二氧化碳地质封存与利用工程废弃井技术的现状与进展

Status and Advances of Abandoned Process of Wells for CO_2 Geological Storage

随着二氧化碳(CO_2)地质封存(CCS)与利用(CCUS)相关工程的快速进展,CO_2封存场地的废弃井能否有效地封堵残余的CO_2成为一项亟待解决的课题。目前,国内外在油气领域的废弃井作业已经有具体成熟的技术和丰富的经验,但是在CCS/CCUS领域,针对CO_2作业井(包括CO_2注入井和CO_2监测井)的废弃作业国际上仅有少量公开实例,国内尚为空白。首先,总结国外发达国家(荷兰、美国和加拿大等)关于CO_2作业井废弃所需的要求、材料以及实例经验中的监测要求;其次,归纳国内油气行业废弃井作业的技术现状;最后,总结CO_2作业井废弃作业与常规废弃井作业的不同之处,并提出未来CO_2作业井废弃作业建议。该研究对即将封井的神华CCS示范项目的废弃作业具有重要意义。

With the rapid development of CO_2 geological storage and utilization（ CCS / CCUS）,the abandoned well in the sites of CCS / CCUS projects is becoming an important subject to be solved to check whether it can effectively block the residual CO_2 or not. Up to now,the abandoned process of wells in the field of oil and gas in China and abroad have gained mature operation technology and rich experience. However,in the field of CCS / CCUS,there is only a small number of global public instances about the abandoned process of operational wells of CO_2 including CO_2injection wells and CO_2 monitoring wells,and the domestic instance is still blank. In this paper,we firstly summarized the required demands,materials,cases of operational experiences,and monitoring requirements of the abandoned process of operational wells of CO_2 in the developed countries,e. g. the Netherlands,the United States and Canada. Then,we figured out the status of the abandoned process of domestic wells in oil and gas industry. Finally,we concluded the differences of the abandoned process between operational wells of CO_2 and traditional wells of oil and gas,and proposed some recommendations for the abandoned process of operational wells of CO_2 in the current and future CCS / CCUS projects in China. This study has important implications for the upcoming abandoned process of all the operational wells at Shenhua CCS demonstration site in 2016.