基于数值模拟的流势分析技术在缝洞型油藏开发中的应用

doi:10.13809/j.cnki.cn32-1825/te.2020.02.014

摘要/Abstract

摘要：

油藏中流体所具有的能量决定流体流动方向,为研究缝洞型油藏流体能量分布规律,建立了缝洞型油藏流势理论模型,确定三维流体势表征方法。通过单洞底水、单洞边水、双洞底水、双洞边水4种典型缝洞结构的机理模型研究流势变化规律,并确定了5种影响流势调整效果的主控因素,最终结合流势分析技术开展了剩余油挖潜研究。结果表明：单洞底水模型进行流势调整,生产井受效最好;模型水体倍数为决定性因素,水体倍数小于10倍时调流势效果好;排液量越大,对于生产井控水效果越好。提出的数学模型能够真实地反映出地层中流体能量分布变化规律,结合流势分析技术提出了挖潜方案,应用于现场效果明显。

关键词: 缝洞型油藏, 流势调整, 三维流势场, 机理模型, 塔河油田

Abstract:

The energy of fluid in oil reservoir determines the direction of fluid flow. In order to study the energy distribution of fluid in fractured-vuggy reservoirs, a theoretical model of fluid potential is established, and the 3D fluid potential characterization method is determined. The mechanism models of four typical fractured-vuggy structures, single hole with bottom water, single hole with side water, double hole with bottom water and double hole with side water, are use to study the change rules of flow potential, and five main control factors affecting the flow potential adjustment effect are determined, finally, the research on potential tapping of residual oil was carried out in combination with flow potential analysis. The results show that the adjustment of flow potential for the model of single hole with bottom water make the production wells work best. The model’s water multiple is the decisive factor, and the flow potential regulation effect is better when the water multiple is less than 10 times. The greater the discharge, the better the effect of water control for production wells. The proposed fluid potential solving model of fractured and cavern reservoir can truly reflect the changing rules of fluid energy distribution in the actual formation.

Key words: fractured-vuggy reservoir, flow adjustment, 3D potential field, mechanism model, Tahe oilfield

中图分类号:

TE344

杜春晖,仇鹤,陈小凡等. 基于数值模拟的流势分析技术在缝洞型油藏开发中的应用[J]. 油气藏评价与开发, 2020, 10(2): 83-89.

Chunhui DU,He QIU,Xiaofan CHEN, et al. Application of flow potential analysis technique based on numerical simulation in the development of fractured-vuggy reservoir[J]. Reservoir Evaluation and Development, 2020, 10(2): 83-89.

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水侵方向	模型类型	调流势主控因素					调流势效果
水侵方向	模型类型	水体倍数	水体连通位置	排采比例	排采位置	排采井距	调流势效果
底水	单洞	≤20倍	水体连通远井	3∶1~5∶1	排低采高	近井部位	见效
		>20倍		> 7∶1	排低采高		见效
		50倍	水体连通中部	> 5∶1	排低采高		效果差
		50倍	水体连通近井	5∶1			负效
	双洞	≤20倍		3∶1~5∶1	排低采高		见效
	双洞	>20倍		> 10∶1			效果差
边水	单洞	≤20倍		3∶1~5∶1	排低采高	近井部位	见效
	单洞	>20倍		> 7∶1			见效
	双洞	≤10倍		3∶1~5∶1	排低采高		见效
	双洞	> 10倍		> 10∶1			效果差