A Study on the Well Test Analysis of Coalbed Methane Using the BFP-IFT

doi:10.12972/ksmer.2013.50.3.348

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2013 Vol.50, Issue 3 Preview Page Next Page

Research Paper

A Study on the Well Test Analysis of Coalbed Methane Using the BFP-IFT BFP-IFT 방법을 이용한 석탄층 메탄가스 저류층의 생산성 시험 해석 연구: 장호창 · 이정환
Hochang Jang and Jeonghwan Lee

30 June 2013. pp. 348-357

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Abstract

The permeability is obviously a critical parameter when evaluating the productivity of oil and gas reservoir. Normally, permeability can be obtained from the production analysis, core analysis, well test and etc. In case of Coalbed Methane (CBM), permeability should be obtained from well test because it is difficult to obtain permeability from core analysis. Also, suitable performance and analysis of well tests are needed to obtain reservoir parameters, because it is difficult to evaluate the production mechanism through the conventional method for CBM reservoir. In this study, CBM model was established base on the Black Warrior Basin’s reservoir properties. Using the established CBM model, Below Fracture Pressure-Injection/Falloff Test (BFP-IFT) was carried out to acquire well test data. As a result of pressure transient analysis, the error of estimating parameters were within the allowed value when for compared to model properties. Additionally, sensitivity analysis is performed for parameters affecting productivity (permeability, initial reservoir pressure) and its errors were within the allowed value in the CBM reservoir.

Keywords

Coalbed Methane

Well Test

Below Fracture Pressure-Injection/Fall off Test

Skin Factor

Wellbore Storage Effect

저류층의 투과도는 유·가스전의 생산성을 대표할 수 있는 가장 중요한 변수로써, 생산자료 분석, 코어 분석, 유정생산시험 등을 통해서 도출할 수 있다. 하지만 석탄층 메탄가스의 경우 시료 분석을 통한 투과도 결정이 어려우며, 기존의 가스전 생산 메커니즘만으로는 석탄층 메탄가스전의 유정생산시험 결과에 대한 평가를 정확히 할 수 없다. 따라서 석탄층 메탄가스전에 적합한 유정생산시험 수행 및 분석을 통한 투과도 도출이 요구된다. 이에 본 연구에서는 석탄층 메탄가스 저류층에 유정생산시험을 수행하고 그 결과를 분석하기위해 미국의 Black Warrior Basin의 기초 물성을 바탕으로 가상의 저류층을 구축하였다. 또한 구축된 저류층 모델에 주입-배출시험의 한 종류인 BFP-IFT(Below Fracture Pressure-Injection/Falloff Test)를 수행하여 유정생산시험 자료를 취득하였다. 취득된 자료를 분석한 결과, 저류층 구축에 사용한 물성과 비교했을 시 오차가 다소 발생하였으나 허용범위 내였으며, 추가적으로 석탄층 메탄가스의 생산 특성을 결정하는 두 가지 변수인 투과도와 초기 저류층 압력에 대한 민감도 분석을 한 결과 역시 오차 허용범위 내에서 일치함을 확인하였다.

