A Geomechanical Stability Model Analysis of Hydrate Reservoir for Gas Hydrate Production by Depressurization

CHENG Jia-wang; SU Zheng; WU Neng-you

doi:10.3969/j.issn.2095-560X.2016.01.006

Advances in New and Renewable Energy >

2016 , Vol. 4 >Issue 1: 33 - 41

DOI: https://doi.org/10.3969/j.issn.2095-560X.2016.01.006

A Geomechanical Stability Model Analysis of Hydrate Reservoir for Gas Hydrate Production by Depressurization

CHENG Jia-wang ,
SU Zheng ,
WU Neng-you

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Received date: 2015-09-16

Revised date: 2015-12-24

Online published: 2016-02-28

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Abstract

A model based on the dynamics of fluids in porous media and poroelasticity is developed for analyzing geomechanical stability of hydrate reservoir, which is a challenge for commercial gas production from hydrate reservoir. This model, including subsidence of hydrate reservoir and wellbore stability, is applied to Gulf of Mexico, where the basic parameters and the in situ stresses are publicly published. It is concluded that subsidence of hydrate reservoir occurs due to the changes in pore pressure and the maximum subsidence occurs near the wellbore; the more hydrates decompose, the larger subsidence occurs. Decreasing well pressure will induce potential wellbore failure and the borehole failure is expected to initiate at those positions where the tangential and vertical stresses reach the maximum value. The horizontal stress contrast increases the instability of wellbore.

Key words： natural gas hydrate; depressurization; subsidence; wellbore stability

Cite this article

CHENG Jia-wang , SU Zheng , WU Neng-you . A Geomechanical Stability Model Analysis of Hydrate Reservoir for Gas Hydrate Production by Depressurization[J]. Advances in New and Renewable Energy, 2016 , 4(1) : 33 -41 . DOI: 10.3969/j.issn.2095-560X.2016.01.006

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