页岩基质中甲烷传质输运产能计算模型
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摘要
页岩气藏基质中存在吸附气和游离气,通过扩散和渗流两种传输机制进行流动。为了研究页岩气藏基质产气规律,推导了一维页岩基质产气量计算公式,扩散体积流量与入口压力成线性正比关系,渗流体积流量与入口压力成二次函数关系,渗透率越高、扩散系数越大,则体积流量越大。在此基础上,设计了全直径页岩岩心甲烷解吸、扩散、渗流耦合实验,研究了产气量与压力的变化关系;并通过拟稳态阶段的实验数据验证了一维页岩基质产气量计算公式的正确性。利用模型计算结果预测了页岩气传质输运实验未来体积流量的变化趋势:当入口压力达到15 MPa时,渗流体积流量在耦合流量中所占比例接近50%;当入口压力低于15 MPa时,扩散体积流量在耦合流量中所占比例较高。
Matrix of shale gas contains adsorbed gas and free gas. They flow in shale gas matrix by diffusion and transport two kinds of mechanisms. In order to research gas production law in shale gas matrix,on the one hand,one-dimensional gas production calculation model of shale matrix was derived. Diffusion volume flow with inlet pressure is linearly proportional relationship. Seepage volume flow with inlet pressure is quadratic function. Higher permeability and lager diffusion coefficient make the volume flow greater. Methane desorption,diffusion,flow coupling experiments of whole diameter shale core were designed. The relation between gas production and pressure was studied. The correctness of gas production formula in shale matrix was verified by the quasi-steady experimental data of shale gas. The model results predict the experimental volume flow of future trends of shale gas mass transfer and transport. When the inlet pressure reaches 15 MPa,seepage volume flow is close to 50% in the proportion of the coupling flow. When the inlet pressure is lower than 15 MPa,diffusion flow is high proportion in coupling volume flow.
Matrix of shale gas contains adsorbed gas and free gas. They flow in shale gas matrix by diffusion and transport two kinds of mechanisms. In order to research gas production law in shale gas matrix,on the one hand,one-dimensional gas production calculation model of shale matrix was derived. Diffusion volume flow with inlet pressure is linearly proportional relationship. Seepage volume flow with inlet pressure is quadratic function. Higher permeability and lager diffusion coefficient make the volume flow greater. Methane desorption,diffusion,flow coupling experiments of whole diameter shale core were designed. The relation between gas production and pressure was studied. The correctness of gas production formula in shale matrix was verified by the quasi-steady experimental data of shale gas. The model results predict the experimental volume flow of future trends of shale gas mass transfer and transport. When the inlet pressure reaches 15 MPa,seepage volume flow is close to 50% in the proportion of the coupling flow. When the inlet pressure is lower than 15 MPa,diffusion flow is high proportion in coupling volume flow.
引文
1徐兵祥,李相方,Manouchehr H,等.页岩气产量数据分析方法及产能预测.中国石油大学学报(自然科学版),2013;7(3):119-125Xu Bingxiang,Li Xiangfang,Manouchehr H,et al.Production data analysis and productivity forecast of shale gas reservoir.Journal of China University of Petroleum(Natural Science),2013;7(3):119-125
2周登洪,孙雷,严文德,等.页岩气产能影响因素及动态分析.油气藏评价与开发,2012;2(1):64-69Zhou Denghong,Sun Lei,Yan Wende,et al.The influencing factors and dynamic analysis of shale gas deliverability.Reservoir Evaluation and Development,2012;2(1):64-69
3高树生,于兴河,刘华勋.滑脱效应对页岩气井产能影响的分析.天然气工业,2011;31(4):55-58Gao Shusheng,Yu Xinghe,Liu Huaxun.Analysis of the effect of slippage effect on shale gas well productivity.Natural Gas Industry,2011;31(4):55-58
4钱旭瑞,刘广忠,唐佳,等.页岩气井产能影响因素分析.特种油气藏,2012;19(3):81-83Qian Xurui,Liu Guangzhong,Tang Jia,et al.Analysis of influencing factors on shale gas well productivity.Special Oil and Gas Reservoirs,2012;19(3):81-83
5李建秋,曹建红,段永刚,等.页岩气井渗流机理及产能递减分析.天然气勘探与开发,2011;34(2):34-37Li Jianqiu,Cao Jianhong,Duan Yonggang,et al.Analysis of percolation mechanism and productivity decline of shale gas wells.Natural Gas Exploration and Development,2011;34(2):34-37
6李亚洲,李勇明,罗攀,等.页岩气渗流机理与产能研究.断块油气田,2013;20(2):186-190Li Yazhou,Li Yongming,Luo Pan,et al.Study on seepage mechanism and productivity of shale gas.Fault-block Oil and Gas Field,2013;20(2):186-190
7邓佳,朱维耀,刘锦霞,等.考虑应力敏感性的页岩气产能预测模型.天然气地球科学,2013;24(3):456-460Deng Jia,Zhu Weiyao,Liu Jinxia,et al.Productivity prediction model of shale gas considering stress sensitivity.Natural Gas Geoscience,2013;24(3):456-460
