低渗透油田有杆抽油系统模糊优化设计

Fuzzy Optimization Design of Rod Pumping System for Low Permeability Oilfield

低渗透油田地质情况复杂、开采难度大、成本较高,具有不同于常规油田的抽油系统特征,深入研究有杆抽油系统优化设计将产生明显的经济效益。有杆抽油系统模糊优化设计依据低渗透油田特点,以油层供液能力和采油设备协调为基础,采用优化的隶属函数,建立实用的权重矩阵,基于模糊评判方法进行方案优选,确定系统抽汲参数与各种机械设备类型和规格,预测相应抽汲参数下的工况指标。现场实例设计结果表明,模糊优化设计与油田实际设计原则一致,其结果准确可靠、简明直观。模糊优化设计可以提供多种方案,能够详细描述多种方案优劣程度,便于参考对比,灵活选择。最佳方案既可以按照综合评判结果直接确定,也可以综合对比多种方案,进一步进行人工优选。研究结果能够为新型采油设备的研发提供重要的参考数据。

The low permeability oilfields usually have complex geological conditions, great development diffi- culties and high costs with different pumping system features from conventional oilfield. An in-depth study on rod pumping system optimization design could present significant economic benefits. Considering the low permeability oilfield features and on the basis of layer feed flow capacity and production equipment coordination, the fuzzy opti- mization design for rod pumping system establishes a practical weight matrix by using optimized membership func- tion. The scheme optimal selection is conducted based on the fuzzy evaluation method. The system pumping parame- ters and types and specifications of each machinery and equipment are determined. Then, the operating conditions under corresponding pumping parameter index are predicted. The on-site practical design results show that the fuzzy optimization design is consistent with the principles of the field practical design with accurate and reliable re- sults. Fuzzy optimum design could provide a variety of schemes with detailed advantages and disadvantages, which is benefit for reference, comparison and flexible selection. The best solution could either be directly determined in accordance with the comprehensive evaluation results or be comprehensively compared with a variety of schemes for further optimization by hands. The study results could provide important and accurate reference data for the develop- ment of novel oil production equipment.