中国石油大学学报（自然科学版）2017，Vol.41Issue(6)：101-107,7.DOI:10.3969/j.issn.1673-5005.2017.06.012
超临界CO2钻井井筒流动规律
Study on wellbore flow field of supercritical carbon dioxide drilling
摘要
Abstract
A wellbore circulation flow model was proposed to couple calculate and analyze the flow field pressure parameter, temperature parameter and physical parameter of CO2 , in consideration of the influence of the axial heat transfer and the tem-perature change of sidewall rocks on the flow field. The results show that CO2 turns into supercritical state at the depth of 780 m in the tubing and it maintains the supercritical state in the annulus under experimental conditions. The pressure in the an-nulus is approximately in linear correlation with depth. The pressure change of CO2 is 36. 7 % smaller than that of water. In the tubing, the temperature change dominates the changes of properties of CO2 . However, the pressure change becomes the dominating factor in the annulus. The Reynolds number is as high as 106 in the annulus, which is in violent turbulence. The supercritical CO2 drilling shows advantages in the exploitation of reservoirs with narrow pressure windows.关键词
超临界CO2/井筒流动/传热/压力剖面/雷诺数Key words
supercritical CO2/wellbore flow/heat transfer/pressure profile/Reynolds number分类
能源科技引用本文复制引用
宋维强,倪红坚,景英华,王瑞和,沈忠厚,李斌..超临界CO2钻井井筒流动规律[J].中国石油大学学报（自然科学版）,2017,41(6):101-107,7.基金项目
国家"973"重大专项(2014CB239202) （2014CB239202）
国家博士后基金项目(2017m622315) （2017m622315）
国家自然科学基金项目(51504281) （51504281）
山东省自然科学基金项目(ZR201709190087) （ZR201709190087）
