稠油油藏蒸汽吞吐井注采参数系统优化

Optimization of steam stimulation injection-production parameter system in heavy oil

蒸汽吞吐热力采油的效果取决于由注采参数决定的注入蒸汽的热能利用程度。将蒸汽在地面管线、井筒及地层中的流动作为一个整体系统 ,在地面、井筒管流及油藏数值模拟研究的基础上 ,基于节点分析技术 ,建立蒸汽吞吐注入系统组合模型 ,提出蒸汽吞吐井注采参数整体系统优化的设计方法。考虑蒸汽吞吐井的注入、采出费用建立经济评价模型 ,用模拟退火算法优化注采参数。应用结果表明 ,采用此方法优选出的参数进行生产 ,可提高蒸汽吞吐井的热能利用率和开采效果。图 2表 2参

The level of oil production using steam injection technique directly depends on the heat efficiency of steam injection, and the heat efficiency can be determined by injection-production parameters. By treating steam flow in surface pipeline, in the borehole, and within the rock formation as a system, this study establishes an integrated mathematical model of steam injection system, and a new method of optimization design of steam stimulation injection-production parameters. In this integrated model, the wellhead and well bottom are treated as nodes, and a nodal analysis technique is applied to integrate surface pipeline flow, well-bore flow and formation seepage flow. The optimization design method takes into consideration the cost of steam injection and fluid production in the steam stimulation well, and forms the basis of an economic evaluation model. Simulated annealing to global optimization problem is introduced to optimize the injection-production parameters. The results suggest that operations based on the optimal injection-production parameters designed by this method lead to an increase in heat efficiency and recovery rate of steam stimulation wells.