Master Thesis: Multistage CH4-CO2 Swapping in Porous Medium

Description

Methane gas (CH4) hydrate reserves are considered potential source of clean energy. CO2 rich gas injection into these reservoirs is considered as potential method to store CO2 and produced methane gas simultaneously. This technique success depends on the thermodynamic stability difference between methane and CO2 hydrate and final product is mixed CH4-CO2 hydrates. Presence and extent of mixed hydrate could decide the commercial success of this method. In this study, we test multistage technique to inject CO2 rich gas into methane hydrate in sedimentary rock to study the recovery of the methane gas and enhance CO2 storage potential. Multistage technique is described as multiple CO2 rich gas injection at different injection pressure combined with pressure depletion. Injection of CO2 rich gas would form CO2 hydrate first which release energy to be used in melting the CH4 hydrate. Kinetics of this reaction depends on the availability of pore water as well as difference in equilibrium pressure and injection pressure. Temperature and hydrate saturation are also important factor. During the investigation, series of experiments will be carried out using the core flooding setup develop in house to study the methane recovery and CO2 storage potential. Data related to pressure, temperature, resistance will be recorded to investigate the following. • To study the effect of methane hydrate saturation on CH4 recovery and CO2 storage. • To study the effect of experimental temperature above and below the ice melting to study the effect of ice saturation • To study the effect of pore water pressure (difference between injection and confining pressure) on the methane recovery • To study the dissociation behavior of swapped hydrate under self-preservation

Period	3 Feb 2020 → 14 Sept 2020
Examinee	Saad Khan
Examination held at	CERE – Center for Energy Ressources Engineering
Degree of Recognition	Local