滑脱系数动态变化对煤层气运移的影响
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摘要
煤层气在低渗透性煤层渗流时受滑脱效应影响显著,目前的煤层气渗流模型大都将滑脱系数视为常数,然而在煤层气抽采时受有效应力和煤基质收缩效应影响,滑脱系数是动态变化的。据此,建立考虑动态滑脱系数的煤层气渗流模型,并采用有限元数值软件进行模拟分析;研究考虑动态滑脱效应后煤储层渗透率和滑脱系数随抽采时间变化规律;比较考虑动态滑脱系数与固定初始滑脱系数时,煤储层孔隙压力变化差异。研究结果表明:随着抽采时间的增加,滑脱系数先增大后减小,渗透率先减小后增大;考虑动态滑脱效应时,抽采30 d后煤储层各处的孔隙压力降低幅度较不考虑时均有所减小,且初始渗透率越低两者的差距越大。
In the seepage of low permeability coal seam, the slippage effect is obviously affected by the seepage effect. In the current CBM seepage model, the slippage coefficient is regarded as a constant. Based on this, a gas seepage model with dynamic slip coefficient is established, and the finite element numerical software is used for simulation analysis. The variation law of permeability and slippage coefficient of coal reservoir with extraction time is studied after considering dynamic slippage effect. The difference of pore pressure in coal reservoir is compared when dynamic slip coefficient and fixed initial slip coefficient are considered. The results show that the slip coefficient increases first and then decreases, and the permeability decreases first and then increases with the increase of extraction time. When the dynamic slippage effect is taken into account, the reduction of pore pressure at all places of the coal reservoir after 30 d of extraction is smaller than that without consideration, and the difference between the two is larger with the lower initial permeability.
In the seepage of low permeability coal seam, the slippage effect is obviously affected by the seepage effect. In the current CBM seepage model, the slippage coefficient is regarded as a constant. Based on this, a gas seepage model with dynamic slip coefficient is established, and the finite element numerical software is used for simulation analysis. The variation law of permeability and slippage coefficient of coal reservoir with extraction time is studied after considering dynamic slippage effect. The difference of pore pressure in coal reservoir is compared when dynamic slip coefficient and fixed initial slip coefficient are considered. The results show that the slip coefficient increases first and then decreases, and the permeability decreases first and then increases with the increase of extraction time. When the dynamic slippage effect is taken into account, the reduction of pore pressure at all places of the coal reservoir after 30 d of extraction is smaller than that without consideration, and the difference between the two is larger with the lower initial permeability.
引文
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[16]李立功,康天合,李彦斌.考虑动态克林伯格系数的煤储层渗透率预测模型[J].地球物理学报,2018(1):304-310.
[17]Yu-Shu Wu,Karsten Pruess,Peter Persoff.Gas flow in porous media with Klinkenberg effects[J].Transport in Porous Media,1998,32(1):117-137.
[18]Kewen li,Roland N Horne.Gas slippage in two-phase flow and the effect of temperature[J].SPE 68778,2001:1-9.
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[20]肖晓春,潘一山.考虑滑脱效应的煤层气渗流数学模型及数值模拟[J].岩石力学与工程学报,2005,24(16):2966-2970.
[21]肖晓春.滑脱效应影响的低渗透储层煤层气运移规律研究[D].阜新:辽宁工程技术大学,2009.
[22]张春会,于永江,岳宏亮,等.考虑Klinbenberg效应的煤中应力-渗流耦合数学模型[J].岩土力学,2010,31(10):3217-3222.
[23]郭平.滑脱效应和基质变形对低渗透煤体渗流特性影响的试验研究[J].煤矿安全,2016,47(7):9-13.
[24]赵洪宝,李伟,胡桂林.煤层渗透特性影响因素的研究现状与思考[J].煤矿安全,2016,47(7):177-181.
[25]茹忠亮,马国胜.考虑Klinkenberg效应的多孔介质气体渗流模型[J].中国科技论文,2018,13(3):310.
[26]Reiss L H.The reservoir engineering aspects of fractured formations[M].Paris:Editions Technip,1980.
[27]Massartto P,Golding S D,Rudolph V.Constant volume CBM reservoirs:An important principle[C]∥International coalbed methane symposium.Tuscaloosa:University of Alabama,1999.
[28]马强.煤层气储层渗透率变化规律理论与实验研究[D].北京:中国矿业大学(北京),2011.
