Description

The CPT200 is a crucial instrument for assessing the seal integrity of underground hydrogen storage reservoirs. It determines the minimum pressure required for hydrogen to displace resident fluids (e.g., brine) within the caprock’s pore structure, ensuring that the seal remains effective under storage conditions. Conducted on low-permeability rocks like shale, claystone, or anhydrite, the test involves gradually increasing hydrogen or nitrogen injection pressure until gas breakthrough occurs. This threshold pressure is influenced by pore throat size, wettability, and rock compaction, with higher values indicating a more effective seal against hydrogen migration. By defining maximum safe storage pressures, the test helps prevent hydrogen leakage, ensuring long-term containment stability and guiding the selection of suitable geological formations for hydrogen storage.