拟示踪剂在凝析油注采研究中的应用

Application of Virtual Tracer Method in the Study of Condensate Oil Injection-production Process

凝析油回注是海上油气田开发过程中为应对海底输油管线故障而采取的一种工程应急措施。海上油气田输油管道出现故障后,油井被迫全部关停,气井照常生产,气井产生的凝析油无法处理,只能回注油层。通过回注井筛选确定回注可行性并选择合适的回注井;通过试验研究明确回注对地层产生的影响;通过拟示踪剂法对凝析油注采过程进行分析,研究凝析油渗流范围,分析凝析油对地层渗流的影响,确定不同液量的凝析油回采率。研究结果符合实际,准确可靠,对后续海上油气田的凝析油回注具有借鉴和参考意义。

Condensate oil reinjection was an engineering contingency measure for the development of offshore oil and gas fields when the offshore oil transportation pipeline was broken down.At that time,all the oil wells were shut down,but all the gas wells were still produced and the produced condensate oil was incapable for handling,the only way to deal with it was to reinject it back into the reservoir.The feasibility of reinjection and suitable reinjection wells were determined by selecting reinjection wells.Based on experimental investigation,the influence of condensate oil reinjection on the formation was explicated.The condensate oil injection-production process,the seepage scope of condensate oil,the influence on the formation seepage and its recovery rate at different fluid volumes were studied by applying the virtual tracer method.Study results show that the virtual tracer method is practical,accurate and reliable.The new method provides reference for condensate oil reinjection in the subsequent offshore oil and gas fields.