海上中高含水油田提液潜力动态计算方法

Dynamic calculation method for liquid production increase potential of offshore oilfield at high water cut stage

提液是海上中高含水油田减缓产量递减的一项有效措施。基于生产动态数据的油井提液动态分析方法克服了传统方法对区域静态资料的依赖性和局限性，但常规动态法只能计算无因次采液指数，难以量化提液潜力。基于渗流理论，首先建立油井无因次采液指数与含水率的定量表征关系，在此基础上研究油井无因次历史最大合理生产压差确定方法，并进一步提出油井最大产液量实时计算方法，从而达到动态法直接量化油井提液潜力的目的。应用实例表明，W油田实施提液后各井产液量基本达到了计算值，证实了该方法的合理性。该方法仅需要油井产液量和产油量2个基本生产动态数据就可以直接量化油井提液潜力，克服了海上油田区域静态资料不足的问题，具有数据基础简单、结果合理、操作简便和可实施性强等优点，可广泛应用于海上中高含水油田提液潜力评价。

Liquid production increase is an effective measure to reduce the decline of production in offshore oilfield at high water cut.Compared with traditional method,the dynamic analysis method based on dynamic production data of oil wells can evaluate liquid production increase potential and overcome the limitations and dependence on regional static data.But the conventional dynamic method can only calculate the dimensionless liquid production index and is hard to quantify the potential of liquid production increase.Dimensionless maximum reasonable production pressure difference of oil wells was calculated based on the direct quantitative relation between the dimensionless liquid production index and water cut which is established based on percolation theory.On this basis,the maximum daily liquid production of oil wells can be real-time calculated,achieving the purpose of quantifying oil well liquid production increase potential directly by the dynamic method.Application results show that the daily liquid production of each well has reached the design value after implementation in W oilfield,which proves the rationality of the method.Since only the data of daily liquid production and daily oil production of the wells are required,the proposed method overcomes the shortage of static data in offshore oilfield.This method has the features of accessible data,reliable calculation results and convenient implementation,showing a broad application prospect in offshore oilfield at medium-high water cut stage.