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International Journal of Chemical Engineering
Volume 2017, Article ID 8267529, 13 pages
https://doi.org/10.1155/2017/8267529
Research Article

Coalbed Methane Production System Simulation and Deliverability Forecasting: Coupled Surface Network/Wellbore/Reservoir Calculation

1Southwest Petroleum University, Chengdu 610500, China
2China National Petroleum Corporation Guangzhou Petroleum Training Center, Guangzhou 510510, China
3Branch of China Petrochemical Marketing Co. Ltd., Jiangxi Yichun Oil Company, Yichun 336000, China
4China University of Petroleum, Beijing 102249, China

Correspondence should be addressed to Jun Zhou; nc.ude.upws@690010995102 and Guangchuan Liang; moc.361@rjdcgl

Received 21 October 2016; Accepted 21 December 2016; Published 31 January 2017

Academic Editor: Bhaskar Kulkarni

Copyright © 2017 Jun Zhou et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

As an unconventional energy, coalbed methane (CBM) mainly exists in coal bed with adsorption, whose productivity is different from conventional gas reservoir. This paper explains the wellbore pressure drop, surface pipeline network simulation, and reservoir calculation model of CBM. A coupled surface/wellbore/reservoir calculation architecture was presented, to coordinate the gas production in each calculation period until the balance of surface/wellbore/reservoir. This coupled calculation method was applied to a CBM field for predicting production. The daily gas production increased year by year at the first time and then decreased gradually after several years, while the daily water production was reduced all the time with the successive decline of the formation pressure. The production of gas and water in each well is almost the same when the structure is a star. When system structure is a dendritic surface system, the daily gas production ranked highest at the well which is the nearest to the surface system collection point and lowest at the well which is the farthest to the surface system collection point. This coupled calculation method could be used to predict the water production, gas production, and formation pressure of a CBM field during a period of time.