Int. J. of Oil, Gas and Coal Technology   »   2016 Vol.11, No.3

 

 

Title: Productivity and feasibility analysis of gas production from subsea sediment bearing with natural gas hydrate

 

Authors: Zhiwu Gong; Liang Zhang; Haiqing Cheng; Yanyong Wang; Di Qi; Shaoran Ren

 

Addresses:
School of Petroleum Engineering, China University of Petroleum (Huadong), No. 66, Changjiang West Road, Huangdao District, Qingdao, Shandong 266580, China
School of Petroleum Engineering, China University of Petroleum (Huadong), No. 66, Changjiang West Road, Huangdao District, Qingdao, Shandong 266580, China
Research Institute of Petroleum Exploration and Development, Liaohe Oilfield, CNPC, Panjin, 124000, China
School of Petroleum Engineering, China University of Petroleum (Huadong), No. 66, Changjiang West Road, Huangdao District, Qingdao, Shandong 266580, China
School of Petroleum Engineering, China University of Petroleum (Huadong), No. 66, Changjiang West Road, Huangdao District, Qingdao, Shandong 266580, China
School of Petroleum Engineering, China University of Petroleum (Huadong), No. 66, Changjiang West Road, Huangdao District, Qingdao, Shandong 266580, China

 

Abstract: A dynamics-model of natural gas hydrate (NGH) dissociation was established based on experimental results, which can be used for numerical simulation studies of gas production from subsea sediment bearing with hydrate. Three phases (aqueous, hydrate-solid and gaseous) and three components (water, methane hydrate and methane) were considered in the reservoir simulation model of gas hydrate. Comparisons between the numerical simulation and the experimental results were made to verify the simulation model. The reservoir model was then used to analyse the productivity of typical wells for gas production from hydrate via depressurisation, which was compared with that of conventional gas, tight gas and coalbed methane reservoirs to reveal the main features and feasibility of subsea NGH development. The simulation results indicated that, at similar reservoir scales, NGH reservoirs with hydrate saturation greater than 0.3 can have higher gas productivity than typical tight gas and coalbed methane reservoirs. That means gas production from NGH in subsea sediment can be feasible using the current technologies if reservoirs or formations with high hydrate saturation can be found, while its economics may be of further consideration. [Received: November 26, 2014; Accepted: April 15, 2015]

 

Keywords: natural gas hydrate; NGH reservoirs; reservoir simulation; gas productivity; tight gas; coalbed methane; hydrate dissociation; feasibility analysis; gas production; subsea sediment; dynamic modelling; numerical simulation; gas wells; depressurisation.

 

DOI: 10.1504/IJOGCT.2016.074773

 

Int. J. of Oil, Gas and Coal Technology, 2016 Vol.11, No.3, pp.229 - 248

 

Submission date: 26 Nov 2014
Date of acceptance: 15 Apr 2015
Available online: 17 Feb 2016

 

 

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