키워드

석탄층 메탄가스

유정생산시험

BFP-IFT

손상인자

시추정저장효과

References

Bourdet, D., Ayoub, J.A. and Pirard, Y.M., 1989, “Use of Pressure Derivative in Well-Test Interpretation,” SPE Formation Evaluation, Vol. 4, No. 2, pp. 293-302.
Clarkson, C.R., 2010, “Coalbed Methane: Current Evaluation Methods, Future Technical Challenges,” SPE Unconventional Gas Conference, Society of Petroleum Engineers, Pittsburgh, Pennsylvania, USA, Feb. 23-25, pp. 7-16.
Cox, D.O., Young, G.B.C. and Bell, M.J., 1995, “Well Testing in Coalbed Methane (CBM) Wells: An Environmental Remediation Case History,” Annual Technical Conference and Exhibition, Society of Petroleum Engineers, Dallas, Texas, USA, Oct. 22-25, pp. 487-493.
ExxonMobil Exploration, 2011, “Coal Bed Methane (CBM) Permeability Testing,” WTN Network Meeting, ExxonMobil, Apr. 28-29, pp. 1-8.
FEKETE, 2013.1.28, http://www.fekete.com/software/ welltest/media/ webhelp/Sup erposition_Time.htm.
Halliburton, 2007, Coalbed Methane: Principles and Practices, Halliburton, Houston, Texas, USA, Chapter 4, pp. 193-206.
Jang, H., Lee, J., Shin, C., Lee, Y., Kwon, S. and Lee, W., 2012, “A Study on the Development Status and Key Technologies of Coalbed Methane,” J. of the Korean Society for Geosystem Engineering, Vol. 49, No. 4, pp. 545-556.
Jochen, V.A., Lee, W.J. and Semmelbeck, M.E., 1994, “Determining Permeability in Coalbed Methane Reservoirs,” SPE Annual Technical Conference and Exhibition, New Orleans, Louisiana, USA, Sep. 25-28, pp. 203-215, SPE 28584.
Kim, J., 2011, Development of an Evaluation Model on the Feasibility of CO₂ Sequestration using ANN, MS Thesis, Chonnam National Univ., Gwangju.
Ko, H., Ko, K., Ko, D., Ki, W., Kim, W., Kim, J., Kim, B., Kim, T., Park, S., Park, I., Yum, B., Lee, S.G., Lee S.R., Choi, B. and Hwang, S., 2008, “Exploration of Coalbed Methane,” The Ministry of Knowledge Economy, Final Report.
Liner, C.L., Geng, P., Zeng, J., King, H. and Li, J., 2011, “A CO₂ Sequestration Simulation Case Study at the Dickman Field, Ness Co., Kansas,” SPE Annual Technical Conference and Exhibition, Denver, Colorado, USA, Oct. 30-Nov. 2, pp. 1-15, SPE 145791.
Louis, M., 1997, “Derivative Analysis without Type Curves,” Proc. of Annual Technical Meeting, Petroleum Society of Canada, Alberta, Calgary, Jun. 8-11, pp. 1-11.
Mavor, M.J. and Saulsberry, J.L., 1996, A Guide to Coalbed Methane Reservoir Engineering, Gas Research Institute Chicago, Illinois, USA, Chapter 5, pp. 54-58.
Park, S., Kim, B., Ko, H., Choi, S., Hwang, S., Lee, W. and Shim, B., 2005, “Planning research project on Coal bed Methane (CBM) Potential for Korean Anthracite and Possibility of its Utilization,” The Ministry of Commerce, Industry and Energy, Final Report.
Ra, S., Park, H. and Sung, W., 1995, “The Analysis of Well Testing Data Using Automatic Type Curve Matching Model,” J. of the Korean Society for Geosystem Engineering, Vol. 32, No. 4, pp. 286-292.
Semmelback, M.E. and Lee, W.J., 1990, “Well Test Requirements for Evaluation of Coalbed Methane Development Potential,” The 65th Annual Technical Conference and Exhibition, Society of Petroleum Engineers, New Orleans, Louisiana, USA, Sep. 23-26, pp. 521-531, SPE 20669.
Zuber, M.D., Sparks, D.P. and Lee, W.J., 1990, “Design and Interpretation of Injection/Falloff Tests for Coalbed Methane Wells,” The 65th Annual Technical Conference and Exhibition, Society of Petroleum Engineers, New Orleans, Louisiana, USA, Sep 23-26, pp. 427-428, SPE 20569.

Information

Publisher :The Korean Society of Mineral and Energy Resources Engineers
Publisher(Ko) :한국자원공학회
Journal Title :Journal of the Korean Society of Mineral and Energy Resources Engineers
Journal Title(Ko) :한국자원공학회지
Volume : 50
No :3
Pages :348-357
DOI :https://doi.org/10.12972/ksmer.2013.50.3.348

[1] Bourdet, D., Ayoub, J.A. and Pirard, Y.M., 1989, “Use of Pressure Derivative in Well-Test Interpretation,” SPE Formation Evaluation, Vol. 4, No. 2, pp. 293-302.

