摘要
为了使水平井变质量流压降模型更具合理性和准确性,更有效地分析油井产能和生产动态,通过回顾和分析以往关于水平井筒压降模型的计算理论与方法,利用现有实验数据回归分析建立了一种新的射孔完井压降计算回归模型,该模型能够实现射孔完井孔密、相位角连续变化时综合摩擦系数的求取和井筒压降的计算。通过实例对比分析可以看出,该模型和目前常见模型的计算精度较为接近、计算结果较为合理。该模型的提出可以为进一步改进油藏渗流与井筒流动耦合模型的理论研究提供参考。
Wellbore flow in horizontal wells can be divided into two categories, the constant mass flow and variable mass flow, depen- ding on the presence or absence of inflow through wellbore wall. Investigations of the constant mass flow can provide experimental methods and lay a theoretical basis for researches of the variable mass flow model, which is widely used in coupling models for reser- voir seepage with wellbore flow in horizontal wells, multi-stage hydraulic fractured horizontal wells and branched horizontal wells. The accuracy and rationality of the pressure drop model profoundly can influence the prediction of well productivity and production performance. Through the literature review and analysis of the previous models, we developed a new regression model capable of cal- culating friction factors and pressure drop during ceaseless variation of the shooting density and phasing degree in perforated comple- tion. The results from the previous models and the new one were compared and discussed, which may provide reference for model se- lection of the variable mass flow and improve studies on coupling models of wellbore flow with reservoir seepage.
出处
《石油学报》
EI
CAS
CSCD
北大核心
2014年第1期93-98,共6页
Acta Petrolei Sinica
基金
国家重大科技专项(2011ZX05024-003
2011ZX05010-002)
四川省教育厅科研重点项目(11ZA016)
西南石油大学科技基金项目(2013XJZ004)资助
关键词
水平井
变质量流
井筒压降
摩擦系数
回归方法
horizontal well
variable mass flow
wellbore pressure drop
friction factor
regression method
