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| 低渗透储层中氮气的微尺度流动及其对渗流的影响 | |
| 引用本文： | 王斐,岳湘安,庞宏伟,王雯靓. 低渗透储层中氮气的微尺度流动及其对渗流的影响[J]. 西安石油大学学报(自然科学版), 2012, 27(1): 57-59,120 |
| 作者姓名： | 王斐 岳湘安 庞宏伟 王雯靓 |
| 作者单位： | 1. 川庆钻探工程有限公司地质勘探开发研究院,四川成都,610051 2. 中国石油大学(北京)石油工程教育部重点实验室,北京,102249 3. 中国石油天然气集团公司伊朗公司,北京,100011 4. 川庆钻探工程有限公司川西钻探公司,四川成都,610000 |
| 基金项目： | 国家973计划项目，子课题 |
| 摘 要： | 从气体在低渗透储层微米量级孔喉中的微尺度流动规律研究入手,探讨低渗透储层中气体的非线性渗流机理.实验研究了气体(N2)在内径为2.05～10.10μm微管中的流动规律.结果表明:气体在微管中的流动具有明显的微尺度效应,表现为实测流量大于经典流体力学理论预测流量;管径越小,流动压力越小,微尺度流动效应越强,实测流量与预测流量的偏离越显著.根据微管实验数据,结合毛管束模型,研究了气体微尺度流动效应对渗流的影响.结果表明:考虑孔喉中气体的微尺度流动效应后,低渗透多孔介质中气体的渗流具有非线性特征,表现为视渗透率随流动压力的减小而增加;多孔介质平均孔喉直径越小,视渗透率随压力的变化越明显. |
| 关 键 词： | 低渗透储层 气体渗流 非线性渗流 微尺度流动 毛管束模型 |
Micro-scale flow effect of nitrogen in low-permeability reservoir and its influence on gas seepage |
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| WANG Fei,YUE Xiang-an,PANG Hong-wei,WANG Wen-liang. Micro-scale flow effect of nitrogen in low-permeability reservoir and its influence on gas seepage[J]. Journal of Xian Shiyou University, 2012, 27(1): 57-59,120 | |
| Authors: | WANG Fei YUE Xiang-an PANG Hong-wei WANG Wen-liang |
| Affiliation: | 1.Research Institute of Geological Exploration and Development,Chuanqing Drilling Engineering Limited Company,Chengdu 610051,Sichuan,China;2.Key Laboratory of MOE for Petroleum Engineering,China University of Petroleum(Beijing),Beijing 102249,China;3.Iran Branch,CNPC,Beijing 100011,China;4.Chuanxi Drilling & Exploration Company,Chuanqing Drilling Engineering Limited Company,Chengdu 610000,Sichuan,China) |
| Abstract: | The nonlinear seepage mechanism of gas in low-permeability reservoir is discussed by studying the micro-scale effect of gas flowing through the micro-sized pores in low-permeability reservoirs.The flow characteristics of gas(N2) in the micro-tubes of the diameter of 2.05~10.1μm are experimentally investigated.The results indicate that,the real flow rate in experiments is always greater than that predicted by the classic fluid mechanics theory,which is called as the micro-scale flow effect of gas,and that,the less the diameter of the micro-tubes and the flow pressure,the stronger the micro-scale flow effect of gas,or the greater the difference between the real flow rate and the predicted flow rate.The influence of the micro-scale flow effect on the seepage of gas in low-permeability reservoir was studied based on the micro-tube experiment data and capillary bundle model.It is shown that,the seepage of gas in low-permeability porous media is nonlinear when the micro-scale flow effect of gas is considered.The apparent permeability of gas in low-permeability reservoir increases with the decrease of gas flow pressure,which becomes more obvious when the mean diameter of pores and throats in the porous media becomes small. |
| Keywords: | low-permeability reservoir gas seepage characteristic nonlinear seepage micro-scale flow capillary bundle model |
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