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J-55 P-110 Figure 3.1. Preliminary Wellbore Configurations Assessed for Capacity Scaling and Site Screening Based on the storage pressure, air injection simulations were completed for both casing grades, assuming a 12-hour off-peak compression period and holding the wellhead pressure limit at the minimum internal yield pressure (MIYP). Initial modeling used a multi-stage centrifugal compressor, compressing ambient air up to the MIYP for each respective casing grade, and evaluated the energetics required for compression. Based on these bounding parameters, a single well with J-55 casing could store a total of approximately 9,000 kg of compressed air consuming about 1,700 kWh. The higher grade P-110 (41#/ft) could store approximately 30,000 kg of compressed air, and was modeled to consume about 4,000 kWh. The capacity assessment discussed above suggests higher-grade casing strings might be preferable if repurposing for compressed air storage. Though both casing grades evaluated could provide significant capacity and energy, developed fields with a significant number of wells per square mile could readily accommodate a range of hybrid GT-CAES projects even with the more common, lower-grade casing. Where only a few wells are available locally, this application might lend itself to site-level storage when coupled with a relatively small slipstream of geothermal fluid. For the purposes of modeling grid- scale storage, these initial single-well simulations were used to define the range of wells needed to provide at least a 10-MW storage facility (considered to represent commercially significant capacity), and to inform siting decisions for the case study presented below. 12PDF Image | Geothermally Well Based Compressed Air Energy Storage
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