نوع مقاله : مقاله پژوهشی
عنوان مقاله English
نویسندگان English
The amount of methane stored in global natural hydrate resources is estimated to be more than twice the total global conventional oil and gas reserves, however recovering energy from this potential resource has proven to be very challenging. The fundamental challenges of gas hydrate dissociation through various approaches are not yet fully understood. In this study, methane gas recovery, water production characteristics and thermal responses of the system under a depressurization approach of 4.6 MPa for a sample of hydrate-containing siliceous sediments with targeted saturation (SH:33%, SA:64%, SG:3%) and methane conversion fraction of 89.2% in a 1-liter crystallizer and at a formation temperature of 279.2 K were investigated. In this study, we found that energy recovery under limited depressurization resulted in slow and incomplete methane hydrate dissociation and intermittent water and gas production behavior. The findings of this study showed that the kinetics of methane hydrate dissociation in low-temperature sedimentary environments with a limited depressurization approach can be affected by stability conditions, which will also lead to the possibility of disruption in the propagation of the depressurization front. Due to the possibility of separating fluids resulting from hydrate dissociation within the crystallizer during depressurization, significantly less water was produced in the first ten hours. The study of the kinetics of methane hydrate formation and dissociation in this study can provide valuable information for analyzing long-term economic production and assessing the life cycle of gas production from hydrate reservoirs.
کلیدواژهها English