缝洞型油气藏室内试井模拟实验研究

针对塔里木油田缝洞型碳酸盐岩油气藏,运用相似理论,在室内采用大型中间容器模拟溶洞,填砂细管模拟裂缝,设计了单溶洞、单缝单洞、串联双溶洞和串并复合几种室内实验模型,并使用高精度压力监测仪和流量计分别记录节点压力与气体流量,根据计算机采集的压力恢复数据,绘制压力恢复试井的双对数曲线。实验结果表明,双对数曲线大致反映了3个流动过程,即前期井储效应过程,裂缝流动过程,溶洞流动过程,其中凹子反映了压力波在溶洞内的来回扰动过程。因此,该室内模拟实验能够准确反映流体在裂缝和溶洞中的流动情况,从而为现场试井解释提供可靠依据。

The well testing experiment of fractured-vuggy reservoir

A large middle container was adopted to simulate the cave, and sand filling tube was applied to simulate the crack with similarity theory in the Tarim Oilfield seam cavern type carbonate reservoir. then several models, such as single cavern, a crack and a cave model, parallel double cavern model and series parallel model, were designed with the cave and crack. After that the experiments were conducted with the models using a high precision pressure monitor to record the pressure and flow rate. According to the recovery data of pressure collected by computer, the double logarithm curve of pressure recovery test was drawn. The experimental results showed that the double logarithmic curve can reflect three flowing processes, namely the process of well storage effect process, the flow of crack, the flow of cave, and the caviton reflected the disturbance of pressure wave in the concave cavity. Therefore, the indoor simulation experiment can accurately reflect the flow of fluid in the cracks and caves and provide a reliable basis for well testing interpretation.