[2] Clarkson, C.R., 2010, “Coalbed Methane: Current Evaluation Methods, Future Technical Challenges,” SPE Unconventional Gas Conference, Society of Petroleum Engineers, Pittsburgh, Pennsylvania, USA, Feb. 23-25, pp. 7-16.

[3] Cox, D.O., Young, G.B.C. and Bell, M.J., 1995, “Well Testing in Coalbed Methane (CBM) Wells: An Environmental Remediation Case History,” Annual Technical Conference and Exhibition, Society of Petroleum Engineers, Dallas, Texas, USA, Oct. 22-25, pp. 487-493.

[4] ExxonMobil Exploration, 2011, “Coal Bed Methane (CBM) Permeability Testing,” WTN Network Meeting, ExxonMobil, Apr. 28-29, pp. 1-8.

[5] FEKETE, 2013.1.28, http://www.fekete.com/software/ welltest/media/ webhelp/Sup erposition_Time.htm.

[6] Halliburton, 2007, Coalbed Methane: Principles and Practices, Halliburton, Houston, Texas, USA, Chapter 4, pp. 193-206.

[7] Jang, H., Lee, J., Shin, C., Lee, Y., Kwon, S. and Lee, W., 2012, “A Study on the Development Status and Key Technologies of Coalbed Methane,” J. of the Korean Society for Geosystem Engineering, Vol. 49, No. 4, pp. 545-556.

[8] Jochen, V.A., Lee, W.J. and Semmelbeck, M.E., 1994, “Determining Permeability in Coalbed Methane Reservoirs,” SPE Annual Technical Conference and Exhibition, New Orleans, Louisiana, USA, Sep. 25-28, pp. 203-215, SPE 28584.

[9] Kim, J., 2011, Development of an Evaluation Model on the Feasibility of CO₂ Sequestration using ANN, MS Thesis, Chonnam National Univ., Gwangju.

[10] Ko, H., Ko, K., Ko, D., Ki, W., Kim, W., Kim, J., Kim, B., Kim, T., Park, S., Park, I., Yum, B., Lee, S.G., Lee S.R., Choi, B. and Hwang, S., 2008, “Exploration of Coalbed Methane,” The Ministry of Knowledge Economy, Final Report.

[11] Liner, C.L., Geng, P., Zeng, J., King, H. and Li, J., 2011, “A CO₂ Sequestration Simulation Case Study at the Dickman Field, Ness Co., Kansas,” SPE Annual Technical Conference and Exhibition, Denver, Colorado, USA, Oct. 30-Nov. 2, pp. 1-15, SPE 145791.

[12] Louis, M., 1997, “Derivative Analysis without Type Curves,” Proc. of Annual Technical Meeting, Petroleum Society of Canada, Alberta, Calgary, Jun. 8-11, pp. 1-11.

[13] Mavor, M.J. and Saulsberry, J.L., 1996, A Guide to Coalbed Methane Reservoir Engineering, Gas Research Institute Chicago, Illinois, USA, Chapter 5, pp. 54-58.

[14] Park, S., Kim, B., Ko, H., Choi, S., Hwang, S., Lee, W. and Shim, B., 2005, “Planning research project on Coal bed Methane (CBM) Potential for Korean Anthracite and Possibility of its Utilization,” The Ministry of Commerce, Industry and Energy, Final Report.

[15] Ra, S., Park, H. and Sung, W., 1995, “The Analysis of Well Testing Data Using Automatic Type Curve Matching Model,” J. of the Korean Society for Geosystem Engineering, Vol. 32, No. 4, pp. 286-292.

[16] Semmelback, M.E. and Lee, W.J., 1990, “Well Test Requirements for Evaluation of Coalbed Methane Development Potential,” The 65th Annual Technical Conference and Exhibition, Society of Petroleum Engineers, New Orleans, Louisiana, USA, Sep. 23-26, pp. 521-531, SPE 20669.

[17] Zuber, M.D., Sparks, D.P. and Lee, W.J., 1990, “Design and Interpretation of Injection/Falloff Tests for Coalbed Methane Wells,” The 65th Annual Technical Conference and Exhibition, Society of Petroleum Engineers, New Orleans, Louisiana, USA, Sep 23-26, pp. 427-428, SPE 20569.

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