SENSITIVITY ANALYSIS FOR OPTIMIZING CO_2 INJECTION TO IMPROVE ENHANCED COALBED METHANE RECOVERY AND CO_2 STORAGE CAPACITY

摘要

Carbon dioxide (CO_2) injection in deep unmineable coal seams can enhance coalbed methane (CBM) recovery as well as effectively and permanently store the CO_2. Enhanced coalbed methane (ECBM) recovery and CO_2 storage capacity can be improved by altering injection parameters including the injection well locations, number of injection wells, and the time and rate of the injection. A sensitivity study was performed with sixteen different injection scenarios on a coalbed methane field in Buchanan County, Virginia to understand the influence of the injection parameters on methane production, CO_2 storage and the extent of the CO_2 plume. History matching was done for the gas and water production period prior to injection based on field data from an active US Department of Energy funded pilot project.