Sensitivity analysis of methane hydrate bearing Class 3 reservoirs during thermal injection

Recent Advances in Methods of Gas Recovery from Hydrate-Bearing Sediments: A Review

“…On the basis of the combination of thermal fluid and well configuration, the traditional injection method of thermal fluid is ordinarily compartmentalized into the huff and puff method (HP) , and thermal flooding through multiple-well (MTF). , HP, comprising three stages of injection of heat fluid, soaking, and the production cycle, mainly increases the temperature in the vicinity of the wellbore to trigger the NGH dissociation in HBS. That is, the injected heat is forced to completely transfer inside HBS through the soaking cycle as possible, thereby improving the heat utilization, but the high-pressure environment may make the porous media more vulnerable to observe the NGH reformation during soaking. , Also, the repeated intersection of high and low pressure in the cycle of soaking and production can easily cause serious sand production and introduce security and stability risks of the area, mainly around the wellbore. In MTF, the thermal fluid is injected and forced to progress from the injection well to the production well to provoke the NGH dissociation in the middle area between two wells, mainly by the dual heat transfer effects of heat conduction and heat convection. , The stability of gas production using the traditional injection method of thermal fluid is primarily controlled by factors such as the injection temperature, salinity and injection rate of thermal fluid, thermal properties in HBS, absolute permeability of HBS, NGH saturation, and others. , Generally, the gas production rate and EER all increase with the temperature of the injected fluid, but the improved process and improved effect drop for the latter indicator when this temperature continues to increase to a specific range arising out of the ineluctable heat loss. , And the function of EER and the injection temperature can be expressed as eq .…”

“…That is, the injected heat is forced to completely transfer inside HBS through the soaking cycle as possible, thereby improving the heat utilization, but the highpressure environment may make the porous media more vulnerable to observe the NGH reformation during soaking. 162,166 Also, the repeated intersection of high and low pressure in the cycle of soaking and production can easily cause serious sand production and introduce security and stability risks of the area, mainly around the wellbore. In MTF, the thermal fluid is injected and forced to progress from the injection well to the production well to provoke the NGH dissociation in the middle area between two wells, mainly by the dual heat transfer effects of heat conduction and heat convection.…”

Transformation of Diffusion and Local Structure of CH4, CO2, SO2 and H2O Mixtures in Graphene Under Wide Temperature and Pressure Range: A Molecular Dynamics Simulation Study

“…By destroying the phase equilibrium condition of NGHs, various methods have been developed for the decomposition and production of natural gas, including the depressionlowering method, [12][13][14][15][16] heat injection method, [17][18][19][20] and chemical inhibitor injection method. [21][22][23][24] However, these techniques are expensive and affect the mechanical stability of hydrate reservoirs, leading to geological disasters and environmental pollution.…”

Feasibility Evaluation of a New Approach of Seawater Flooding for Offshore Natural Gas Hydrate Exploitation

“…Liu et al 32 proposed a novel staged production method involving a horizontal production well and a vertical hot water injection well to promote gas recovery from NGH deposits. Vishal et al 33 and Lall et al 34 made a comparison of the effects of thermal injection and huff-and-puff method in a class 3 heterogeneous NGH reservoir. Zhao et al 35 employed a low-frequency electric heating technology for class 1 NGH deposits.…”