Econ. Environ. Geol. 2013; 46(4): 279-289

Published online August 31, 2013

© THE KOREAN SOCIETY OF ECONOMIC AND ENVIRONMENTAL GEOLOGY

Development of Designing and Performing Procedure for Well Test in Coalbed Methane(CBM) Reservoir

Jinyoung Park and Jeonghwan Lee*

Depatment of Energy and Resources Engineering, College of Engineering, Chonnam National University, Gwangju, 500-757, Korea

Correspondence to : Jeonghwan Lee

Received: May 20, 2013; Revised: July 23, 2013; Accepted: August 11, 2013

Abstract

The most critical factor in developing coalbed methane(CBM) reservoir is absolute permeability. Both productivity and economics of the CBM depend on the absolute permeability. The methods to estimate it are core analysis and well test. However, absolute permeability determined by core analysis cannot be a good representative of CBM reservoir. Therefore, it is generally estimated by well test. In this study, well test methods applicable of CBM reservoir were classified with their characteristics. Merits and demerits of each well tests were also analyzed. Based on those parameters, design considerations and procedures of well test were derived. After each well tests was performed, the procedure of well test interpretations to estimate reservoir properties such as absolute permeability and skin factor was presented.

Keywords coalbed methane, well test, slug test, injection falloff test, absolute permeability

Article

Econ. Environ. Geol. 2013; 46(4): 279-289

Published online August 31, 2013

Copyright © THE KOREAN SOCIETY OF ECONOMIC AND ENVIRONMENTAL GEOLOGY.

Development of Designing and Performing Procedure for Well Test in Coalbed Methane(CBM) Reservoir

Jinyoung Park and Jeonghwan Lee*

Depatment of Energy and Resources Engineering, College of Engineering, Chonnam National University, Gwangju, 500-757, Korea

Correspondence to:Jeonghwan Lee

Received: May 20, 2013; Revised: July 23, 2013; Accepted: August 11, 2013

Abstract

The most critical factor in developing coalbed methane(CBM) reservoir is absolute permeability. Both productivity and economics of the CBM depend on the absolute permeability. The methods to estimate it are core analysis and well test. However, absolute permeability determined by core analysis cannot be a good representative of CBM reservoir. Therefore, it is generally estimated by well test. In this study, well test methods applicable of CBM reservoir were classified with their characteristics. Merits and demerits of each well tests were also analyzed. Based on those parameters, design considerations and procedures of well test were derived. After each well tests was performed, the procedure of well test interpretations to estimate reservoir properties such as absolute permeability and skin factor was presented.

Keywords coalbed methane, well test, slug test, injection falloff test, absolute permeability

    KSEEG
    Jun 30, 2024 Vol.57 No.3, pp. 281~352

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