煤层气排采过程中煤储层孔隙度模型及变化规律
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- 英文论文题名：Porosity model and variation law of coal reservoir in coalbed methane production process
- 论文作者：赵俊龙 ; 汤达祯 ; 高丽军 ; 许浩 ; 孟艳军 ; 吕玉民
- 英文论文作者：Zhao Junlong ; Tang Dazhen ; Gao Lijun ; Xu Hao ; Meng Yanjun ; Lyu Yumin ; School of Energy Resources ; China University of Geosciences(Beijing) ; Lab of Coal Reservoir ; National Engineering Research Center of Coalbed Methane Development and Utilization ; Engineering and Technology Branch ; CNOOC Energy Technology and Services Company Limited ; New Energy Research Center ; CNOOC Research Institute
- 年：2016
- 作者机构：中国地质大学(北京)能源学院;煤层气开发利用国家工程中心煤储层实验室;中海油能源发展股份有限公司工程技术分公司;中海油研究总院新能源研究中心;
- 论文关键词：煤储层 ; 孔隙度 ; 煤层气 ; 临界解吸压力
- 英文论文关键词：coal reservoir ; porosity ; coalbed methane ; critical desorption pressure
- 会议召开时间：2016-11-29
- 会议录名称：第三届煤炭科技创新高峰论坛——煤炭绿色开发与清洁利用技术与装备论文集
- 语种：中文
- 分类号：TE311
- 学会代码：ZGMT
- 会议名称：第三届煤炭科技创新高峰论坛——煤炭绿色开发与清洁利用技术与装备
- 会议地点：中国北京
- 主办单位：中国煤炭工业协会、中国煤炭科工集团有限公司、中国煤炭学会、煤炭科学研究总院
- 学会名称：中国煤炭学会
- 页数：6
- 文件大小：450k
- 原文格式：O
- 会议级别：全国
摘要
为准确表征开发过程中欠饱和煤储层孔隙度变化,以临界解吸压力为界,在煤基质收缩及有效应力耦合作用下建立煤储层孔隙度模型,以此分析了排采过程中孔隙度随孔隙压力的变化规律。研究结果表明,开发过程中孔隙度变化一般经历4个阶段:排水降压段、缓慢降压段、弥补反弹段、快速增长段,分别与生产过程中气、水产出变化阶段相对应;孔隙度变化程度主要受控于反弹压力点与临界解吸压力点之间的配置关系,反弹压力越接近临界解吸压力,基质收缩强度越大,孔隙度反弹能力越强:在生产过程形成的压降漏斗内,各点孔隙度变化可以反映该点储层压力的变化,扩大压降漏斗内孔隙度反弹压力面和等孔隙度压力面,有利于提高煤层气井产能。
In order to accurately characterize the porosity variation of the less saturated coal reservoir during the development process,a porosity model of the coal reservoir was established based on the critical desorption pressure as the boundary and in consideration of the coal matrix shrinkage and effective stress coupling role.Thus with the variation law of the porosity pressure,the porosity during the mining process was analyzed.The study results showed that in the development process,the porosity variation would have four stages and they would be the water drainage and pressure releasing stage,the slow pressure releasing stage,supplement rebound stage and rapid increasing stage.Those stages would be relevant to the gas and water output variation stage in the production process.The porosity variation degree was mainly controlled by the configuration relationship between the rebound pressure point and the critical desorption pressure.When the rebound pressure was closed to the critical desorption pressure,the matrix shrinkage strength would be higher and the rebound capacity of the porosity would be stronger.Within the pressure released hopper formed during the production process,each point porosity variation could reflect the pressure variation of the coal reservoir,could expand the rebound pressure surface of the porosity in the pressure released and hopper and the porosity pressure surface and could be favorable to improve the production capacity of the coalbed methane well.
In order to accurately characterize the porosity variation of the less saturated coal reservoir during the development process,a porosity model of the coal reservoir was established based on the critical desorption pressure as the boundary and in consideration of the coal matrix shrinkage and effective stress coupling role.Thus with the variation law of the porosity pressure,the porosity during the mining process was analyzed.The study results showed that in the development process,the porosity variation would have four stages and they would be the water drainage and pressure releasing stage,the slow pressure releasing stage,supplement rebound stage and rapid increasing stage.Those stages would be relevant to the gas and water output variation stage in the production process.The porosity variation degree was mainly controlled by the configuration relationship between the rebound pressure point and the critical desorption pressure.When the rebound pressure was closed to the critical desorption pressure,the matrix shrinkage strength would be higher and the rebound capacity of the porosity would be stronger.Within the pressure released hopper formed during the production process,each point porosity variation could reflect the pressure variation of the coal reservoir,could expand the rebound pressure surface of the porosity in the pressure released and hopper and the porosity pressure surface and could be favorable to improve the production capacity of the coalbed methane well.
引文
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[10]胡朝元,彭苏萍,赵士华,等.煤层气储层参数多信息综合定量预测方法[J].煤田地质与勘探,2005,33(1):28-32.Hu Chaoyuan,Peng Suping,Zhao Shihua,et al The qualitative prediction methods of coalbed gas reservoir parameters[J].Coal Geology&Exploration,2005,33(1):28-32.
