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3.0 Utilizing Wells for Compressed Air Storage To assess the degree to which steel well casing could be used for compressed air storage, and the pressures and mass flow rates associated with such an approach, a generalized analysis of several representative casing grades was undertaken. This enabled the development of assumptions regarding the number of repurposed wells that would be required to support auxiliary power generation from a single geothermal production well, assuming the casing grades would be predominant in the well field. 3.1 Capacity and Scalability of Well-Based CAES The preliminary analysis of steel casing grades was used to determine the number of repurposed wells required for air storage to provide a project of meaningful size. There are hundreds of combinations of steel grade, thickness, and diameter casing available from manufacturers. Because the goal of this effort was to better understand the range of storage capacities associated with the range of casing types most likely to be encountered in existing, developed fields, a lower- and higher-grade steel (J-55 and P-110, respectively) were selected to evaluate the impact of casing grade on maximum allowable air pressure for storage, total air mass per well, total compressor power consumption, and potential mass flow rate impacts on extraction turbine operations. Two cases were modeled (Figure 3.1) assuming a total casing depth of 5,000 ft using American Petroleum Institute (API) specifications for 7-inch (OD) casing for J-55 (6.46-inch ID); and P-110 (5.82- inch ID) steel grades, and performance properties (API 1982). Considering only the material strength of the single casing, and neglecting containment provided by additional cement, larger-diameter outer casing(s) or the host rock itself, J-55 casing can support pressures of up to 3,740 psig at the wellhead; the P-110 casing increases more than four-fold to 16,225 psig at the wellhead. 11PDF Image | Geothermally Well Based Compressed Air Energy Storage
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