大庆油田轻烃管网调度优化

Optimal scheduling of light hydrocarbon pipe network in Daqing Oilfield

为解决目前大庆轻烃管网间歇输送模式下频繁启停泵等问题,考虑站场外输模式、水力、站内罐容与节点分输流量等约束条件,基于定时步法,建立了在研究时间段内以输烃站场启泵次数最少为目标函数的轻烃管网调度优化模型。考虑到模型约束条件具有非连续性且模型规模庞大,引入相对罐容、连续参数、外输优先级等过渡变量,采用优先级算法对模型进行求解,并且通过改变连续参数来调整外输操作的连续性和紧迫性对外输优先级影响的比重,选择最优方案。同时,为了避免重复计算,预先求出满足约束条件的所有可能的启泵方案,整理成启泵方案列表,供模型求解时进行查找,提高了求解速度。所得方案与传统调度方式相比,启泵次数减少近45%,可以为现场优化输送调度提供指导。

Considering the fact that pumps frequently starts and stops under the intermittent transport mode of light hydrocarbon pipe network in Daqing Oilfield, an optimal scheduling model of light hydrocarbon pipe network is established with the timing synchronization method. The model considers the constraints including transport mode, hydraulic power, tank capacity within pump station and offtake flowrate at nodes, with the minimum pump-starting frequency in hydrocarbon pump stations within the study time period as objective function. Since the constraints are non-continuous and this model is huge in scale, some transition variables like relative tank capacity, continuous parameters and transport priority are introduced. Priority algorithm is adopted to solve the model, and the continuous parameters are changed to adjust the proportion that continuity and urgency of transport affect priority, to determine the optimal scheme. Meanwhile, to avoid repetitive computation, all possible pump-starting schemes meeting the constraint conditions are solved in advance and collected into a list for reference, by which the model can be solved more quickly. The proposed scheme, with pump-starting frequency nearly 45% less than traditional scheduling schemes, can provide guidance for optimization of field schedule.