吴德君, 侯健, 刘丽杰, 周康, 安志斌. 不同类型油藏非均相驱均衡驱替方式及效果评价[J]. 工程科学学报. DOI: 10.13374/j.issn2095-9389.2024.05.13.003
引用本文: 吴德君, 侯健, 刘丽杰, 周康, 安志斌. 不同类型油藏非均相驱均衡驱替方式及效果评价[J]. 工程科学学报. DOI: 10.13374/j.issn2095-9389.2024.05.13.003
Balanced displacement methods and effect evaluation of heterogeneous combination flooding in different reservoirs[J]. Chinese Journal of Engineering. DOI: 10.13374/j.issn2095-9389.2024.05.13.003
Citation: Balanced displacement methods and effect evaluation of heterogeneous combination flooding in different reservoirs[J]. Chinese Journal of Engineering. DOI: 10.13374/j.issn2095-9389.2024.05.13.003

不同类型油藏非均相驱均衡驱替方式及效果评价

Balanced displacement methods and effect evaluation of heterogeneous combination flooding in different reservoirs

  • 摘要: 非均相驱协同矿场调整措施在孤岛油田中一区Ng3单元取得了良好的降水增油效果。然而,由于实际地层非均质性复杂、层间井网部署的差异及不同层位化学剂注入量不同,非均相驱动用平面和纵向分布的剩余油的过程中会相互影响,很难明确不同方式均衡驱替贡献力度,难以阐明不同类型剩余油的动用机制。为此,本文采用数值模拟方法,基于目标区块实际地层参数,建立了五种不同类型剩余油油藏机理模型,通过受效剩余油分布、洗油效率、波及系数、平面含水饱和度变异系数及纵向吸水不均衡系数等指标,评价了非均相驱平面及纵向均衡驱替效果,并阐明了剩余油动用机制。数值模拟研究表明,非均相驱协同井网调整或分层配注等矿场调整措施,能最大程度扩大波及、提升均衡驱替效果。针对不同类型剩余油油藏,明确了均衡驱替方式贡献力度及实施优先级,实际应用时应根据油藏类型和矿场实施条件,选取适宜的均衡驱替方式。本研究为矿场非均相驱动用不同类型剩余油提供了合理的解释,对不同类型油藏未来进一步矿场推广应用提供参考意义。

     

    Abstract: The synergistic oil production of heterogeneous combination flooding and field adjustment measures has achieved good effects of oil production increase and water cut decrease in the Ng3 block of the Gudao Oilfield. However, due to the complex heterogeneity of the actual formation, differences in the deployment of interlayer well networks, and different injection volume of chemical agents in different layers, the extraction of planar and vertical remaining oil by heterogeneous combination flooding will be affected. It is difficult to clarify the contribution of different balanced displacement methods, and to elucidate the mechanism of extracting different types of remaining oil. Therefore, this paper establishes five different types of remaining oil reservoir mechanism models based on the actual formation parameters of the target block through reservoir numerical simulation. The remaining oil, extracted remaining oil, oil displacement efficiency, sweep coefficient, planar water saturation variation coefficient, and vertical water absorption imbalanced coefficient were used to evaluate the balanced displacement effects of heterogeneous combination flooding. On this basis, the mechanism of remaining oil extraction was elucidated. The numerical simulation results show that field adjustment measures such as well network adjustment or layered injection allocation for heterogeneous combination flooding can maximize the balanced displacement effect. For different types of remaining oil reservoirs, the priority of implementing balanced displacement methods has been clarified. In practical application, suitable balanced displacement methods should be selected based on the type of reservoir and the conditions of the field implementation. In reservoirs with developed high permeability zones, heterogeneous combination flooding can effectively advantageous channels of water flow; Well network infilling can enlarge the sweep volume of heterogeneous combination flooding in low-permeability areas and enhance the displacement efficiency of enriched remaining oil. The balanced displacement effect of heterogeneous combination flooding is better than that of well network adjustment. In reservoirs with imperfect injection production well networks, improvement of the well network can increase the sweep range of streamlines, and synergistic heterogeneous combination flooding can dynamically regulate and strengthen the extraction of remaining oil. The balanced displacement effect of well network adjustment is better than that of heterogeneous combination flooding. In unconnected reservoirs, the enriched remaining oil blocked by faults is difficult to connect with production wells. So well network adjustment can effectively overcome the blocking effect of faults and extract unconnected remaining oil. The balanced displacement effect of well network adjustment is better than heterogeneous combination flooding. In rhythmic reservoirs, injected fluids are prone to flow along high permeability water flooded intervals. Heterogeneous combination flooding can effectively plug them, thereby increasing the water absorption of weak water flooded low permeability intervals and extracting high saturation remaining oil. In interbed reservoirs, layered water injection can significantly improve the vertical water absorption imbalance degree. Heterogeneous combination flooding further plays a role in conformance control and oil displacement at different layers, enhancing sweep effect and improving oil displacement efficiency, effectively extracting the remaining oil controlled by interbeds. The effect of heterogeneous combination flooding on improving balanced displacement is better than that of layered water injection, and layered allocation of heterogeneous combination flooding can achieve vertical balanced displacement to the maximum extent. This study provides a reasonable explanation for extracting different types of remaining oil and achieving balanced displacement for heterogeneous combination flooding, and affords reference significance for the future promotion and field application in different reservoirs.

     

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