DescriptionThe porous system, combined with a hydrate promoter (SDS/Amino Acid (AA)) can be used to accelerate the methane hydrate formation in the marine sediment environment. Temperature and/or Pressure play the most crucial role during methane hydrate formation. Methane production from artificial methane hydrate can be facilitated by injecting CO2 rich gas. Swapping leads to low methane recovery and small CO2 storage. The final product after swapping is mixed CH4/CO2 hydrate and pure CH4/CO2 hydrate. Water activity in pores is very low which controls the kinetics of hydrate formation and reformation within the pore space. By adding the kinetic hydrate promoter in water, water activity can be enhanced either by reducing the surface tension or improving the hydrogen bonding ability. We hypothesize that change in water activity can play a crucial role during the CO2 rich gas injection into methane gas hydrate. Pore water available can form CO2 hydrate as well as pore water available due to methane hydrate or mixed hydrate dissociation would reform the CO2 hydrate available in the system. We would be testing this assumption during the stepwise pressure reduction method after injecting CO2 rich gas into methane hydrate. This study investigates the swapping in the marine environment using a high-pressure cell followed by gas chromatography. Methane hydrate is formed using unconsolidated silica sand in the presence of promoters. The percentage of methane hydrate established will be quantified. Methane hydrate formation will be followed by a swapping procedure applied to the already formed methane hydrate by injecting pure CO2 and enriched CO2 mixture. Swapping would lead to the creation of mixed hydrates as well as pure CO2 hydrate besides existing methane hydrate. Additional methane production will be facilitated with stepwise pressure reduction between methane and CO2 equilibrium pressure such that methane hydrate dissociation leads to CO2 hydrate reformation released from, mixed hydrate dissociation. Gas samples at regular intervals will be collected for GC analysis to study the molar composition of CH4 & CO2 in the vapor phase. The objective of the study include: • To study the effect of promoter during the hydrate swapping in unconsolidated sand • To study the effect of initial fluid saturation in methane recovery and CO2 storage potential. • To study the effect of the porous system and the promoter effect on gas hydrate saturation, methane recovery, and CO2 storage potential • To study the effect of injection gas, stepwise pressure reduction technique on methane production, and additional CO2 storage.
|Period||3 Feb 2020 → 25 Sep 2020|
|Examination held at||CERE – Center for Energy Ressources Engineering|
|Degree of Recognition||Local|
Research output: Contribution to journal › Journal article › Research › peer-review