二氧化碳地质存储过程中沿井筒渗漏定性分析

二氧化碳沿井筒渗漏是二氧化碳地质埋存过程中所面临的重要风险之一.尤其是对于已经封堵的废弃井,由于获取井下的信息比较困难,因此评价废弃井的完整性是一个比较大的挑战.本文为评估二氧化碳沿废弃井渗漏提出了风险分析的方法.该方法包括了三个主要步骤:渗漏方案的制定,定量模拟及结果分析.所制定的渗漏方案将通过数值模拟进行定量分析及评价.本文将阐述该评价方法的第一步骤:渗漏方案的制定.该步骤为渗漏的定量模拟提供了理论基础.该方法被广泛接受并现场应用于德国某大型二氧化碳存储及提高天然气采收率项目中.

A Qualitative Analysis of CO2 Leakage along Abandoned Well during CO2 Sequestration

CO2 leakage along abandoned well is one of the big risks during the process of CO2 sequestration. Especially for these abandoned and plugged wells, the availability of data is difficult, therefore well integrity evaluation for old abandoned well is a big challenge. This paper will introduce a novel risk assessment method to evaluate well integrity in CO2 Sequestration (CCS) areas. This method consists of three main steps, which are scenarios development, model development, and consequence analysis. In this paper the focus will be on the first step "FEPs and scenarios development". This method has been accepted and applied in one CCS and EGR project in a depleted gas field in Germany.