梁潇,姜毅,暴赫,李景玲,王迪
Liang Xiao,Jiang Yi,Bao He,Li Jingling,Wang Di

• 1:中海石油(中国)有限公司天津分公司渤海石油研究院

摘要(Abstract)：

为了解决油田高含水开发阶段连续注水面临的注入水无效循环加剧、驱替效率降低等问题，基于压力扩散方程模型、多相弹性储能模型、多场耦合数学模型，开发了融合多场耦合效应的数值模拟软件，在此基础上开展了不稳定注水提高采收率研究。结果表明：不稳定注水提高采收率的成因是压力波动形成动态压力梯度打破了油水平衡，弹性力通过储能-释能循环，提供了附加动力；不稳定注水提高采收率的静态影响因素为储层非均质性、天然水体能量，动态影响因素为压力波动幅度、注采半周期时长、注采交替方式；Q油田高含水复杂河流相稠油藏优化注采方案为压力波动幅度取原始压力的10%、注采半周期为90 d、采用油水井异步注采方式，优化后的注采方案可实现井组日增油量11.5～14.6 m~3。研究成果可为高含水老油田提高采收率提供了可靠理论与技术。
In order to solve the problems of aggravated ineffective water cycling and decreased displacement efficiency encountered in continuous water injection during high water-cut development stage of oilfields, based on the pressure diffusion equation model, multiphase elastic energy storage model and multi-field coupling mathematical model, a numerical simulation software integrating multi-field coupling effects is developed to study unsteady water flooding for enhanced oil recovery(EOR). The results show that, unsteady water flooding is proposed herein to break oil-water balance through dynamic pressure gradients generated by pressure fluctuations, while elastic force provides additional driving force via an energy storage-release cycle. Static factors influencing the recovery of unstable water flooding are reservoir heterogeneity and natural water body energy, while dynamic factors include pressure fluctuation amplitude, injection-production half-cycle duration, and injection-production alternation mode. For high water-cut complex fluvial heavy oil reservoir in Q Oilfield, the optimized scheme involves a pressure fluctuation amplitude of 10% of the original pressure, an injection-production half-cycle of 90 days, and an asynchronous injection-production pattern between oil and water wells, with daily oil production increased by 11.5-14.6 m~3 per well pattern. The research provides reliable theory and technology for EOR in high water-cut mature oilfields.

关键词(KeyWords)： 高含水;不稳定注水;提高采收率;数值模拟;剩余油挖潜;流固耦合
high water cut;unsteady water flooding;enhanced oil recovery;numerical simulation;remaining oil potential tapping;fluid-solid coupling

Abstract:

Keywords:

基金项目(Foundation): 中国海洋石油有限公司“十四五”重大科技项目子课题“油气生产智能化技术——智能注采技术”（KJGG-2022-15-0303）

作者(Author): 梁潇,姜毅,暴赫,李景玲,王迪
Liang Xiao,Jiang Yi,Bao He,Li Jingling,Wang Di

DOI: 10.19597/J.ISSN.1000-3754.202509062

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