为解决滑套完井管柱水平井流入动态预测难题,基于自主研制的生产井筒流动物理模拟装置,开展了不同井筒主流和孔眼入流条件下滑套完井管柱井筒内的油、水单液相流动测试,建立滑套完井管柱井筒水力摩阻系数计算式与压降方程,研究井筒压降分布与流入动态特征的关系,并在番禺油田进行应用。结果表明:对于滑套完井管柱,滑套开孔、孔眼入流产生的附加阻力远大于滑套开度,约占总压降的10%～70%;在层流条件下,滑套开孔和孔眼入流对井筒主流都起阻碍作用;在湍流条件下,滑套开孔起阻碍作用,而孔眼入流起减阻作用;建立的水力摩阻系数表达式与压降方程误差小于1.00%,能够有效表征滑套开孔、孔眼入流等因素产生的附加阻力。研究成果可用于预测油井流入动态,为滑套完井管柱滑套开度的调节提供指导。
To address the challenge of predicting inflow dynamics in horizontal completion string with sliding sleeves,oil-water single-phase flow tests were conducted inside the wellbore of completion string with sliding sleeves under different mainstream and inflow conditions using a self-developed physical simulation device for production wellbore flow.Calculation formulas for hydraulic friction coefficients and pressure drop equations in the wellbore with sliding sleeve completion string were established.The relationship between wellbore pressure drop distribution and inflow dynamics was studied, and the methods were applied in Panyu Oilfield.The results indicate that for completion string with sliding sleeves,the additional resistance generated by sliding sleeve openings and inflow from perforations is significantly greater than the resistance from the sliding sleeve openings alone,accounting for approximately 10% to 70% of the total pressure drop.Under laminar flow conditions,both sliding sleeve openings and inflow from perforations hinder the mainstream flow in the wellbore.Under hydraulic flow conditions, sliding sleeve openings hinder the flow, while inflow from perforations reduces resistance.The established expressions for hydraulic friction coefficients and pressure drop equations have an error of less than 1.00%,which can effectively characterize the additional resistance caused by factors such as sliding sleeve openings and inflow from perforations.The research findings can be utilized to predict inflow performance of well and provide guidance for adjusting the opening of sliding sleeves in completion string.
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