郑宪宝,何宇航,王志强,邵帅,金凌萱,李汝斌
ZHENG Xianbao,HE Yuhang,WANG Zhiqiang,SHAO Shuai,JIN Lingxuan,LI Rubin

• 1:中国石油大庆油田有限责任公司勘探开发研究院
• 2:国家能源陆相砂岩老油田持续开采研发中心

摘要(Abstract)：

针对传统微观剩余油分类受力机制不清、剩余油赋存状态驱动力不明确的问题，采用驱替协同CT扫描手段、微尺度流动模拟技术，开展基于受力特征的微观剩余油分类方法和动用机制研究，通过基于驱替实验数据的力学参数优选和分类界限划分构建了微观剩余油成因分类方法，将微观剩余油划分为毛细管压力+黏滞力控制团簇型（A型）、毛细管压力+黏滞力控制油滴型（B型）、黏滞力控制油膜型（C型）、毛细管压力控制喉道型（D型）、黏滞力控制盲端型（E型）共5种类型；搞清了高倍水驱冲刷后河道砂体微观剩余油赋存状态，其中大型河道砂体微观剩余油以B型为主，分布在高连通大孔中；中小型河道砂体微观剩余油以A型为主，主要分布在高连通中小孔隙中；同时还明确了增加压力梯度、提高剪切力、降低毛细管压力等微观剩余油动用机理。研究成果为特高含水后期的剩余油深度挖潜创造了技术条件。
Aiming at the unclear force mechanism in traditional microscopic remaining oil classification and the ambiguous driving force of remaining oil occurrance,research on microscopic remaining oil classification method and the producing mechanism based on the force characteristics is conducted via displacement coordinated CT scanning method and micro-scale flow simulation technique. Through the optimization of mechanical parameters and the division of classification limits based on displacement experimental data, a method for genisis classification of microscopic remaining oil is established to divide microscopic remaining oil into 5 types, including capillary pressure+ viscous force controlled cluster type(Type A), capillary pressure+ viscous force controlled oil-droplet type(Type B), viscous force controlled oilfilm type(Type C), capillary pressure controlled throat type(TypeD)and viscous force controlled blind end type(Type E). Occurrence state of microscopic remaining oil in channel sand bodies after high-multiple water flooding is clarified. Among them, microscopic remaining oil in large-sized channel sand body is dominated by Type B, which is distributed in macropores with high connectivity.Microscopic remaining oil in medium and small-sized channel sand body is dominated by Type A, which is mainly distributed in micropores and mesopores with high connectivity. Mechanisms for microscopic remaining oil production such as increasing pressure gradient, increasing shear force and reducing capillary resistance are also clarified. The research provides technical conditions for deep potential tapping of remaining oil in late stage of ultra-high water cut.

关键词(KeyWords)： 河道砂体;驱替协同CT扫描实验;微观剩余油;赋存状态;特高含水后期;动用机理
channel sandbody;displacement coordinated CT scanning experiment;microscopic remaining oil;occurrence state;late stage of ultra-high water cut;producing mechanism

Abstract:

Keywords:

基金项目(Foundation): 中国石油天然气股份有限公司攻关性应用型科技专项“中高渗油田特高含水期大幅度提高采收率技术研究”(2023ZZ22)

作者(Author): 郑宪宝,何宇航,王志强,邵帅,金凌萱,李汝斌
ZHENG Xianbao,HE Yuhang,WANG Zhiqiang,SHAO Shuai,JIN Lingxuan,LI Rubin

DOI: 10.19597/J.ISSN.1000-3754.202504072

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