Economic and Environmental Geology (자원환경지질)

The Korean Society of Economic and Environmental Geology (대한자원환경지질학회)
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Development of Designing and Performing Procedure for Well Test in Coalbed Methane(CBM) Reservoir

석탄층 메탄가스 저류층의 유정생산시험 설계 및 수행절차 수립연구

  • Park, Jinyoung (Department of Energy and Resources Engineering, College of Engineering, Chonnam National University) ;
  • Lee, Jeonghwan (Department of Energy and Resources Engineering, College of Engineering, Chonnam National University)
  • 박진영 (전남대학교 에너지자원공학과) ;
  • 이정환 (전남대학교 에너지자원공학과)
  • Received : 2013.05.20
  • Accepted : 2013.08.11
  • Published : 2013.08.28
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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.

석탄층 메탄가스(coalbed methane; CBM)를 개발하는데 있어서 생산성과 경제성을 좌우하는 절대투과도(absolute permeability)를 산출하는 것은 매우 중요하다. 절대투과도를 측정하는 방법에는 코어분석(core analysis)과 유정생산 시험(well test) 등이 있다. 하지만 코어분석을 통해 도출된 절대투과도는 CBM 저류층을 대표할 수 없기에 일반적으로 유정생산시험을 통해 절대투과도가 산출된다. 이에 본 연구에서는 CBM 저류층에 적용 가능한 유정생산시험을 분류하고 각 시험기법별 특성 및 장 단점을 분석하였다. 이를 기반으로 유정생산시험 설계 및 수행절차를 수립하였으며, 유정생산시험 수행 후 취득된 자료를 통해 절대투과도와 손상지수(skin factor)와 같은 저류층 물성을 도출하기 위한 자료해석 절차를 제시하였다.

Keywords

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