摘要
本文针对大庆油田厚油层高含水后期剩余油挖潜技术现状,提出了聚能移动调驱挖潜剩余油新理念。该技术以驱替流体转向分流做为剩余油主要驱替模式,这种驱替模式可以更有效地集中驱动能量,具有波及体积大,消耗能量低,驱油效率高等特点,拓展了高含水后期剩余油挖潜空间和能力。
一是以岩心可视化实验为基础,建立了流体转向分流理论。在两层非均质油层岩心模型上重点研究了聚驱和聚能移动调驱的流场特征,从封堵与分流角度阐述了分流转向基本原理;二是通过长方体非均质岩心实验,研究了聚能移动调驱宏观特征和内部压力场特征,揭示了岩心内部聚能移动压力场和流体转向分流的存在;三是应用数值模拟技术再现了可视化和长方体岩心实验主要结果,从流场和压力场角度研究了转向分流与聚能移动压力场伴生关系;四是研究了聚能移动调驱扩大波及体积和提高驱油效率机理,并应用正交实验分析法和数值模拟结合进行了聚合物聚能移动调驱敏感因素分析;五是围绕矿场应用,给出了选井选层方法和段塞设计原则,尤其提出了以动静态数据为基础分析地下流场非均质状况的方法和措施效果评价方法—驱替强度,为该技术的应用增添了活力。
通过上述研究,形成了一套完整的以流体转向驱动为主的高含水后期厚油层剩余油挖潜理论与技术,取得了驱油理念、流场认识、非均质识别方法、矿场设计等诸多方面的发展与创新。为大庆油田厚油层高含水后期剩余油挖潜提供了先进的理论支持和更有效实用技术,对维持大庆油田4000万吨产量有着极其重要的意义。
Considering the technology of tapping remaining oil at later stage of high water cut in Daqing oil field, a new idea of tapping remaining oil with gathered-energy moving controlled- profile flood(GEMCPF) has been proposed. This technology regards the diversion of flood fluid as the main model of displacing remaining oil, which can make the injecting energy effectively and then has the characteristics of less energy required, lager swept volume, and higher displacing efficiency to develop the capacity of tapping remaining oil at the later stage of high water cut.
Firstly, the theory of turning and diverting role of fluid has been established by visual experiment. That is, flowing field features of flooding with polymer or with GEMCPF have been researched mainly on the model of two-layer heterogeneous glass core, and the fundamental principle of flooding fluid diverting has been presented on the basis of sides of plugging and diversion. Secondly, according to laboratory experiments of cuboids heterogeneous core, the macro-feature and characteristics of inner pressure field of GEMCPF have been studied, and it is confirmed that gathered eneger moving pressure field and phenomenon of diverting are existing in the process of displacement. Thirdly, numerical simulation is used to show the results of visual and laboratory experiments again. And then, the association of diverting and gathered eneger moving pressure field is researched from the angle of flow field and pressure field. Fourthly, stimulating mechanisms of GEMCPF is researched. Moreover, the analyzing of the sensibility factors of GEMCPF for polymer by the means of orthogonal experiment combining with numerical simulation is presented. Fifthly, based on field application, the method of selecting wells, layers, and the principle of designing slug are given, especially a new analytical means about heterogeneity condition of subsurface flowing field with dynamic and steady data and the valuation method of the treatment. It enlivens the application of this technology.
Through the above research, a complete set of theory and technology to tap remaining oil of thick oil layer by diverted fluid at later stage of high water-cut has been established, and many innovative and developing achievements have been made such as displacement philosophy, knowledge of flow field, recognition method of heterogeneity, field design, and so on. It offers advanced theories and practical methods for displacing remaining oil for Daqing oil field, and has significant impacts on keeping the production level of 40000000tons in Daqing oil field.
引文
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