Evaluation of gas production from methane hydrates using depressurization, thermal stimulation and combined methods

Investigation into optimization condition of thermal stimulation for hydrate dissociation in the sandy reservoir

“…Here, the calculation method of the final temperature of the dissociated water is similar to that in Eq. (14). Hence, the entropy production of the dissociated water is calculated as the following equation:…”

“…Here, the calculation methods of T 0 and T 2 are the same to the method described in Eq. (14). Entropy production of the environment is calculated as the amount of heat transfer between the system and the surrounding environment (Q env ) divides by the absolute temperature of the environment.…”

“…To make the utilization of this resource economically viable, it is imperative to exploit the gas from the hydrate reservoir effectively and safely. The major potential methods for producing gas from hydrates are depressurization [11][12][13], thermal stimulation [14][15][16][17][18], inhibitor stimulation [19][20][21][22], and carbon dioxide replacement [23][24][25]. The depressurization is considered as the most economically feasible and the least energy intensive method.…”

Energy from Waste Materials and Unconventional Sources

“…Natural gas hydrate is a vast energy resource with global distribution in permafrost regions and in the oceans that it can be evaluated as a potential energy source (Feng et al 2015;Zhao et al 2015;Song et al 2015). Natural gas hydrates represent a potentially substantial unconventional natural gas resource and the recovery of permafrost hydrates has seen significant attention over the past decade (Fitzgerald and Castaldi 2013).…”

Experimental study on sediment deformation during methane hydrate decomposition in sandy and silty clay sediments with a novel experimental apparatus

“…To obtain better gas production rate and energy efficiency, Li et al [15] and Song et al [16], carried out a series of experiments with combined recovery methods, such as huff and puff in conjunction with depressurization, huff and puff with no soaking in sandy sediments and depressurization with heat stimulation. Furthermore, some experimental and numerical models were developed to study the production behaviors of different well spacing, which includes single horizontal well, dual horizontal wells and five-spot well system [17][18][19][20].…”