海上油田井间示踪测试示踪剂用量设计优化

Optimization of tracer dosage in the process of inter well tracer test in offshore oilfield

井间示踪测试中示踪剂用量设计最常用的方法是总稀释模型和Brigham-Smith模型。详细分析了两种模型的优缺点,总稀释模型无法控制示踪剂的产出峰值浓度,而Brigham-Smith模型具有只适用于五点井网和未考虑井组外的稀释作用两个局限性,并且模型中的弥散常数和峰值浓度两个参数具有不确定性。结合海上油田井间示踪测试的矿场实践经验,考虑注采系统完善程度的影响,提出了优化设计模型,并针对井组外注入水的稀释效应对设计结果进行修正。新的用量设计模型应用于海上油田20余井组的井间示踪测试,计算简便,适应性显著。

The most common design methods of tracer dosage in the process of inter well tracer test are total dilution model and Brigham-Smith model. The advantages and disadvan- tages of two models are analyzed in detail. Total dilution model can not control the peak concentration value of tracer production. However, Brigham-Smith model can only be used in five-spot well pattern and ignores the dilution effect of water outside the well group. Two parameters of this model, diffusion constant and peak concentration, have uncertainty. Com- bining the inter well tracer test practical experience in offshore oilfield, an optimized design model is proposed, which considers the effect of completion level of injection-production system. The new model is then corrected based on the dilution effect of water outside the well group. The new dosage design model was used in 20 wells tracer test in offshore oil- field, conveniently calculated and showing its adaptability.