Analysis for temperature and pressure fields in process of hydrate dissociation by depressurization

• Published in: International Journal for Numerical and Analytical Methods in Geomechanics
• Main Authors: 赵振伟, Shang XC
• Format: Article in Journal/Newspaper
• Language: English
• Published: 2010
• Subjects: Semi-analytic Solution; Gas Hydrate; Free Boundary Value Problem; Dissociation; Depressurization; Natural-gas Production; Methane Hydrate; Engineering; Materials Science; Mechanics; Geological; Multidisciplinary; decompression; natural gas production; 离解; sprays; atomisation; coulomb explosion; dehydration (chemical reactions); deprotonation; dissociative attachment; dissociative recombination; molecular dissociation; electron attachment; positron attachment; photodissociation; pressure reduction; bleed-off; deflating; 泄压; Methane hydrate
• Online Access: http://dspace.imech.ac.cn/handle/311007/43593; http://onlinelibrary.wiley.com/doi/10.1002/nag.882/abstract; https://doi.org/10.1002/nag.882

An improved axisymmetric mathematic modeling is proposed for the process of hydrate dissociation by depressurization around vertical well. To reckon in the effect of latent heat of gas hydrate at the decomposition front, the energy balance equation is employed. The semi-analytic solutions for temperature and pressure fields are obtained by using Boltzmann-transformation. The location of decomposition front is determined by solving initial value problem for system of ordinary differential equations. The distributions of pressure and temperature along horizontal radiate in the reservoir are calculated. The numeric results indicate that the moving speed of decomposition front is sensitively dependent on the well pressure and the sediment permeability. Copyright (C) 2010 John Wiley & Sons, Ltd.