CCS and Power Systems
Carbon Storage - Geologic Storage Technologies and Simulation and Risk Assessment
Proof of Feasibility of Using Well Bore Deformation as a Diagnostic Tool to Improve CO2 Sequestration
Performer: Clemson University
Project No: FE0004542
Researchers at Clemson University and its partners are evaluating the feasibility of using wellbore deformations to assess the changing conditions of geologic storage formations, confining zones, and well boreholes (Figure 1). Wellbores can deform in response to the injection or recovery of fluid. In extreme cases, the deformation is catastrophic and the well can be compromised. In routine cases, the small elastic deformation that accompanies injection or recovery has the potential to be an important diagnostic tool that can be used to improve the efficiency and safety of carbon storage. Wellbores can potentially deform during carbon storage operations, and effective monitoring of this process can be used to detect early precursors to fracturing within the injection formation, induced faulting, and failure of wellbore seals so they can be addressed before becoming catastrophic. These results will improve the characterization of geologic storage formations, confining zone compressibility, and pressure-dependent permeability, in addition to the distribution of structural deformation and other stratigraphic or structural differences in multiple geologic formation types. The results will improve well borehole characterization, including improvements in the understanding of the bond and integrity between the well casing, the cemented or grouted well annulus (the space between the well casing and the perimeter of the borehole), and the geologic formation itself.