底水油藏鱼骨分支井见水动态特征

崔春雪; 刘曰武; 丁玖阁; 张国青; 任仰奇; 杨晓峰

doi:10.3969/j.issn.1006-6535.2025.02.008

特种油气藏 >

2025 , Vol. 32 >Issue 2: 66 - 72

DOI: https://doi.org/10.3969/j.issn.1006-6535.2025.02.008

油藏工程

底水油藏鱼骨分支井见水动态特征

崔春雪 ,
刘曰武 ,
丁玖阁 ,
张国青 ,
任仰奇 ,
杨晓峰

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1.中国科学院力学研究所,北京 100190;
2.中国科学院大学,北京 100190;
3.东北石油大学石油工程学院,黑龙江大庆 163318

崔春雪(1995—),女,助理研究员,2017年毕业于山东航空学院油气储运工程专业,2023年毕业于东北石油大学石油与天然气工程专业,获博士学位,现为中国科学院力学研究所博士后,主要从事油藏渗流及油井产能研究工作。

收稿日期: 2024-06-28

修回日期: 2025-01-05

网络出版日期: 2025-06-16

基金资助

国家自然科学基金“基于超声波作用促进低渗透油藏CO₂驱动态混相机理研究”(51974329);国家重大科技专项“CO₂促混转混调控技术研究——高效低成本促混转混体系研制及技术装置研究”(2024ZD1406601)

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Dynamic characteristics of water breakthrough of fishbone multilateral well in bottom water reservoirs

CUI Chunxue ,
LIU Yuewu ,
DING Jiuge ,
ZHANG Guoqing ,
REN Yangqi ,
YANG Xiaofeng

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1. Institute of Mechanics, Chinese Academy of Sciences, Beijing 100190, China;
2. University of Chinese Academy of Sciences, Beijing 100190, China;
3. School of Petroleum Engineering, Northeast Petroleum University, Daqing, Heilongjiang 163318, China

Received date: 2024-06-28

Revised date: 2025-01-05

Online published: 2025-06-16

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摘要

底水油藏开发过程中的底水锥进脊进问题严重制约了油藏的高效开发。针对该问题,以底水油藏鱼骨分支井为研究对象,运用渗流力学和油藏工程等理论方法,建立底水油藏底水锥进脊进动态预测模型,对见水时间及见水位置沿井筒轨迹的分布规律进行研究,明确鱼骨分支井的见水动态特征并对其进行敏感性分析。研究结果表明:受主井筒与分支井筒间的渗流干扰及分流作用影响,井筒汇合处附近的夹角区域内流率较低,在油层中垂向压力梯度较大,见水时间较早,随后主井筒的中间段以及靠近主井筒的各分支井筒跟端位置见水,主井筒的两端和各分支井的趾端位置见水时间相对较晩;增加避水高度、油水密度差、主井筒长度及分支夹角可有效减缓底水锥进脊进,主井筒长度超过400 m、分支角度超过30°时,见水时间增加幅度变缓;井筒高度位于油层厚度80%处较合理;重油油藏比轻质油藏更容易引起底水的脊进。研究成果对于油田矿场确定合理工作制度,延缓见水时间及提高无水累计产量和采收率具有重要实践指导意义。

关键词： 底水油藏; 鱼骨分支井; 锥进脊进; 见水动态

本文引用格式

崔春雪 , 刘曰武 , 丁玖阁 , 张国青 , 任仰奇 , 杨晓峰 . 底水油藏鱼骨分支井见水动态特征[J]. 特种油气藏, 2025 , 32(2) : 66 -72 . DOI: 10.3969/j.issn.1006-6535.2025.02.008

Abstract

The efficient development of bottom-water oil reservoirs is significantly constrained by the bottom-water coning during the development process.To address this issue,the study focused on the fishbone multilateral wells in bottom-water oil reservoirs and established a dynamic prediction model for the bottom-water coning by applying theoretical methods from fluid mechanics in porous medium and reservoir engineering to investigate the distribution pattern of water breakthrough time and position along the wellbore trajectory,thus clarifying the dynamic characteristics of water breakthrough in fishbone multilateral wells and conducting a sensitivity analysis.The study results show that:the interflow interference and diversion effects between the main wellbore and multilateral wellbores result in lower flow rates in the angular region near the wellbore junction,where a larger vertical pressure gradient in the reservoir leads to earlier water breakthrough.Subsequently,the middle section of the main wellbore and the heel ends of the multilateral wellbores near the main wellbore experience water breakthrough,while the ends of the main wellbore and the toe ends of the multilateral wellbores have relatively later water breakthrough times.Increasing the water-shutoff height,oil-water density difference,main wellbore length,and branch angle can effectively mitigate the bottom-water coning/cresting.When the main wellbore length exceeds 400 m and the branch angle exceeds 30°,the increase in water breakthrough time slows down.It is more reasonable to position the wellbore height at 80% of the reservoir thickness.Heavy oil reservoirs are more prone to bottom-water cresting compared to light oil reservoirs.The research results provide significant practical guidance for oilfields to determine reasonable operating policies,delay water breakthrough time,and enhance water-free cumulative production and recovery efficiency.

Key words： bottom water reservoir; fishbone multilateral well; coning/water cresting; water breakthrough dynamic

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