Abandonment process for injection well of China's Shenhua carbon dioxide geological storage demonstration project

Qi Li, Xiaying Li, Dongqin Kuang, Zhiyong Niu, Xiaochun Li, Xutao Lu, Jianli Ma and Xiaochen Wei

Greenhouse Gases: Science and Technology, 2017, vol. 7, issue 5, 903-914

Abstract: The abandonment process is a highly important part of project management for CO 2 capture and storage (CCS) projects. For the first full procedure of a CO 2 geological storage demonstration project in a deep saline aquifer in China, this paper describes the abandonment process of a CO 2 operating well. The key idea that we advance is that wellbore integrity tests should be conducted before the abandonment, and consideration must be given to the CO 2 corrosion resistance materials, the design method of sealing the plugs, monitoring tests (such as pressure tests), and the use of a long‐term monitoring system (such as the original pressure test and a packer isolation test every year). According to Chinese regulations and related experience in the oil and gas industry, the factors chosen are the pressure factor, cap rock, potable water layer, unexploited resource layer, suspected leak path, perforated zone, productive hydrocarbon zone without perforation, and water‐injection and waste‐water treatment layers. We intuitively evaluate and quantify the plugged zones using the modified analytical hierarchy process (M‐AHP) method to determine the positions of the plugs. Next, referring to the Chinese regulations on Well abandonment and inactive well practices, the last plug located in the Quaternary strata is compulsorily ensured, and the length of all plugs is also determined. Finally, the paper summarizes the methodology and presents suggestions for the abandonment process of the Shenhua CCS project. © 2017 Society of Chemical Industry and John Wiley & Sons, Ltd.

Date: 2017
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