Steady Flow Productivity Equation for Stress Sensitivity Coal bed Methane Gas Well#br#
Received date: 2009-11-27
Revised date: 2010-03-10
Online published: 2011-04-10
A large number of experiments show that stress sensitivity exists in the coal reservoirs and has a significant effect on the gas production of coal-bed methane wells. Based on former experimental results, we set up the mathematical relationship between coal-bed permeability and effective pressure or formation pressure, both of them well fit the exponential correlation. We also build the gas well productivity equation for coal reservoir stress sensitivity under Darcy and non-Darcy steady flow conditions. The result shows that the productivity of coal-bed methane wells are greatly affected by the stress sensitivity. With drawdown pressure increases, gas production increases little, and gradually goes towards stability. So a reasonable drawdown pressure for gas production will be required.
Key words： Coal-bed methane; Stress sensitivity; Productivity; Steady flow; Darcy flow; Non-Darcy flow.
YANG Man-Ping, WANG Gang, XU Sheng-Yang, GAO Chao . Steady Flow Productivity Equation for Stress Sensitivity Coal bed Methane Gas Well#br# [J]. Natural Gas Geoscience, 2011 , 22(2) : 347 -351 . DOI: 10.11764/j.issn.1672-1926.2011.02.347
［1］Yang Manping.The Study of Oil-gas Reseivoir Porosity Medium's Deformation Theory and Applications［D］.Chengdu:Journal of Southwest Petroleum Institute,2004:102-122.［杨满平.油气储层多孔介质的变形理论及应用研究［D］.成都:西南石油学院, 2004：102-122.］
［2］Yang Manping,Li Yun,Li Zhiping.An experimental study on stress sensitivity of gas reservoir rock with irreducible water［J］.Natural Gas Geoscience,2004,15(3):227-229.［杨满平,李允,李治平.气藏含束缚水储层岩石应力敏感性实验研究［J］.天然气地球科学,2004,15(3):227-229.］
［3］Scott A R,Kaiser W R.Hydrogeologic factor affecting dynamic open-hole cavity complections in the San Juan basin,U.S.A.Proceedings of the 1995 Coalbed Met hane Symposium[C].Tuscaloosa:The University of Alabama,May 15-19,1995:139-147.
［4］Chen Zhenhong,Wang Yibing,Guo Kai,et al.Stress sensitivity of high-rank coalbed methane reservoir［J］.Acta Geologica Sinica,2008,82(10):1390-1394.［陈振宏，王一兵，郭凯,等，高煤阶煤层气藏储层应力敏感性研究［J］.地质学报,2008,82(10):1390-1394.］
［5］Sommerton W J,Soylemezoglu I M,Dudley R C.Efectof stresson permeability of coal［J］.Int.J.Rock Mech.Min.Sci.and Geomech.Abstr.,1975,12(21):129-145.
［6］McKee C R,Bumb A C,Koenig R A.Stress-dependent permeability and porosity of coal［C］//Fassett J E ed.Geology and Coal-bed Methane Resources of the Northern San Juan Basin.Colorado,USA:Rocky Mountain Association of Geologists Guidebook,1988:143-l53.
［7］Brace W E.A note on permeability changes in geologic material due to stress［J］.Pageoph,1978,116(4/5):627-632.
［8］Hu Yaoqing,Zhao Yangsheng,Wei Jinping,et al.Experimental study of permeating law of coal mass gas under action three dimension stress［J］.Journal of Xi'an Mining Institute,1996,6(4):308-311.［ 胡耀青，赵阳升，魏锦平,等.三维应力作用下煤体瓦斯渗透规律实验研究［J］.西安矿业学院学报,1996,6(4):308-311.］
［9］Jiang Deyi,Zhang Guangyang,Hu Yaohua,et al.Study on affection to permeability of gas of coal layers by effective stress［J］.Journal of Chongqing University:Natural Science Edition,1997,20 (5) :22-25.［姜德义,张广洋,胡耀华,等.有效应力对煤层气渗透率影响的研究［J］.重庆大学学报:自然科学版,1997,20 (5) :22-25.］
［10］Sun Peide.Testing study on coal specimen permeability during solid deformation process［J］.Chinese Journal of Rock Mechanics and Engineering,2001,20(supplement):1801-1804.［孙培德.变形过程中煤样渗透率变化规律的实验研究［J］.岩石力学与工程学报,2001,20(增):1801-1804.］
［11］Wang Bo,Jiang Bo,Wang Hongyan,et al.Coalbed methane reservoir permeability changes of the physical simulation of experimental study［J］.Natural Gas Geoscience,2005,16(5):684-686.［王勃，姜波，王红岩，等.煤层气储层渗透率变化规律的物理模拟实验研究［J］.天然气地球科学，2005，16（5）：684-686.］
［12］Li Yun,Li Zhiping.Gas or Condensate Gas Well Test and Productivity Evaluation［M］.Beijing:Petroleum Industry Press,2000:6-12.
李允,李治平.气井及凝析气井产能试井与产能评价［M］.北京:石油工业出版社,2000:6-12.］
/
| 〈 |
|
〉 |
甘公网安备 62010202000678号