示踪井测试的新解释技术

K. M. Fedorov, A. Shevelev, A. Y. Gilmanov, A. A. Izotov, A. V. Kobyashev
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引用次数: 0

摘要

背景。示踪井测试是上个世纪提出的一种详细制定储层模型的方法。这种试验意味着在注入井中注入弱吸附示踪剂,然后在附近的生产井中收集和分析样本。试验结果被认为可以阐明油井的连通性和井间水力传导性。然而,这些试验的实际应用表明,示踪剂渗入生产井的速度远远快于对储层特性的估计。开发一种解释示踪剂井测试结果的新技术。在考虑传质参数的情况下,模拟示踪剂沿自致水力裂缝移动的过程。开发的示踪研究结果解释算法在西西伯利亚的一个矿床中进行了测试。富集区位于侏罗纪瓦修干地层。浓度为 9% 的硫代甲酰胺水溶液被用作示踪剂。在 XX72、XX73、XX75、XX76、XX77 和 XX78 六口反应生产井中进行了 75 天的测量。在此期间,共采集了 516 个样本。在前三天,以相同的时间间隔提取了 36 个样本;在随后的两周,同样以相同的时间间隔提取了 90 个样本;在剩下的日子里,每口井每周进行 2-3 次测量。根据为所有水井制定的方法对研究结果进行了解释。对示踪液滴沿裂缝移动的问题进行了数值和分析求解。其中考虑到了流体与地层之间的传质以及示踪弹的耗散。这一解决方案被用作解释示踪井测试结果的新技术的基础,从而可以确定更多的裂缝参数。在实践中应用了所开发的技术断裂参数测定技术。结果表明,存在多条连接注水井和生产井的裂缝。可以确定,这种裂缝在储层中的形成过程仍在进行中。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
New interpretation technique for tracer well tests
Background. Tracer well tests were proposed in the last century as an approach for elaboration of detailed reservoir models. Such tests implied injecting weakly adsorbable tracers into an injection well followed by collection and analysis of samples in nearby production wells. The results were assumed to clarify well connectivity and inter-well hydraulic conductivity. However, practical application of these tests showed that the tracer penetrates into the production well much faster than predicted from estimates of the reservoir properties.Aim. To develop a new technique for interpreting the results of tracer well tests.Materials and methods. The process of tracer movement along a self-induced hydraulic fracture was simulated taking into account the mass transfer parameter. The developed algorithm for interpreting the results of tracer studies was tested in a deposit located in Western Siberia. The productive interval is located in the Jurassic interval of the Vasyugan Formation. An aqueous solution of thiocarbamide with a concentration of 9% was used as a tracer. Injection was carried out through injection well XX74 for 3 h. The mass of the injected tracer was 1 t. Measurements in six reacting production wells XX72, XX73, XX75, XX76, XX77, and XX78 were conducted for 75 days. During this time period, 516 samples were collected. In the first three days, 36 samples were extracted at equal time intervals; in the following two weeks, 90 samples were extracted also at equal time intervals; during the remaining days, measurements were conducted 2—3 times per week for each well. The results of the conducted studies were interpreted based on the developed methodology for all the wells.Results. A numerical and analytical solution of the problem of tracer slug movement along the fracture was obtained. Account was taken of the mass transfer between the fluids and the layer, as well as the dissipation of the tracer slug. This solution was used as the basis for a new technique for interpreting the results of tracer well tests, which allows a greater number of fracture parameters to be determined.Conclusion. The developed technique for determining the parameters of technogenic fractures was applied in practice. The presence of several fractures connecting injection and production wells is shown. It is established that the process of formation of such fractures in the reservoir is still ongoing.
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