| 非达西渗流效应对低渗透气藏直井产能的影响 |
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| 引用本文： | 张楠,鲜波,陈亮,徐锋,严仁田,罗华. 非达西渗流效应对低渗透气藏直井产能的影响[J]. 成都理工大学学报(自然科学版), 2012, 39(4): 438-442. DOI: 10.3969/j.issn.1671-9727.2012.04.015 |
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| 作者姓名： | 张楠 鲜波 陈亮 徐锋 严仁田 罗华 |
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| 作者单位： | 1.中国石油长城钻探工程有限公司,辽宁盘锦,124010;2.中国石油塔里木油田分公司勘探开发部,新疆库尔勒,841000;3.中国石油新疆油田公司,新疆克拉玛依,834000;4.油气藏地质及开发工程国家重点实验室(西南石油大学),成都,610500 |
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| 摘 要： | 由于低渗透气藏普遍具有低孔、低渗、高含水特征,导致其气体渗流表现出明显的非达西渗流效应,如应力敏感效应、启动压力梯度及滑脱效应.鉴于此,基于Forchheimer二项式渗流方程,引入新的拟压力函数,推导出综合考虑应力敏感效应、启动压力梯度及气体滑脱效应共同影响下的气藏直井产能模型.并以某低渗透气藏为例,研究这些效应对其产能的影响程度.结果表明;应力敏感效应比启动压力梯度、滑脱效应对直井产能的影响强烈得多;应力敏感使气井产量最大可下降49.46％;启动压力梯度使气井产量平均可下降3.09％;气体滑脱效应使气井产量平均可增加2.58％.
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| 关 键 词： | 低渗透气藏 应力敏感 启动压力 滑脱效应 产能方程 非达西流 二项式渗流 |
Impact of non-Darcy flow on vertical well productivity in low-permeability gas reservoirs |
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| ZHANG Nan , XIAN Bo , CHEN Liang , XU Feng , YAN Ren-tian , LUO Hua. Impact of non-Darcy flow on vertical well productivity in low-permeability gas reservoirs[J]. Journal of Chengdu University of Technology: Sci & Technol Ed, 2012, 39(4): 438-442. DOI: 10.3969/j.issn.1671-9727.2012.04.015 |
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| Authors: | ZHANG Nan XIAN Bo CHEN Liang XU Feng YAN Ren-tian LUO Hua |
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| Affiliation: | 1.Great Wall Drilling Company of PetroChina,Panjin 124010,China; 2.Exploration and Development Department of Tarim Oilfield Company,PetroChina,Korla 841000,China; 3.Xinjiang Oilfield Company of PetroChina,Karamay 834000,China; 4.State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation,Southwest Petroleum University,Chengdu 610500,China |
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| Abstract: | The obvious non-Darcy seepage effects of gas percolation,such as stress sensitive effect,start-up pressure gradient and slippage effect are due to the low porosity,low permeability and high water cut in low-permeability gas reservoirs.Therefore,based on the Forchheimer binomial flow equation,a new pseudo-pressure function is introduced and a new improved vertical well productivity equation considering the comprehensive influences of stress sensitive effect,start-up pressure gradient and slippage effect is deduced.The above-mentioned effects are studied based on the real data from a low-permeability gas reservoir.The results indicate that the impact of stress sensitive effect on the productivity is much stronger than that of start-up pressure gradient and slippage effect.Specifically,stress sensitivity effect can result in a significant decrease of gas well deliverability with a maximum rate of 49.46%,while start-up pressure gradient can also lead to a decrease of deliverability with 3.09% and slippage effect can increase the deliverability with 2.58% on average. |
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| Keywords: | low-permeability gas reservoir stress sensitivity start-up pressure gradient slippage effect productivity equation non-Darcy seepage binomial flow |
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