马春晓,尹洪军,唐鹏飞,杨春城,王磊,FU Jing
MA Chunxiao,YIN Hongjun,TANG Pengfei,YANG Chuncheng,WANG Lei,FU Jing

• 1:东北石油大学提高采收率教育部重点实验室
• 2:非常规油气成藏与开发省部共建国家重点实验室培育基地
• 3:大庆油田有限责任公司采油工程研究院
• 4:Geological Science&Engineering college of Missouri University of Science and Technology

摘要(Abstract)：

为直观反映低渗透油藏压裂水平井的渗流过程,建立了压裂水平井不稳定渗流的数学模型。考虑启动压力梯度的影响,利用有限元方法进行离散求解,得到不同时间地层中的渗流场,并对渗流场特征进行了分析。结果表明:压裂水平井的渗流分为裂缝附近的线性流、裂缝附近的拟径向流、复合地层的线性流、地层的拟径向流和边界流5个阶段;水平井最外侧2条裂缝附近的流体动用最好,裂缝之间存在干扰作用,2条裂缝中间沿着井筒方向存在死油区;随着裂缝条数的增加,区域的整体流线密度增加,裂缝之间死油区的面积减小,区域整体动用情况更好。
In order to visually reflect the seepage process of the fractured horizontal wells in the low-permeable oil reservoirs,the mathematical model of the unsteady seepage flow for the fractured horizontal wells is established.Considering the influences of the threshold pressure gradient and by means of finite element method,the discrete solutions are solved and then the seepage fields in the formations at different times are obtained,and furthermore the characteristics of the fields are analyzed.The results show that there are five seepage stages for the above flow:the linear seepage near the fractures,the pseudo radial seepage near the fractures,the linear seepage in the composite fonnations,the pseudo radial seepage in the formations and the boundary seepage;The developed effects of the outboard two fractures at the end of the horizontal well is the best,there is the dead oil between two fractures along the wellhole because of the disturbing effects;for the whole area,with the rise of the fracture number,the density of the stream line is larger,the dead area among the fractures is smaller,the much better the developed effects will be.

关键词(KeyWords)： 有限元;压裂水平井;启动压力梯度;渗流场;死油区
finite element;fractured horizontal well;threshold/startup pressure gradient;seepage field;dead/ bypassed/retained/residual oil area

Abstract:

Keywords:

基金项目(Foundation): 黑龙江省教育厅科学技术研究项目“煤层气藏渗流机理研究”(12531070)

作者(Author): 马春晓,尹洪军,唐鹏飞,杨春城,王磊,FU Jing
MA Chunxiao,YIN Hongjun,TANG Pengfei,YANG Chuncheng,WANG Lei,FU Jing

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