单井化学示踪剂测残余油饱和度段塞解释模型

A Chemical Tracer Plug Interpretation Model for Well Residual Oil Saturation Test

提出了用于单井段塞式注入化学示踪剂测残余油饱和度的理论解释模型,即段塞解释模型。与以往脉冲式解释模型比较,该模型既符合矿场实际的注入条件,即段塞式注入,又不要求示踪剂是纯净的,使得示踪剂费用降低90%以上,适用于关井期间地下示踪剂带无显著飘移的矿场测试结果的解释。数值模拟表明,原始示踪剂与次生示踪剂回采剖面体积(称为滞留体积)的比值对扩散不敏感。该解释模型与数值模拟确定的残余油饱和度之间的误差小于0.5%;与单井的脉冲解释模型对比,解释精度提高2%.

This paper presents a chemical tracer plug interpretation model for well residual oil saturation. This model advantages over past pulse interpretation model in accordance with real injected conditions and wide tracer selections as well as much lower cost of used tracers. It can be used for interpretation of field test results from in-situ tracer zone without obvious drift in shut-in oil wells. The numerical simulation indicates that the hold-up volume ratio determined by recovery section between original tracer and secondary tracer is not sensitive to the tracer diffusion. Compared with past numerical simulation results, the difference of residual oil saturation given by these two methods could be less than 0.5%PV, and compared with well pulse interpretation model, 2% can be increased in interpreted precision using this model.