A model for effective permeability in an unconsolidated hydrate reservoir

A Four-Phase Model for Methane Production from an Unconsolidated Hydrate Reservoir. Part 1. Model Development

“…These models have not consistently performed well when compared with production data. − While it is possible to obtain accurate model predictions via history matching using conventional approaches which assume a consolidated hydrate reservoir, ,, the concern is that if the semiempirical models are not rooted in the true physics of the reservoir, then the long-term production predictions will be unreliable. Detailed analysis of the Mallik production tests has demonstrated that soil failure and solid transport are crucial for accurate modeling of the gas and water production in unconsolidated hydrate reservoirs . Solid deformation in the reservoir has a substantial effect on the gas permeability such that neglecting these effects can result in orders of magnitude error in predicted gas production. − …”

“…Detailed analysis of the Mallik production tests has demonstrated that soil failure and solid transport are crucial for accurate modeling of the gas and water production in unconsolidated hydrate reservoirs . Solid deformation in the reservoir has a substantial effect on the gas permeability such that neglecting these effects can result in orders of magnitude error in predicted gas production. − …”

“…This involves development of constitutive models that can capture the change in solid normal stress and interparticle friction as load-bearing hydrate dissociates and the sand flows. The reduction of cohesive and solid frictional forces in unconsolidated hydrate-bearing sediment as hydrate dissociates is believed to result in acceleration of the rate of solid transport …”

Fully Coupled Numerical Model and Its Application in Natural Gas Hydrate Reservoir

“…Permeability, which means the ability of NGH reservoirs allowing gas and water to pass through can affect the multiphase seepage field and further influences the hydrate decomposition process. Hinz et al . established a model for effective permeability (gas, water, and sand three-phase) in an unconsolidated hydrate reservoir.…”

“…Permeability, which means the ability of NGH reservoirs allowing gas and water to pass through 24 can affect the multiphase seepage field 25 and further influences the hydrate decomposition process. Hinz et al 26 established a model for effective permeability (gas, water, and sand threephase) in an unconsolidated hydrate reservoir. Jiang et al 27 developed a 3D numerical model for gas production from hydrate reservoirs and conducted sensitivity studies using parameters including the initial hydrate reservoir pressure, initial reservoir temperature, and bottom-hole pressure.…”