CCS and Power Systems
Carbon Storage - Geologic Storage Technologies and Simulation and Risk Assessment
Systematic Assessment of Wellbore Integrity for Geologic Carbon Storage Projects Using Regulatory and Industry Information
Performer: Battelle Memorial Institute
Project No: FE0009367
Safe and effective storage of CO2 and compliance with regulatory protocols requires an understanding of existing wellbores that could be potential leakage pathways. Wellbore integrity is a key risk factor for carbon capture and storage (CCS) applications. Wells (existing and new) may present risks for CO2 geologic storage, including wells which underwent poor cementing and plugging processes, or had incomplete records. This project will help address these risks through completion of a systematic assessment of wellbore integrity using regulatory and industry information/data.
The project will determine the distribution of wellbores in a study area that includes the Appalachian and Michigan Basins, with a more detailed focus on northeastern Ohio and neighboring areas of Pennsylvania and southern Michigan (Figure 1). The project team will compile and sort all pertinent data obtained from state or industry databases for the large number of wells in the study area. These data will be reviewed, categorized, and statistically analyzed using factors such as well age, geologic setting (including potential exposure to CO2, especially in some shale gas wells), construction materials, test and operation data, and well remediation history. Screening criteria will be used to develop a short-list of oil/gas, gas storage, or injection wells for a detailed assessment of well history and to collect sustained casing pressure and mechanical integrity test data. The combined data will be used to evaluate the risk of well failure with regard to meeting injection regulations, development of remediation plans, and financial impact on projects.