[11]卢军灵,李淑畅.寺河矿区煤层气藏富集主控地质因素研究[J].中州煤炭,2015(11):118-121.Lu Junling.Li Shut-hang.Study on enrichment controlling geological factors of CBM reservoir in Sihe Mine[J].Zhongzhou Coal,2015(11):118-121.
[12]许准,赵永刚,李洪,等.平顶山矿区十三矿二_1煤煤层气地质条件分析[J].中州煤炭,2014(1):93-95.Xu Zhun,Zhao Yonggang,Li Hong.et al.Analysis on coalbed methane geological condition of Coal seam 2jin the Nol3.Coal Mine,Pingdingshan Mine Area[J].Zhongzhou Coal,2014(1):93-95.
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[15]Harppalani S.Shraufnage R A.Shrinkage of coal matrix with release of gas and its impaction permeability of coal[J].Fuel,1990,69(12):551-556.
[16]Shi J Q.Durucan S.Drawdown induced changes in permeability of coalbeds:a new interpretation of the reservoir response to primary recovery[J].Transport in Porous Media,2004,56(1):1-16.
[17]Pan Z J,Luke D C.Modeling permeability for coal reservoirs:a review of analytical models and testing data[J].International Journal of Coal Geology,2012,92(3):1-44.
[18]赵阳升,胡耀青,杨栋,等.三维应力下吸附作用对煤岩体气体渗流规律影响的实验研究[J].岩石力学与工程学报,1999,18(6):651-653.Zhao Yangsheng.Hu Yaoqing,Yang Dong,et al/.The experimental study on the gas seepage law of rock related to adsorption under 3D stresses[J].Chinese Journal of Rock Mechanics and Engineering,1999,18(6):651-653.
[19]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):409-416.Chen Zhenhong,Wang Yibin,Yang Jiaosheng,et al.Influencing factors on coalbed methane production of single well:a case of Fanzhuang Block in the south part of Qinshui Basin[J].Acta Petrolei Sinica,2009,30(3):409-416.
[20]Lyu Y M,Tang D Z,Xu H,et al.Production characteristics and the key factors in high-rank coalbed methane Fields:A case study on the Fanzhuang Block,southern Qinshui Basin,China[J],International Journal of Coal Geology,2012,96(7):93-108.
[21]任广磊,李治平,张跃磊,等.渗透率应力敏感性对煤层气井产能的影响[J].煤炭科学技术,2012,40(4):104-107.Ren Guanglei,Li Zhiping,Zhang Yuelei,et al.Stress sensitivity of permeability affected to production capacity of coalbed methane well[J].Coal Science and Technology,2012,40(4):104-107.
[22]倪小明,陈鹏,朱明阳.煤层气垂直井产能主控地质因素分析[J].煤炭科学技术,2010,38(7):109-113.Ni Xiaoming,Chen Peng,Zhu Mingyang.Analysis on main control geological factors of production capacity of vertical coalbed methane well[J].Coal Science and Technology,2010,38(7):109-113.
[23]刘世奇,桑树勋,李梦溪,等.沁水盆地南部煤层气井网排采压降漏斗的控制因素[J].中国矿业大学学报,2012,41(6):943-950.Liu Shiqi,Sang Shuxun,Li Mengxi,et al.Control factors of coalbed methane well depressurization funnel under drainage well network in southern Qinshui Basin[J].Journal of China University of Mining&Technology,2012,41(6):943-950.
[2]Cui X J,Bustin R M.Volumetric strain associated with methane desorption and its impact on coalbed gas production from deep coal seams[J].American Association of Petroleum Geologists Bulletin,2005,89(9):1181-1202.
[3]李少华,张昌民,胡爱梅,等.煤储层孔隙度的协同模拟[J].煤炭学报,2007,32(9):980-983.Li Shaohua,Zhang Changmin,Hu Aimei,et al.Building porosity model of coalbed using collocated cokriging[J]Journal of China Coal Society,2007,32(9):980-983.
[4]金振奎,王春生.煤层灰分对其储集性能的影响[J].天然气工业,2005,25(1):55-56.Jin Zhenkui,Wang Chunsheng.Influence of coal ash content on coal reservoirbehavior[J].Natural Gas Industry,2005,25(1):55-56.
[5]周军平,鲜学福,姜永东,等.考虑有效应力和煤基质收缩效应的渗透率模型[J].西南石油大学学报:自然科学版,2009,31(1):4-8.Zhou Junping,Xian Xuefu,Jiang Yongdong,eJ al.k permeability model considering the effective stress and matrix shrinkage effects[J].Journal of Southwest Petroleum University:Natural Science,2009,31(1):4-8.
[6]Zimmerman R W.Somerton W H.Sking M.Compressibility of Rocks[J].Journal of Geophysical Research,1986,91(12):12765-12777.
