Abstract
Shale gas is one of the unconventional gas reservoirs with high potential in the future. One of challenges of shale gas extraction is most of the gas remains adsorbed in the shale reservoirs Thus, the production of adsorbed gas is very difficult to extract. The purpose of this project is to carry out a comparative analysis on the effect of various surfactants consisting of anionic, cationic, nonionic, and amphoteric surfactants for increasing the productivity of shale gas recovery. This study is based on experimental methodology. Surfactant plays an important role in IFT reduction and changing wettability, thus increasing the gas production. This study has been carried out by using BET machine in order to obtain methane adsorption and desorption isotherm. So, the results of methane adsorption and desorption isotherm without surfactant and with various surfactants were compared. Although the results of adsorption and desorption isotherm after injecting different types of surfactant do not go along with expected trend, adsorption can be decreased since surfactants can encourage methane gas to be desorbed. Anionic, cationic, and amphoteric surfactants can change wettability in shale gas that increases gas adsorption. Amphoteric surfactant can improve the adsorption isotherm of methane gas most effectively; thus, the productivity of shale gas recovery will be maximized.
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