低渗透油藏水平井产能评价研究

发布时间：2018-01-03 01:21

本文关键词：低渗透油藏水平井产能评价研究　出处：《西南石油大学》2017年硕士论文　论文类型：学位论文

【摘要】：本文以低渗透油藏水平井产能为研究对象,在深入调研国内外相关文献的基础上,对现有典型水平井产能预测模型的适用条件、影响因素、产能预测结果等进行了对比研究,并在此基础上提出了考虑井筒摩擦阻力影响的低渗透油藏水平井产能预测公式。首先,对现有典型的水平井产能预测模型从模型假设出发,结合其推导过程,系统总结了各种水平井产能预测模型的适用条件。并就于丹丹预测模型中没有给出pf表达式的问题,通过进一步的研究给出了pf的数学表达式和产能计算公式,完善了于丹丹公式。其次,在已有井筒摩阻研究的基础上,将水平井筒划分成若干微元段,推导出了流体以不同形式进入水平段流入剖面的微元段压降和沿程总压降,并将其引入水平井产能预测模型,在现有的水平井产能公式基础上,推导出考虑井筒摩阻的水平井产能新公式。然后,针对低渗透油藏水平井产能受到启动压力梯度、表皮系数、井筒摩阻、水平段长度等地质、工程等因素影响的问题,分别对常规水平井产能、考虑启动压力梯度的水平井产能、考虑表皮系数的水平井产能、考虑井筒摩阻的水平井产能进行对比计算、分析,总结各因素对产能的影响。最后,运用Petrel软件对BM工区进行地质建模,利用现有典型的水平井产能公式和本文产能公式对BM油藏的不同开发方案的油井进行初期配产,再用Eclipse软件对该油藏的三种开发方案进行数值模拟预测研究,通过对比三种开发方案,发现用水平井开发该低渗透油藏较直井效果更好。
[Abstract]:In this paper, the productivity of horizontal wells in low permeability reservoirs as the research object, on the basis of in-depth investigation of domestic and foreign literature, on the existing typical horizontal wells productivity prediction model applicable conditions, influencing factors. The productivity prediction results are compared, and on this basis, a productivity prediction formula for horizontal wells in low permeability reservoirs considering the influence of wellbore friction resistance is put forward. Based on the assumption of the model, the present typical productivity prediction model of horizontal wells is combined with its derivation process. The application conditions of various horizontal well productivity prediction models are systematically summarized, and the problem that Yu Dan Dan prediction model does not give PF expression is given. Through further research, the mathematical expression and productivity formula of PF are given, and Yu Dan Dan formula is perfected. Secondly, on the basis of existing research on shaft friction, horizontal wellbore is divided into several micro-element sections. The pressure drop and the total pressure drop along the horizontal section are derived and introduced into the horizontal well productivity prediction model based on the existing horizontal well productivity formula. A new formula of horizontal well productivity considering wellbore friction is derived. Then, aiming at the low permeability reservoir horizontal well productivity is subjected to start-up pressure gradient, skin coefficient, wellbore friction, horizontal section length and other geological. The productivity of conventional horizontal wells, horizontal wells with starting pressure gradient, horizontal well productivity with skin factor and shaft friction are compared and calculated respectively. Finally, the geological modeling of BM area is carried out by using Petrel software. Using the existing typical horizontal well productivity formula and the productivity formula of this paper, the oil wells with different development plans of BM reservoir are initially produced. The numerical simulation and prediction of three development schemes of the reservoir are carried out by using Eclipse software. By comparing the three development schemes, it is found that the horizontal well is more effective than the straight well in developing the low permeability reservoir.
【学位授予单位】：西南石油大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TE328

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