Study of CO₂ Injection into Sumatran Shale Layers to increase Hydrocarbon Gas Productivity of The Shale Gas Reservoir

Injecting CO 2 into a reservoir has some important reasons. CO 2 injection can enhance oil and gas recovery by reducing the capillary pressure, increasing the pressure gradient, and changing the phase behavior of the fluids. It can reduce greenhouse gas emissions by capturing and storing CO 2 underground. It can also create economic benefits by utilizing CO 2 as a valuable resource and generating revenue from carbon credits. Therefore, injecting CO 2 into a reservoir benefits the environment and the industry. We can inject CO 2 in shale gas reservoirs to increase productivity because CO 2 has a stronger adsorption capacity on shale surfaces than hydrocarbon gas. When CO 2 is injected into shale reservoirs, it can displace the adsorbed CH 4 flow out of the micropores and free up more space for gas flow. Injecting CO 2 can also reduce the viscosity and density of shale gas, improving its mobility and transport. Moreover, injecting CO 2 can provide environmental benefits by reducing carbon emissions and storing CO 2 underground. Therefore, CO 2 injection is a promising technique for enhancing shale gas recovery and mitigating climate change. We characterized several types of shale from Sumatra using XRD to determine the mineral content. We injected the shale sample with the inert gas and CO 2 gas. The characteristics of pressure build up after CO 2 injection seem lower than one after inert gas injection. The volumetric of released gas after injection shows the same phenomena as pressure build up’s phenomena which shows clearly that shale rock released less of CO 2 gas than the one of inert gas (CH 4 ). These phenomena show that the CH 4 can be released easier than the CO2 in the shale rock. Therefore, CO 2 can be utilized as material for enhancing the gas recovery in shale reservoir.