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非达西渗流效应对低渗透气藏直井产能的影响

来源:成都理工大学学报(自然科学版)2012年04期 日期:2012-09-07 浏览量:
非达西渗流效应对低渗透气藏直井产能的影响 
Impact of non-Darcy flow on vertical well productivity in low-permeability gas reservoirs 
【作者】 张楠; 鲜波; 陈亮; 徐锋; 严仁田; 罗华; 
【Author】 ZHANG Nan1,XIAN Bo2,CHEN Liang3,XU Feng4,YAN Ren-tian1,LUO Hua1 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
 
【机构】 中国石油长城钻探工程有限公司; 中国石油塔里木油田分公司勘探开发部; 中国石油新疆油田公司; 油气藏地质及开发工程国家重点实验室(西南石油大学);
 
【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%。
 
 
【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. 还原
 
【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;
 
 
【Key words】 low-permeability gas reservoir; stress sensitivity; start-up pressure gradient; slippage effect; productivity equation; non-Darcy seepage; binomial flow;
 
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