助。
DOI
https://doi.org/10.11781/sysydz2015S1118
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