致密油藏压驱动态裂缝模型建立及应用

doi:10.3969/j.issn.1006-6535.2023.04.011

摘要/Abstract

摘要： 针对常规油藏数值模拟软件不能精确模拟致密油压驱注水开发过程中裂缝扩展延伸的问题,基于压驱开发过程中动态裂缝扩展规律,将裂缝扩展模型与致密油藏油水两相渗流模型有机耦合,建立了压驱注水模型,并采用有限差分法求解。将模型用于某油田X8井组“五点法”注采井网,研究高速恒定排量与阶梯增加排量下压驱开发的生产动态特征。结果表明:注入排量与裂缝延伸速度呈正相关;同一注入排量下,注水井近井地带裂缝延伸速度较快;动态裂缝使压力和注入水沿着裂缝延伸方向传播;在采用五点法井网且累计注水量均为3×10⁴m³的情况下,采用阶梯增加排量压驱方式与高速恒定排量压驱方式相比,裂缝延伸长度增加了11.9 m,油水前缘位置运移滞后了4.2 m,对应角井见效时间晚5 d,见水时间晚31 d,阶段采出程度提高0.45个百分点;阶梯增加排量压驱方式改善了注入水波及面积,延缓了采油井见水时间,改善了油藏的开发效果。研究内容可为致密油藏压驱开发注水设计提供技术支撑。

关键词: 致密油藏, 压驱, 裂缝扩展, 数值模拟

Abstract: To address the problem that conventional reservoir numerical simulation software cannot accurately simulate the fracture propagation during the development of pressure drive water injection of tight oil; based on the dynamic fracture propagation law during the development of pressure drive, the fracture propagation model is organically coupled with the oil-water two-phase seepage model of tight oil reservoir, a pressure drive water injection model was established, and the problem was solved by the finite difference method. The model was applied to the five-point injection and recovery well network of Well Cluster X8 in an oilfield to study the production dynamic characteristics of pressure drive development under high-speed constant displacement and step increasing displacement. The result shows that the injection displacement is positively correlated with the fracture propagation velocity; under the same injection displacement, the fracture propagation speed in the near-wellbore zone of the water injection well is faster; dynamic fracture made the pressure and injected water propagate along the fracture propagation direction; in a five-spot pattern well network with a cumulative injection volume of 3×10⁴m³, compared with the step increasing displacement with high-speed constant displacement method, the fracture propagation length is increased by 11.9 m, and the oil-water front edge migration lags by 4.2 m; corresponding to corner wells, the effective time was 5 days later, the water breakthrough time was 31 days later, and the staged recovery degree was 0.45 percentage points higher; the step increasing displacement pressure drive method improved the affecting area of the injected water, delayed the water breakthrough time of the production well, and improved the development effects of the reservoir. The research results can provide technical support for pressure drive development water injection design of tight reservoirs.

Key words: tight reservoir, pressure drive, fracture propagation, numerical simulation

中图分类号:

TE349

崔传智, 王俊康, 吴忠维, 隋迎飞, 李静, 陆水青山. 致密油藏压驱动态裂缝模型建立及应用[J]. 特种油气藏, 2023, 30(4): 87-95.

Cui Chuanzhi, Wang Junkang, Wu Zhongwei, Sui Yingfei, Li Jing, Lu Shuiqingshan. Establishment and Application of Pressure Drive Dynamic Fracture Model for Tight Oil Reservoirs[J]. Special Oil & Gas Reservoirs, 2023, 30(4): 87-95.

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