Quantitative Investigation and Simulation of CO2 Sequestration in Petroleum Reservoirs Aquifer

Generation and emission of greenhouse gases in air has caused climate changes and global heating. So, it is really important to reduce greenhouse gases generation or to dispose them. Injection of CO2 in hydrocarbon formations in order to EOR in depleted oil and gas reservoirs and in aquifers is one of the disposal ways.

In this project using commercial simulator CO2 Sequestration in an oil reservoir aquifer has been simulated in compositional way. Reservoir connected aquifer has been simulated using Fetkovich model and injection wells are completed in aquifer section. Simulation has been performed under four different scenarios in vertical and horizontal wells.

CO2 injection and storage in aquifer are possible in different cases like free gas, sequestrated (entrapped) gas, gas solved in water and storage as solid minerals that with regards the conditions in this study, entrapped gas and free gas were resultful.

Results show better potential for this end for horizontal wells than vertical wells, which two horizontal (3.3e+11 sm3) wells or six vertical wells (6.9e+11) are required to inject and store specified volume of CO2 and due to the importance of well completion and durability of gas in reservoir, down completion is suggested.