各向异性矩形油藏垂直裂缝井产能研究

发布时间：2018-08-25 15:18

【摘要】：各向异性矩形油藏渗流机理的研究具有非常重要的现实意义。正确认识油藏渗透率各向异性有利于油田的产能预测、寻找水驱油过程剩余油的分布、寻找油田长期注水开发引起的高渗透带以及三次采油。由于储层渗透率各向异性影响介质的渗流过程,因此油气藏的各向异性不可忽略,故不能用均质储层的压力动态和产能曲线来代替各向异性储层的压力动态和产能曲线。本文首先运用点源函数和Newman乘积的思想得到各向异性矩形油藏普通直井的解,再运用汇源积分方法得到各向异性矩形油藏无限导流裂缝的解,最后运用有限导流函数的思想得到了该斜裂缝模型的有限导流裂缝解。本文研究了储层各向异性、斜裂缝与渗透率主轴的夹角、裂缝导流能力等对压力动态和产能曲线的影响,并得到如下结论:1)各向异性矩形油藏的渗流特征与均质储层的矩形油藏渗流特征存在着明显区别,这主要体现在储层各向异性影响了储层渗流方式,它主要表现在渗流的早期阶段;2)在各向异性矩形油藏的研究过程中,发现储层各向异性对压力动态和产能曲线的影响主要发生在早期线性渗流阶段、中间径向流阶段到拟稳态阶段之间的过渡段;3)在各向异性矩形油藏垂直裂缝井的研究中,发现斜裂缝与渗透率主轴的夹角对压力动态和理论产能曲线的影响主要发生在早期线性渗流阶段和中间径向渗流阶段;4)在各向异性矩形油藏有限导流裂缝的研究中,发现有限导流能力到压力动态和理论产能曲线的影响主要发生在早期线性流阶段。基于上述研究成果,本文对于各向异性储层的开发提供了理论的依据,本文得到的理论产量递减曲线和累计产能曲线为油藏的产量预测提供了依据,同时为后期油田开发方案设计提供了理论支撑。
[Abstract]:The study of percolation mechanism in anisotropic rectangular reservoirs is of great practical significance. The correct understanding of reservoir permeability anisotropy is conducive to the prediction of oilfield productivity, the search for the distribution of remaining oil in the process of water flooding, the search for high permeability zones and tertiary oil recovery caused by long-term waterflooding in oil fields. Because the anisotropy of reservoir permeability affects the percolation process of medium, the anisotropy of oil and gas reservoir can not be ignored, so the pressure performance and productivity curve of homogeneous reservoir can not be replaced by the pressure performance and productivity curve of anisotropic reservoir. In this paper, the point source function and Newman product are used to obtain the solution of normal straight well in anisotropic rectangular reservoir, and then the solution of infinite diversion fracture in anisotropic rectangular reservoir is obtained by Huiyuan integral method. Finally, the finite diversion crack solution of the oblique crack model is obtained by using the idea of finite diversion function. In this paper, the effects of reservoir anisotropy, angle between oblique fracture and permeability spindle and fracture conductivity on pressure performance and productivity curve are studied. The following conclusions are obtained: 1) the percolation characteristics of anisotropic rectangular reservoirs are obviously different from those of homogeneous rectangular reservoirs, which is mainly reflected in the reservoir anisotropy affecting the reservoir percolation mode. In the process of studying anisotropic rectangular reservoir, it is found that the influence of reservoir anisotropy on pressure performance and productivity curve mainly occurs in the early phase of linear percolation. In the study of vertical fractured wells in anisotropic rectangular reservoirs, It is found that the influence of angle between oblique fracture and permeability spindle on pressure dynamics and theoretical productivity curve mainly occurs in the early linear percolation stage and intermediate radial percolation stage (4) in the study of finite conductivity fractures in anisotropic rectangular reservoirs. It is found that the influence of the finite conductivity to the pressure dynamics and the theoretical productivity curve mainly occurs in the early linear flow stage. Based on the above research results, this paper provides a theoretical basis for the development of anisotropic reservoirs. The theoretical production decline curve and cumulative productivity curve obtained in this paper provide the basis for the reservoir production prediction. At the same time, it provides the theoretical support for the later stage oilfield development scheme design.
【学位授予单位】：中国地质大学(北京)
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TE328

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