水平井蒸汽辅助重力驱物理模拟相似准则及应用

针对水平井蒸汽辅助重力驱,在建立沿水平井井筒方向上有质量和能量损失的一维多相管流数学模型的基础上,利用相似理论中的方程分析法和量纲分析法推导出了水平井蒸汽辅助重力驱的34个相似准则数,并总结、重新组合出6个主要相似准则数。选用辽河油田现场数据,利用推导出的主要相似准则数群计算得到了高压比例模型的模型参数,并利用该高压比例模型,通过室内三维物理模拟试验优选注采参数。试验结果表明,蒸汽干度和注蒸汽速度是影响水平井蒸汽辅助重力驱成功与否的主要因素,必须保证较高的蒸汽干度和注蒸汽速度,最佳注蒸汽速度建议维持为采液速度的0.67~0.83倍(采注比1.2~1.5)。

THEORY AND APPLICATION OF THE SCALING LAWS FOR PHYSICAL MODELING FOR HORIZONTAL WELL STEAM ASSISTED GRAVITY FLOODING

On the basis of establishing 1-D multi-phase conduit flow mathematical model along the direction of well bore of horizontal well, this paper derives 34 similar parameters of horizontal well SAG flooding utilizing equation analysis and dimension analysis method in similarity theory, to summarize and regroup 6 main similar numbers. Through Selecting Liaohe oilfield practical data, 3-D high pressure scale physical model for simulating horizontal well SAG flooding is established by using the deduced 6 main similar numbers. With this model experiment, SAG flooding injection-production parameters optimization can be achieved through Laboratory tests. The results of the experiments show that steam dryness and injection rate is the major factor in the success of SAG flooding, which should be maintained in a high level. Best steam injection rate is suggested to be maintained approximately 0.67~0.83 times as much as the liquid production rate.