基于动态数据的无因次采液指数曲线计算方法

Calculation method of dimensionless liquid production index curve based on dynamic data

孙鹏霄 朱高科 李红正 李堪运 李翠平 刘晨 周文胜 6

中海石油（中国）有限公司，北京 100028 中国石油大港油田分公司第四采油厂，天津 300451 中国石化中原油田分公司工程技术管理部，河南 濮阳 457001 中国石油长庆油田分公司第一采油厂，陕西 延安 716009 海洋石油高效开发国家重点实验室，北京 100028 中海油研究总院有限责任公司，北京 100028

CNOOC Ltd., Beijing 100028, China No.4 Oil Production Plant, Dagang Oilfield Company, PetroChina, Tianjin 300451, China Department of Engineering and Technology Management, Zhongyuan Oilfield Company, SINOPEC, Puyang 457001, China No.1 Oil Production Plant, Changqing Oilfield Company, PetroChina, Yanan 716009, China State Key Laboratory of Offshore Oil Exploitation, Beijing 100028, China CNOOC Research Institute Ltd., Beijing 100028, China

水驱油田无因次采液指数随含水率变化的规律是油藏产能评价和举升方式选择的重要依据。目前常用计算方法不适用于测试资料缺乏的油田。文中基于分流量方程、相对渗透率幂函数表达式和近似理论水驱曲线，推导建立了无因次采液指数随含水率变化的表征公式，提出了一种利用累计产油量和累计产液量等日常生产数据直接计算无因次采液指数曲线的方法。实例应用表明，计算的无因次采液指数与实际测量点在不同含水率时均能很好地吻合，证明了新方法的准确性。新方法所需数据简单易取，计算简便，结果可靠，不仅可以计算油田的无因次采液指数曲线，还可以计算每口油井的无因次采液指数曲线，为油田现场精细化提液、设施液处理能力预留等动态分析工作提供了新的理论支撑。

The variation law of dimensionless liquid production index with water cut in water drive oilfield is an important basis for reservoir productivity evaluation and selection of lifting mode. At present, the common methods is not suitable for the field of lack of testing data. Based on the fractional flow equation, the relative permeability power function and the approximate theoretical water drive curve, the expression formula of dimensionless liquid production index changes with water cut is established, and a method of calculating the dimensionless production index curve directly with the cumulative oil production and cumulative liquid production is proposed. The example calculation shows that the dimensionless liquid production index calculated by the new method agrees well with the actual measurement point in different water content, which proves the accuracy of the new method. The new method has the advantages of simple data, easy calculation and reliable results. The dimensionless liquid production index curve can be calculated not only for oil field, but also for each well, which provides a new theoretical support for the dynamic analysis such as fine liquid production increasing and reservation of liquid processing capacity for platform in oil field.

10.6056/dkyqt202103019