南梁长4+5低渗透油藏注水伤害机理

余琦昌; 牛海洋; 吕泽宇; 吴贝贝; 辛元丹; 赵涛

doi:10.3969/j.issn.1006-6535.2022.04.017

特种油气藏 >

2022 , Vol. 29 >Issue 4: 120 - 127

DOI: https://doi.org/10.3969/j.issn.1006-6535.2022.04.017

油藏工程

南梁长₄₊₅低渗透油藏注水伤害机理

余琦昌 ,
牛海洋 ,
吕泽宇 ,
吴贝贝 ,
辛元丹 ,
赵涛

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1.中国石油长庆油田分公司,陕西西安 710200;
2.重庆科技学院,重庆 401331

余琦昌(1986—),男,工程师,2011年毕业于中国石油大学(北京)地质工程专业,现主要从事油田开发工作。

收稿日期: 2022-01-10

修回日期: 2022-05-10

网络出版日期: 2023-01-09

基金资助

国家科技重大专项“鄂尔多斯盆地致密油开发示范工程”(2017ZX05069)

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Study on Damage Mechanism of Water Flooding to Chang₄₊₅ Low-permeability Reservoirs, Nanliang Area

Yu Qichang ,
Niu Haiyang ,
Lyu Zeyu ,
Wu Beibei ,
Xin Yuandan ,
Zhao Tao

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1. PetroChina Changqing Oilfield Company, Xi'an, Shaanxi 710200, China;
2. Chongqing University of Science & Technology, Chongqing 401331, China

Received date: 2022-01-10

Revised date: 2022-05-10

Online published: 2023-01-09

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摘要

针对南梁长₄₊₅低渗透油藏注水开发过程中地层伤害机理认识不清的问题,利用电镜扫描、铸体薄片、共聚焦成像、XRD等实验方法,分析了水驱前后储层岩心的孔隙结构及岩石组成,明确注水开发对储层孔隙特征的影响,通过注入水与地层水矿化度与物质含量对比,分析注水过程的潜在伤害、岩心渗透率的实时变化规律,总结地层结垢堵塞机理。结果认为:南梁长₄₊₅油藏注水地层伤害机理主要为注入水、地层水、储层的不配伍引发的盐敏、结垢,以及注入水水质较差引起的储层机械杂质堵塞。该研究成果为低渗透油藏注水伤害机理认识提供了方法及理论支撑。

关键词： 低渗透油藏; 注水; 配伍性; 地层伤害; 结垢

本文引用格式

余琦昌 , 牛海洋 , 吕泽宇 , 吴贝贝 , 辛元丹 , 赵涛 . 南梁长₄₊₅低渗透油藏注水伤害机理[J]. 特种油气藏, 2022 , 29(4) : 120 -127 . DOI: 10.3969/j.issn.1006-6535.2022.04.017

Abstract

In response to poor understanding of formation damage mechanism in the process of water flooding development of Chang₄₊₅ low permeability reservoirs, Nanliang Area, experimental methods such as electron microscopy scanning, casting slice, confocal imaging and XRD were utilized to analyze the pore structure and rock composition of reservoir cores before and after water flooding, determine the effect of water flooding development on reservoir pore characteristics, analyze the potential damage, real-time variation pattern of core permeability in water flooding process by comparison of the salinity and material contents between injected water and formation water, and summarize the mechanism of formation fouling and blockage. The results concluded that the damage of water flooding to Chang₄₊₅ low permeability reservoir, Nanliang Area mainly included salt sensitivity and scaling caused by the incompatibility among injected water, formation water and reservoir, as well as the blockage of mechanical impurities in the reservoir caused by the poor quality of injected water. The study results provide methodological and theoretical support for understanding the damage mechanism of water flooding to low permeability reservoirs.

Key words： low permeability reservoir; water flooding; compatibility; formation damage; scaling

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