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Petroleum Science

, Volume 12, Issue 4, pp 684–691

First Online: 16 September 2015Received: 11 May 2015

Abstract

According to dimensionless analysis of the coalbed methane CBM production data of Fanzhuang block in southern Qinshui basin, the dimensionless gas production rate is calculated to quantitatively divide the CBM well production process into four stages, i.e., drainage stage, unstable gas production stage, stable gas production stage, and gas production decline stage. By the material balance method, the coal reservoir permeability change in different stages is quantitatively characterized. The characteristics and control mechanisms of change in coalbed permeability CICP during different production stages are concluded on five aspects, i.e., permeability trend variation, controlling mechanism, system energy, phase state compositions, and production performance. The study reveals that CICP is characterized by first decline, then recovery, and finally by increase and is controlled directly by effective stress and matrix shrinkage effects. Further, the duration and intensity of the matrix shrinkage effect are inherently controlled by adsorption and desorption features.

KeywordsProduction stage Coalbed methane Permeability Dynamic change Control mechanism Edited by Xiu-Qin Zhu

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Autor: Da-Zhen Tang - Chun-Miao Deng - Yan-Jun Meng - Zhi-Ping Li - Hao Xu - Shu Tao - Song Li

Fuente: https://link.springer.com/



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