[7]傅雪海,秦勇,张万红.高煤级煤基质力学效应与煤储层渗透率耦合关系分析[J].高校地质学报,2003,9(3):373-377.Fu Xuehai.Qin Yong.Zhang Wanhong.Coupling correlation between high-rank coal matrix mechanic effect and coal reservoir permeability[J].Geological Journal of China Universities,2003,9(3):373-377.
[8]何志勇,刘海涛,汪铖,等.利用地震属性预测煤层气储层孔隙度方法[J].煤炭技术,2011,30(4):132-134.He Zhiyong.Liu Haitao.Wang Cheng,et al.Seismic attributions analysis and its application in predicting porosity[J].Coal Technology,2011,30(4):132-134.
[9]张延庆,程增庆.用地震资料预测煤层气储层参数的方法初探[J].煤田地质与勘探,2002,30(4):24-26.Zhang Yanqing,Cheng Zengqing.Discussion on prediction methods of coal reservoir parameters by seismic technology[J].Coal Geology&Exploration,2002,30(4):24-26.
[10]胡朝元,彭苏萍,赵士华,等.煤层气储层参数多信息综合定量预测方法[J].煤田地质与勘探,2005,33(1):28-32.Hu Chaoyuan,Peng Suping,Zhao Shihua,et al The qualitative prediction methods of coalbed gas reservoir parameters[J].Coal Geology&Exploration,2005,33(1):28-32.
[11]卢军灵,李淑畅.寺河矿区煤层气藏富集主控地质因素研究[J].中州煤炭,2015(11):118-121.Lu Junling.Li Shut-hang.Study on enrichment controlling geological factors of CBM reservoir in Sihe Mine[J].Zhongzhou Coal,2015(11):118-121.
[12]许准,赵永刚,李洪,等.平顶山矿区十三矿二_1煤煤层气地质条件分析[J].中州煤炭,2014(1):93-95.Xu Zhun,Zhao Yonggang,Li Hong.et al.Analysis on coalbed methane geological condition of Coal seam 2jin the Nol3.Coal Mine,Pingdingshan Mine Area[J].Zhongzhou Coal,2014(1):93-95.
[13]Bradley J S.Powley D E.Pressure compartments in sedimentary basins:a review[J].American Association of Petroleum Geologists Memoir,1994,61(1):3-26.
[14]Levine J R.Model study of the influence of matrix shrinkage on absolute permeability of coalbed reservoirs[J].Geological Society,1996,109(1):197-212.
[15]Harppalani S.Shraufnage R A.Shrinkage of coal matrix with release of gas and its impaction permeability of coal[J].Fuel,1990,69(12):551-556.
[16]Shi J Q.Durucan S.Drawdown induced changes in permeability of coalbeds:a new interpretation of the reservoir response to primary recovery[J].Transport in Porous Media,2004,56(1):1-16.
[17]Pan Z J,Luke D C.Modeling permeability for coal reservoirs:a review of analytical models and testing data[J].International Journal of Coal Geology,2012,92(3):1-44.
[18]赵阳升,胡耀青,杨栋,等.三维应力下吸附作用对煤岩体气体渗流规律影响的实验研究[J].岩石力学与工程学报,1999,18(6):651-653.Zhao Yangsheng.Hu Yaoqing,Yang Dong,et al/.The experimental study on the gas seepage law of rock related to adsorption under 3D stresses[J].Chinese Journal of Rock Mechanics and Engineering,1999,18(6):651-653.
[19]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):409-416.Chen Zhenhong,Wang Yibin,Yang Jiaosheng,et al.Influencing factors on coalbed methane production of single well:a case of Fanzhuang Block in the south part of Qinshui Basin[J].Acta Petrolei Sinica,2009,30(3):409-416.
[20]Lyu Y M,Tang D Z,Xu H,et al.Production characteristics and the key factors in high-rank coalbed methane Fields:A case study on the Fanzhuang Block,southern Qinshui Basin,China[J],International Journal of Coal Geology,2012,96(7):93-108.
[21]任广磊,李治平,张跃磊,等.渗透率应力敏感性对煤层气井产能的影响[J].煤炭科学技术,2012,40(4):104-107.Ren Guanglei,Li Zhiping,Zhang Yuelei,et al.Stress sensitivity of permeability affected to production capacity of coalbed methane well[J].Coal Science and Technology,2012,40(4):104-107.
[22]倪小明,陈鹏,朱明阳.煤层气垂直井产能主控地质因素分析[J].煤炭科学技术,2010,38(7):109-113.Ni Xiaoming,Chen Peng,Zhu Mingyang.Analysis on main control geological factors of production capacity of vertical coalbed methane well[J].Coal Science and Technology,2010,38(7):109-113.
[23]刘世奇,桑树勋,李梦溪,等.沁水盆地南部煤层气井网排采压降漏斗的控制因素[J].中国矿业大学学报,2012,41(6):943-950.Liu Shiqi,Sang Shuxun,Li Mengxi,et al.Control factors of coalbed methane well depressurization funnel under drainage well network in southern Qinshui Basin[J].Journal of China University of Mining&Technology,2012,41(6):943-950.
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