Study of CO2 injection into Sumatran shale layers to increase gas production of the shale gas field as well as effectiveness of gas carbon capture in the atmosphere
1Bagus Endar B. Nurhandoko, 2Erlangga Septama, 2Totong Kusnadi Usman, 2Pongga Dikdya Wardaya, 3Eko Bambang Supriyanto, 3Kaswandhi Triyoso, 3)Susilowati 1Ratih Pratiwi, 1Maria Cindrawati, 2Vida Irene Rosa, 2Richie R. Pratama

1)Physics Dept., Institut Teknologi Bandung
2)Upstream Research & Technology Innovation, Pertamina Persero
3)Rock Fluid Imaging Lab

Abstract

Injecting CO2 into a reservoir has some important reasons. CO2 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 the greenhouse gas emissions by capturing and storing CO2 underground. It can also create economic benefits by utilizing CO2 as a valuable resource and generating revenue from carbon credits. Therefore, injecting CO2 into a reservoir benefits the environment and the industry.
We can inject CO2 in shale gas reservoirs to increase productivity because CO2 has a stronger adsorption capacity on shale surfaces than hydrocarbon gas. When CO2 is injected into shale reservoirs, it can displace the adsorbed CH4 flow out of the micropores and free up more space for gas flow. Injecting CO2 can also reduce the viscosity and density of shale gas, improving its mobility and transport. Moreover, injecting CO2 can provide environmental benefits by reducing carbon emissions and storing CO2 underground. Therefore, CO2 injection is a promising technique for enhancing shale gas recovery and mitigating climate change.
In this study we characterized several types of shale from Sumatra using XRD to determine the mineral content, Scanning Electron Microscope to determine the pore structure and layers, EDX energy dispersion x-ray spectroscopy to determine the elemental content. We also measure the porosity of free gas from several Sumatran shales with helium gas for an analogy to the inert gas methane or other hydrocarbon gases. Adsorbed and desorbed porosity measurements were also carried out by hydrocarbon gas injection. This measurement is compared with CO2 gas injection measurements.
The results of adsorbed and desorbed porosity measurements of helium gas and CO2 gas for each type of shale show the effectiveness of Enhanced Gas Recovery in shale gas layers in Sumatra.

Keywords: CO2 injection, shale gas, enhance recovery, adsorbed porosity, desorbed porosity, mineralogy

Topic: Energy and Environmental Physics