Development of a Bottomhole Pressure Calculator
and Its Application to Shale Gas Wells

doi:10.12972/ksmer.2015.52.3.335

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2015 Vol.52, Issue 3 Preview Page Next Page

Technical Report

Development of a Bottomhole Pressure Calculator and Its Application to Shale Gas Wells 정저압력 계산 프로그램의 개발과 셰일 가스정에서의 검증: 김재준 · 김우수 · 강주명 · 석화수 · 민배현
Jaejun Kim, Usu Kim, Joe M. Kang, Hwasoo Suk and Baehyun Min

30 June 2015. pp. 335-342

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Abstract

Measuring bottomhole pressure accurately in shale gas wells is a difficult task owing to long-lastingtransient flow. This study develops a program to predict bottomhole pressure based on pressure loss correlationsusing wellhead pressure and gas flow rate. The program adopts Gray correlation and Advanced Gray correlationmainly applied to wet gas wells as well as Beggs and Brill correlation applied to oil-gas wells. For a Marcellusshale gas well, the program provides similar performance compared to commercial software. This application shows9% difference in the case of using Beggs and Brill correlation and 3% difference in the case of using Graycorrelation. For 102 wet gas wells, Advanced Gray correlation yields the absolute average relative error of 9%whereas Beggs and Brill correlation and Gray correlation give 25% error and 10% error, respectively. This programcould be applied to the calculation of bottomhole pressure in conventional oil-gas reservoirs as well.

Keywords

Bottomhole pressure

Shale gas wells

Pressure loss correlation

Advanced Gray correlation

이 연구는 수 년 이상 지속되는 천이유동으로 인하여 정확한 정저압력의 측정이 어려운 셰일가스전에서 압력손실 상관법에 기반하여 정두압력 및 가스 생산량으로부터 정저압력을 추정하는 프로그램을 개발하였다.개발한 프로그램은 유·가스전에서 보편적으로 사용하는 Beggs & Brill 상관법과 습식 가스전에 주로 사용하는Gray 상관법, 기존 Gray 상관법의 단점을 보완한 Advanced Gray 상관법을 탑재하였다. 북미 셰일가스전의 생산자료에 대한 상용 소프트웨어와의 비교 검증 결과, 개발한 프로그램은 Beggs & Brill 상관법의 경우 약 9%,Gray 상관법의 경우 약 3%의 정저압력 편차를 나타내어 관내 압력손실 예측의 정확도를 확인하였다. 습식 가스전 생산자료를 이용한 검증 결과, Advanced Gray 상관법은 약 9%의 절대 평균 상대오차를 나타내어 각각 약25%와 약 10%의 오차를 나타낸 Beggs & Brill 상관법 및 Gray 상관법보다 우수한 예측성능을 보였다. 개발한프로그램은 정저압력이 미확보된 셰일가스전 및 재래 유･가스전의 정저압력의 계산에 효율적으로 활용할 수있다.

키워드

정저압력

셰일가스

압력손실 상관법

개선된 그레이 상관법

References

Beggs, H. and Brill, J., 1973, “A Study of Two-Phase Flow in Inclined Pipes,” Journal of Petroleum Technology, Vol. 25, No. 5, pp. 607-617.
Fekete Associates Inc., 2015.05.01., http://fekete.com/SAN/ TheoryAndEquations/HarmonyTheoryEquations/Default.htm.
Govier, G.W. and Fogarasi, M., 1975, “Pressure Drop in Wells Producing Gas and Condensate,” Journal of Canadian Petroleum Technology, Vol. 14, No. 4, pp. 28-41.
Gray, H.E., 1974, “Vertical Flow Correlation in Gas Wells,” User Manual for API 14B Subsurface Controlled Safety Valve Sizing Computer Program, Appendix B. Washington, DC.
Kumar, N., 2005, “Improvements for Flow Correlations for Gas Wells Experiencing Liquid Loading,” SPE Western Regional Meeting, Irvine, California, USA, March 30- April 1.
Zhou, W., Gupta, S., Banerjee, R., Poe, B., Spath, J., and Thambynayagam, M., 2013, “Production Forecasting and Analysis for Unconventional Resources,” The 6th International Petroleum Technology Conference, Beijing, China, March 26-28.

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 : 52
No :3
Pages :335-342
DOI :https://doi.org/10.12972/ksmer.2015.52.3.335

[1] Beggs, H. and Brill, J., 1973, “A Study of Two-Phase Flow in Inclined Pipes,” Journal of Petroleum Technology, Vol. 25, No. 5, pp. 607-617.

[2] Fekete Associates Inc., 2015.05.01., http://fekete.com/SAN/ TheoryAndEquations/HarmonyTheoryEquations/Default.htm.

[3] Govier, G.W. and Fogarasi, M., 1975, “Pressure Drop in Wells Producing Gas and Condensate,” Journal of Canadian Petroleum Technology, Vol. 14, No. 4, pp. 28-41.

[4] Gray, H.E., 1974, “Vertical Flow Correlation in Gas Wells,” User Manual for API 14B Subsurface Controlled Safety Valve Sizing Computer Program, Appendix B. Washington, DC.

[5] Kumar, N., 2005, “Improvements for Flow Correlations for Gas Wells Experiencing Liquid Loading,” SPE Western Regional Meeting, Irvine, California, USA, March 30- April 1.

[6] Zhou, W., Gupta, S., Banerjee, R., Poe, B., Spath, J., and Thambynayagam, M., 2013, “Production Forecasting and Analysis for Unconventional Resources,” The 6th International Petroleum Technology Conference, Beijing, China, March 26-28.

Journal of the Korean Society of Mineral and Energy Resources Engineers ISSN:2288-0291(Print) 2288-2790(Online) 한국자원공학회지

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