气体示踪表征CO_2驱渗流特征实验研究  

The Experiment Study of Using Gas Tracer on Analysis the Mechanism of CO_2 Flooding

作　　者：郭文敏[1,2] 李治平[1] 吕爱华[2] 万国赋[2] 

机构地区：[1]中国地质大学(北京)能源学院,北京海淀100083 [2]常州大学石油工程学院,江苏常州213016

出　　处：《西南石油大学学报（自然科学版）》2015年第1期111-115,共5页Journal of Southwest Petroleum University(Science & Technology Edition)

基　　金：国家重大科技专项(2009ZX05009006);中国石油科技创新基金(2009D50060201)

摘　　要：为描述地下CO2驱渗流机理及混相/非混相驱替特征,选取SF6作为CO2驱气体示踪剂,利用气体示踪响应曲线解释原理,从示踪剂曲线的注入体积、曲线峰值、峰宽、药剂回采率及后续曲线预测等角度,描述CO2在混相/非混相驱状态下的驱替特征。结果表明:CO2在混相/非混相驱状态下示踪剂响应曲线不同,示踪剂见剂峰值浓度对应PV数越小、峰宽越小、回采率越低、预测模型系数越小,则CO2混相驱特征越明显,反之为非混相驱替特征,而非混相特征的出现,将加速CO2与原油的两相分离,降低驱油效率。CO2驱油过程示踪监测对于掌握CO2地下渗流状态,提高驱油效果具有极为重要的矿场指导意义。In order to describe the characters of the miscible and immiscible CO2 flooding, the SF6 is chosen as the gas tracer. According to the principle of tracer response, several parameters like PV, peak value of curve, the width of curve, the recovery rate of tracer and the forecasting of curve were taken into the description of the character of the miscible and immiscible CO2 flooding. The result in this paper illustrated that the curves of the tracer are different between miscible and immiscible driving. The tracer curve of miscible driving shows narrower the hump is, the lower recovery of the tracer, the smaller the forecasting coefficient. On the contrary, in immiscible CO2 flooding, oil and gas will be separated and the recovery rate ofoil will decrease sharply. So, the flooding states can be detected by monitoring the gas tracer during CO2 flooding and the findings will improve the recovery rate of oil.

关 键 词：CO2 SF6 混相/非混相驱 气体示踪剂 响应曲线 

分 类 号：TE331[石油与天然气工程—油气田开发工程]