CUED Publications database

Numerical analysis of wellbore behaviour during methane gas recovery from hydrate bearing sediments

Xu, E and Soga, K and Zhou, M and Uchida, S and Yamamoto, K (2014) Numerical analysis of wellbore behaviour during methane gas recovery from hydrate bearing sediments. In: UNSPECIFIED pp. 1448-1465..

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Abstract

Copyright 2014, Offshore Technology Conference. Japan Oil, Gas, and Metals National Corporation (JOGMEC) conducted the first offshore methane hydrate production trial on March 2013, in the eastern Nankai Trough, Japan. Field work for the gas production trial began in early 2012. Coring and logging operations were conducted to prepare for the gas hydrate production trial. On March 12th, 2013, JOGMEC succeeded in extracting methane gas from the hydrate-bearing sediments by the depressurization method and approximately 120, 000 cubic meters of methane gas were produced totally. The production finally terminated due to the increase in sand production. It indicates the importance of evaluation the state of wellbore in order to produce methane gas safety and efficiently. It calls for an analysis to predict the stress changes and plastic strain evolution of wellbore during the life of well. Hence, a wellbore model, specifically designed for methane gas production, is necessary to assess the potential risks associated with the construction and production stage. This paper describes a finite element approach, which mainly takes into account of (a) all the typical processes associated with wellbore construction and gas production and (b) the interaction between cement-casing-formation. Based on this approach, a finite element model, which includes the layered soil profile, cement, casing, gravel and sand screen, was developed in ABAQUS to simulate the gas production trial at East Nankai Trough in March, 2013. The Methane Hydrate Critical State (MHCS) model (Uchida et al., 2012), which was developed to simulate the geomechanical response of the methane hydrate bearing sediment, was incorporated into this finite element model. It presents results of coupled ground deformation and pore fluid flow analysis of a gas production wellbore from a methane hydrate formation. The study focused on the short- and long-term mechanical behaviour of the critical physical components at and near the wellbore by simulating the construction processes of the wellbore as well as the production stage. The interaction between cement-casing-formation was examined in detail.

Item Type: Conference or Workshop Item (UNSPECIFIED)
Subjects: UNSPECIFIED
Divisions: Div D > Geotechnical and Environmental
Depositing User: Cron Job
Date Deposited: 17 Jul 2017 19:42
Last Modified: 01 Sep 2020 05:38
DOI: 10.4043/25208-ms