西南石油大学学报(自然科学版) ›› 2009, Vol. 31 ›› Issue (1): 61-64.DOI: 10.3863/j.issn.1674-5086.2009.01.015

• 石油与天然气工程 • 上一篇    下一篇

缝洞双重介质数值模型及渗流特征研究

彭小龙1 刘学利2 杜志敏1   

  1. 1.“油气藏地质及开发工程”国家重点实验室;西南石油大学,四川成都610500;2.中国石化西北油田分公司勘探开发研究院,新疆乌鲁木齐830011
  • 收稿日期:1900-01-01 修回日期:1900-01-01 出版日期:2009-02-20 发布日期:2009-02-20

NUMERICAL MODEL AND THE CHARACTERISTICS OF FLOWING THROUGH POROUS MEDIA OF FRACTURE AND VUG DUAL-MEDIA

PENG Xiao-long1 LIU Xue-li2 DU Zhi-min1   

  1. 1.State Key Laboratory of Oil/Gas Reservoir Geology and Exploitation,Southwest Petroleum University,Chengdu Sichuan 610500,China;2.Exploration and Exploitation Institute of SINOPEC Northwest Branch Company,Urumchi Xinjiang 830011,China
  • Received:1900-01-01 Revised:1900-01-01 Online:2009-02-20 Published:2009-02-20

摘要:

按储层特征和渗流特征,将缝洞双重介质模型分为三类,从数学角度简化成两类模型,即裂缝-基岩型和裂缝-孔洞型。前者采用Woren Root等常规双重介质模型,后者需要建立缝洞系统的窜流公式才能进行数值模拟计算。根据缝洞的组合特征以及裂缝中的压力分布特征,推导了缝洞介质的窜流计算公式,并以商业软件ECLIPSE为基础,通过修改特定的关键字,实现缝洞双重介质模型的等效模拟。在此基础上,研究分析了缝洞双重介质的渗流特征:当窜流系数较低,单相流的双对数试井曲线出现凹形特征;当窜流系数足够大,单相流的曲线形态与单一介质相似,不出现凹形特征,但油水两相流动可导致油井的含水率出现阶梯状

关键词: 裂缝, 溶洞, 双重介质, 窜流, ECLIPSE

Abstract:

According to the characteristics of reservoir and the flowing through porous media,the fracture and vug dual-media models are grouped into three types,and they can be simpified into two types mathmatically,i.e.,fracture-matrix and fracture-pore.The conventional Woren-Roof dual-media model is used in the former,and in the latter,the channeling formula of fracture-vug system must be established to perform numerical simulation calculation.According to the characteristics of fracture-vug association and the pressure distridution in fractures,the channelling calculation formula for freacture-vug media is derived,and commercial software ECLIPSE is taken as example,the equivalent simulation of fracture-vug dual-media model is realized by adjusting the specified key words.Based on the result,the characteristic of flowing through porous media of fracture-vug dualmedia are studied and analyzed,when the channelling coefficient is low,the log-log well test curve of single phase occures concave shape,and when the coefficient is large enough,the curve shape of single phase is similar to that of single media,no concave shape is shown,but the two-phase flow of oil and water can make water cut terrace-like shape.

Key words: fracture, dissolved pore, dual-media, channelling, ECLIPSE

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