摘要
以东营组实钻岩屑为例,采用模拟试验装置考察井下二氧化碳对岩屑分散机制,并进行岩屑XRD矿物成分和反应液离子成分分析。结果表明:二氧化碳对岩屑粒径影响甚微,地层水长时间浸泡会使岩屑粒径变小,地层水与二氧化碳共存时,岩屑平均粒径先急剧减小,后渐趋稳定,随着温度和压力的升高,岩屑平均粒径逐渐减小;地层水和二氧化碳共存时,东营组岩屑粒径变化的主要是由于二氧化碳促进了岩屑中的黏土矿物分散,缩短了黏土矿物的水化反应时间,同时二氧化碳与水反应生成碳酸,溶解了岩屑中的部分胶结矿物,促进了岩屑粒径的减小。
The cuttings from Dongying Formation were chosen to study the dispersion mechanism of CO2on cuttings at the bottom hole using a simulated device. The XRD mineral compositions and ion types in reaction solution were analyzed as well. The results show that the influence of CO2on the particle size of cuttings is little. After long time soaking in the formation water, the particle size of the cuttings would be smaller. Under the circumstance of the mixture of CO2and formation water,the average particle size of the cuttings decreases sharply at first,and then it becomes stable gradually. With the increase of the temperature and the pressure,the average size would decrease accordingly. With the coexistence of formation water and CO2,the change of the particle size for the cuttings in Dongying Formation is caused by the clay mineral dispersion in the cuttings,which is boosted by CO2. Also,CO2reduces the hydration reaction time of the clay. At the same time,carbonic acid is formed by the reaction of CO2and H2O,which resolves part clay in the cuttings and accelerates the reduction of the average particle size.
出处
《中国石油大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2014年第2期82-85,共4页
Journal of China University of Petroleum(Edition of Natural Science)
基金
国家自然科学基金重点项目(51034007)
国家'973'计划项目(2010CB226703
2014CB239202)
山东省自然科学基金项目(ZR2011EEZ003)
关键词
二氧化碳
水
岩屑
粒径
试验
carbon dioxide
water
cuttings
particle size
experiment