[2]朱益华,陶果,方伟,等.低渗气藏中气体渗流Klinkenberg效应研究进展[J].地球物理学进展,2007,22(5):1591-1596.
[3]刘东.煤层气开采中煤储层参数动态演化的物理模拟试验与数值模拟分析研究[D].重庆:重庆大学,2014.
[4]KLINKENBERG L J.The permeability of porous media to liquids and gases[J].API Drilling and Production Practice,1941,23:200-213.
[5]王勇杰,王昌杰.低渗透多孔介质中气体滑脱行为研究[J].石油学报,1995,16(3):101-105.
[6]陈代询,王章瑞,高家碧.气体滑脱现象的综合特征参数研究[J].天然气工业,2003,23(4):96-100.
[7]Sampath K,Keighin C W.Factors affecting gas slippage in tight sandstones of cretaceous age in the uinta basin[J].Journal of Petroleum Technology,1982,34(11):2715-2720.
[8]FO Jones,WW Owens.A Laboratory Study of Low-Permeability Gas Sands[J].Journal of Petroleum Technology,1980,32(9):31-40.
[9]Joel D Walls,Amos Nur.Pore pressure and confining pressure dependence of permeability in sandstone[J].7th.formation evaluation symposium of the Canadian Well Logging Society in Calgary,1979,10:21.
[10]Xiaohua Peng,Yishan Pan,Xiaochun Xiao,et al.The experiment study on slippage effect of the coal-bed methane transfusion[J].International Journal of Coal Science&Technology,2008,14(4):530.
[11]王茜,张烈辉,钱治家,等.考虑科林贝尔效应的低渗、特低渗气藏数学模型[J].天然气工业,2003,23(6):100-102.
[12]朱光亚,刘先贵,李树铁,等.低渗气藏气体渗流滑脱效应影响研究[J].天然气工业,2007,27(5):44.
[13]吴英,程林松,宁正福.低渗气藏克林肯贝尔常数和非达西系数确定新方法[J].天然气工业,2005,25(5):78-80.
[14]肖晓春,潘一山.滑脱效应影响的低渗煤层气运移实验研究[J].岩土工程学报,2009(10):1554-1558.
[15]于丽艳,潘一山,肖晓春,等.低渗煤层气藏气体KlinKenberg效应试验研究[J].水资源与水工程学报,2011,22(2):15-19.
[16]李立功,康天合,李彦斌.考虑动态克林伯格系数的煤储层渗透率预测模型[J].地球物理学报,2018(1):304-310.
[17]Yu-Shu Wu,Karsten Pruess,Peter Persoff.Gas flow in porous media with Klinkenberg effects[J].Transport in Porous Media,1998,32(1):117-137.
[18]Kewen li,Roland N Horne.Gas slippage in two-phase flow and the effect of temperature[J].SPE 68778,2001:1-9.
[19]覃建华,肖晓春,潘一山,等.滑脱效应影响的低渗储层煤层气运移解析分析[J].煤炭学报,2010,35(4):619-622.
[20]肖晓春,潘一山.考虑滑脱效应的煤层气渗流数学模型及数值模拟[J].岩石力学与工程学报,2005,24(16):2966-2970.
[21]肖晓春.滑脱效应影响的低渗透储层煤层气运移规律研究[D].阜新:辽宁工程技术大学,2009.
[22]张春会,于永江,岳宏亮,等.考虑Klinbenberg效应的煤中应力-渗流耦合数学模型[J].岩土力学,2010,31(10):3217-3222.
[23]郭平.滑脱效应和基质变形对低渗透煤体渗流特性影响的试验研究[J].煤矿安全,2016,47(7):9-13.
[24]赵洪宝,李伟,胡桂林.煤层渗透特性影响因素的研究现状与思考[J].煤矿安全,2016,47(7):177-181.
[25]茹忠亮,马国胜.考虑Klinkenberg效应的多孔介质气体渗流模型[J].中国科技论文,2018,13(3):310.
[26]Reiss L H.The reservoir engineering aspects of fractured formations[M].Paris:Editions Technip,1980.
[27]Massartto P,Golding S D,Rudolph V.Constant volume CBM reservoirs:An important principle[C]∥International coalbed methane symposium.Tuscaloosa:University of Alabama,1999.
[28]马强.煤层气储层渗透率变化规律理论与实验研究[D].北京:中国矿业大学(北京),2011.
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