NUMERICAL SIMULATION ON CARBON DIOXIDE STORAGE IN SAN SAI AREA, FANG BASIN

Abstract

The purpose of this work is to study the CO2 storage in depleted oilfield with simulation and anticipate the movement of CO2 in depleted oilfield at San Sai structure, Fang basin to collect a preliminary data. The data used in the simulation model come from Northern Petroleum Development Center, Defence Energy Department, Ministry of Defence. CMG program is used to create carbon storage model. The defined variable in modeling include depth between 800-3000 m., injection rate at 1000, 2000 and 4000 tons/day. The time this study from 1, 5, 10, 20 and 50 years. The simulation applies Local Grid Refinement (LGR) and separates case study into 4 cases as CO2 storage at second, fourth, sixth and overall layers. Pressure buildup and radius of migration are investigated. From results, it is obvious the pressure buildup from CO2 injection until shutin preiod. The pressure is still lower the maximum pressure. For 2000 and 4000 tons/day pressure buildup and decrease unlike that of 1000 tons/day injection rate. Furthermore, radius of migration of CO2 will increase until shutin well preiod the radius will been slightly decreased. The simulation makes it possible to predict what will happen by the period. The depth will influence the amount of storage, thickness of caprock effect the CO2 leakage into the surface, the injection rate and the pressure buildup are related.