8李晓强,周志宇,冯光,等.页岩基质扩散流动对页岩气井产能的影响.油气藏评价与开发,2011;4(5):67-70Li Xiaoqiang,Zhou Zhiyu,Feng Guang,et al.The impact of shale matrix difusion flow on shale gas capacity.Reservoir Evaluation and Development,2011;4(5):67-70
9王坤,张烈辉,陈飞飞.页岩气藏中两条互相垂直裂缝井产能分析.特种油气藏,2012;19(4):130-133Wang Kun,Zhang Liehui,Chen Feifei.Productivity analysis for wells in shale gas reservoir with orthogonal fractures.Special Oil and Gas Reservoirs,2012;19(4):130-133
10 Ertekin T,King G R,Schwerer F C.Dynamic gas slippage:a unique dual-mechanism approach to the flow of gas in tight formations.SPE Formation Evaluation,1986;1(1):43-52
11 Javadpour F.Nanopores and apparent permeability of gas flow in mudrocks.Journal of Canadian Petroleum Technology,2009;48(8):16-21
12 Roy S,Raju R,Chuang H F,et al.Modeling gas flow throughmicrochannels and nanopores.Journal of Applied Physics,2003;93(8):4870-4879
13 Swami V,Settari A.A pore scale gas flow model for shale gas reservoir:SPE155756.Richardson:SPE,2012
14姚同玉,黄延章,李继山.页岩气在超低渗介质中的渗流行为.力学学报,2012;44(6):990-995Yao Tongyu,Huang Yanzhang,Li Jishan.Flow regim for shale gas in extra low permeability porous media.Chinese Journal of Theoretical and Applied Mechanics,2012;44(6):990-995
15吴世跃.煤层中的耦合运动理论及其应用---具有吸附作用的气固耦合运动理论.北京:科学出版社,2009:29-31Wu Shiyue.Coupled motion theory and its application in coal seam---gas solid coupled motion theory with adsorption.Beijing:Science Press,2009:29-31
2周登洪,孙雷,严文德,等.页岩气产能影响因素及动态分析.油气藏评价与开发,2012;2(1):64-69Zhou Denghong,Sun Lei,Yan Wende,et al.The influencing factors and dynamic analysis of shale gas deliverability.Reservoir Evaluation and Development,2012;2(1):64-69
3高树生,于兴河,刘华勋.滑脱效应对页岩气井产能影响的分析.天然气工业,2011;31(4):55-58Gao Shusheng,Yu Xinghe,Liu Huaxun.Analysis of the effect of slippage effect on shale gas well productivity.Natural Gas Industry,2011;31(4):55-58
4钱旭瑞,刘广忠,唐佳,等.页岩气井产能影响因素分析.特种油气藏,2012;19(3):81-83Qian Xurui,Liu Guangzhong,Tang Jia,et al.Analysis of influencing factors on shale gas well productivity.Special Oil and Gas Reservoirs,2012;19(3):81-83
5李建秋,曹建红,段永刚,等.页岩气井渗流机理及产能递减分析.天然气勘探与开发,2011;34(2):34-37Li Jianqiu,Cao Jianhong,Duan Yonggang,et al.Analysis of percolation mechanism and productivity decline of shale gas wells.Natural Gas Exploration and Development,2011;34(2):34-37
6李亚洲,李勇明,罗攀,等.页岩气渗流机理与产能研究.断块油气田,2013;20(2):186-190Li Yazhou,Li Yongming,Luo Pan,et al.Study on seepage mechanism and productivity of shale gas.Fault-block Oil and Gas Field,2013;20(2):186-190
7邓佳,朱维耀,刘锦霞,等.考虑应力敏感性的页岩气产能预测模型.天然气地球科学,2013;24(3):456-460Deng Jia,Zhu Weiyao,Liu Jinxia,et al.Productivity prediction model of shale gas considering stress sensitivity.Natural Gas Geoscience,2013;24(3):456-460
8李晓强,周志宇,冯光,等.页岩基质扩散流动对页岩气井产能的影响.油气藏评价与开发,2011;4(5):67-70Li Xiaoqiang,Zhou Zhiyu,Feng Guang,et al.The impact of shale matrix difusion flow on shale gas capacity.Reservoir Evaluation and Development,2011;4(5):67-70
9王坤,张烈辉,陈飞飞.页岩气藏中两条互相垂直裂缝井产能分析.特种油气藏,2012;19(4):130-133Wang Kun,Zhang Liehui,Chen Feifei.Productivity analysis for wells in shale gas reservoir with orthogonal fractures.Special Oil and Gas Reservoirs,2012;19(4):130-133
10 Ertekin T,King G R,Schwerer F C.Dynamic gas slippage:a unique dual-mechanism approach to the flow of gas in tight formations.SPE Formation Evaluation,1986;1(1):43-52
11 Javadpour F.Nanopores and apparent permeability of gas flow in mudrocks.Journal of Canadian Petroleum Technology,2009;48(8):16-21
12 Roy S,Raju R,Chuang H F,et al.Modeling gas flow throughmicrochannels and nanopores.Journal of Applied Physics,2003;93(8):4870-4879
13 Swami V,Settari A.A pore scale gas flow model for shale gas reservoir:SPE155756.Richardson:SPE,2012
14姚同玉,黄延章,李继山.页岩气在超低渗介质中的渗流行为.力学学报,2012;44(6):990-995Yao Tongyu,Huang Yanzhang,Li Jishan.Flow regim for shale gas in extra low permeability porous media.Chinese Journal of Theoretical and Applied Mechanics,2012;44(6):990-995
15吴世跃.煤层中的耦合运动理论及其应用---具有吸附作用的气固耦合运动理论.北京:科学出版社,2009:29-31Wu Shiyue.Coupled motion theory and its application in coal seam---gas solid coupled motion theory with adsorption.Beijing:Science Press,2009:29-31