煤层气垂直井排采过程中压降传播规律研究
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摘要
在分析煤层气垂直井排采过程中井底压力变化特征的基础上,将煤层气井排采过程分为降压排采阶段和稳压排采阶段。重点研究了不同的储层边界条件下煤层气井在2种排采阶段中煤储层压力曲线传播规律,根据压降曲线变化特征将开放性边界条件下压降曲线划分为Ⅱ、V、Λ和O 4种类型;将封闭性边界条件下压降曲线划分为Ⅱ、V1、V2和V34种类型。排采过程中压降曲线受边界条件、储层物性和排采时间等因素的影响而形态各异,其变化规律可由以上几种类型曲线的选择性组合来表述。
Based on the analysis on variation characteristics of bottom hole pressure of coalbed gas wells during drainage and extraction phases, the whole drainage and extraction process of coalbed gas well is divided into pressure drop phase and stable pressure stage, the propagation laws of the pressure curve of coal reservoir in the two stages of drainage and mining under different reservoir boundary conditions are emphatically studied. The production curve is divided into four types:II, V, Λ and O according to the characteristics of pressure drop curves under open boundary condition, and four types:II, V1,V2 and V3 under closed boundary condition. The pressure drop curve in the process of drainage and mining varies in shape due to factors such as boundary conditions, reservoir property and drainage and mining time.
Based on the analysis on variation characteristics of bottom hole pressure of coalbed gas wells during drainage and extraction phases, the whole drainage and extraction process of coalbed gas well is divided into pressure drop phase and stable pressure stage, the propagation laws of the pressure curve of coal reservoir in the two stages of drainage and mining under different reservoir boundary conditions are emphatically studied. The production curve is divided into four types:II, V, Λ and O according to the characteristics of pressure drop curves under open boundary condition, and four types:II, V1,V2 and V3 under closed boundary condition. The pressure drop curve in the process of drainage and mining varies in shape due to factors such as boundary conditions, reservoir property and drainage and mining time.
引文
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[13]赵庆波,李五忠,孙粉锦.中国煤层气分布特征及高产富集因素[J].石油学报,1997,18(4):1-6.
[14]李贵红,张泓,张培河,等.晋城煤层气分布和主导因素的再认识[J].煤炭学报,2010,35(10):1680-1684.
[15]陈军斌,李璗.油气渗流力学[M].北京:石油工业出版社,2009:72-73.
[2]陶树,汤达祯,许浩,等.沁南煤层气井产能影响因素分析及开发建议[J].煤炭学报,2011,36(2):194.
[3]陈振宏,王一兵,杨焦生,等.影响煤层气井产量的关键因素分析-以沁水盆地南部樊庄区块为例[J].石油学报,2009,30(3):409-412.
[4] Greaves M,Ren S R, Rathbone R R, et al.Improved residual lightoil recovery by air injection(LTO process)[J].Journal of Canadian Petroleum Technology, 2000, 39(1):57-61.
[5]刘人和,刘飞,周文,等.沁水盆地煤岩储层单井产能影响因素[J].天然气工业,2008,28(7):30-33.
[6]潘建旭,王延斌,倪小明,等.资源条件与煤层气垂直井产能关系-以沁水盆地南部樊庄与潘庄区块为例[J].煤田地质与勘探,2011,39(4):24-27.
[7]刘保民.煤层气开采的水文地质控制和产能潜力评价方法研究[D].北京:中国矿业大学(北京),2012:130.
[8]张小东,倪小明,苏现波.煤层气开发地质学[M].北京:化学工业出版社,2010:158-168.
[9]杜严飞,吴财芳,邹明俊,等.煤层气排采过程中煤储层压力传播规律研究[J].煤炭工程,2011(7):87-89.
[10]秦勇,何天才.煤层气勘探与开发利用技术[M].徐州:中国矿业大学出版社,2007:145-148.
[11]马东民.煤层气井采气机理分析[J].西安科技学院学报,2003,23(2):156-159.
[12]赵金,张遂安.煤层气排采储层压降传播规律研究[J].煤炭科学技术,2012,40(10):65-68.
[13]赵庆波,李五忠,孙粉锦.中国煤层气分布特征及高产富集因素[J].石油学报,1997,18(4):1-6.
[14]李贵红,张泓,张培河,等.晋城煤层气分布和主导因素的再认识[J].煤炭学报,2010,35(10):1680-1684.
[15]陈军斌,李璗.油气渗流力学[M].北京:石油工业出版社,2009:72-73.