潜山油藏CO2重力混相驱作用机制与驱油实验

郭发军; 梁飞; 陈洪; 齐桓; 曾庆桥; 王睿思; 李宜强; 吴永恩

doi:10.3969/j.issn.1006-6535.2025.01.011

特种油气藏 >

2025 , Vol. 32 >Issue 1: 98 - 105

DOI: https://doi.org/10.3969/j.issn.1006-6535.2025.01.011

油藏工程

潜山油藏CO₂重力混相驱作用机制与驱油实验

郭发军 ,
梁飞 ,
陈洪 ,
齐桓 ,
曾庆桥 ,
王睿思 ,
李宜强 ,
吴永恩

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1.中国石油华北油田分公司,河北沧州 061000;
2.中国石油辽河油田分公司,辽宁盘锦 124000;
3.中国石油大学(北京)油气资源与工程全国重点实验室,北京 102249;
4.中国石油大学(北京)石油工程学院,北京 102249

郭发军(1971—),男,教授级高级工程师,1995年毕业于成都理工学院石油工程专业,现主要从事油气田开发技术研究工作。

收稿日期: 2023-12-06

修回日期: 2024-11-11

网络出版日期: 2025-05-13

基金资助

中国石油科技项目“华北八里西潜山油藏碳驱油碳埋存先导试验”(2023YQX10407ZK)

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Mechanism of CO₂ gravity miscible displacement and oil displacement experiment in buried hill reservoirs

GUO Fajun ,
LIANG Fei ,
CHEN Hong ,
QI Huan ,
ZENG Qingqiao ,
WANG Ruisi ,
LI Yiqiang ,
WU Yongen

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1. PetroChina Huabei Oilfield Company,Cangzhou,Hebei 061000, China;
2. PetroChina Liaohe Oilfield Company,Panjin,Liaoning 124000, China;
3. State Key Laboratory of Oil and Gas Resources and Engineering,China University of Petroleum (Beijing),Beijing 102249, China;
4. College of Petroleum Engineering,China University of Petroleum (Beijing),Beijing 102249, China

Received date: 2023-12-06

Revised date: 2024-11-11

Online published: 2025-05-13

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摘要

针对冀中坳陷八里西裂缝型潜山油藏实施CO₂重力驱作用机理不明的问题,综合考虑储层特征及开发现状,开展注气膨胀、岩心驱替及核磁扫描实验,探讨储层流体与CO₂间的相互作用机制,研究油藏底部注水后实施CO₂重力驱效果,明确孔、缝储集空间内原油的动用规律。研究表明:注入CO₂后,原油黏度降低57%,体积膨胀1.83倍,CO₂具有较好的原油降黏膨胀效果;PVT实验结果表明,水相的存在几乎不影响原油与CO₂间的相互作用;在油气传质过程中CO₂可萃取、抽提出油中的C₂—C₁₂组分,利于轻质组分的采出,较重组分(C₁₀—C₃₆₊)滞留其中;油藏底部注水后实施CO₂重力驱能够进一步提高原油采收率,油气传质程度与注气速度均会影响驱油效果,油气传质程度越强、注入速度越低,越能发挥CO₂萃取、抽提与溶解能力,充分动用连片剩余油以及与CO₂未直接接触的剩余油;根据核磁实验结果可将储集空间划分为孔隙空间和裂缝空间,与CO₂非混相驱相比,水驱后CO₂重力混相驱能够提高基质与裂缝中原油的采出程度,混相驱2.0倍孔隙体积后,基质部分采出程度为49.3%,裂缝部分采出程度为99.3%。现场实践表明,顶部注CO₂重力混相驱油是八里西潜山油藏有效提高采收率的接替开发手段。

关键词： CO₂重力混相驱; CCUS; 潜山油藏; 作用机制; 驱油特征; 在线核磁

本文引用格式

郭发军 , 梁飞 , 陈洪 , 齐桓 , 曾庆桥 , 王睿思 , 李宜强 , 吴永恩 . 潜山油藏CO₂重力混相驱作用机制与驱油实验[J]. 特种油气藏, 2025 , 32(1) : 98 -105 . DOI: 10.3969/j.issn.1006-6535.2025.01.011

Abstract

To address the unclear mechanism of CO₂ gravity flooding implemented in Balixi fracture-type buried hill reservoir,this paper,considering the reservoir characteristics and development status,explored the interaction mechanisms between reservoir fluids and CO₂ through the gas injection expansion,core displacement,and NMR scanning experiments,and studied the effect of CO₂ gravity flooding after water injection at the bottom of the reservoir,clarifying the production patterns of crude oil within the pore and fracture reservoir spaces.The study shows that:after the injection of CO₂,the viscosity of crude oil is reduced by 57%,and its volume is expanded by a factor of 1.83,indicating that CO₂ has a significant effect on reducing the viscosity and expanding the volume of crude oil.The results of PVT (Pressure-Volume-Temperature) experiments indicate that the presence of a water phase has almost no effect on the interaction between crude oil and CO₂.During the oil-gas mass transfer process,CO₂ can extract and strip the C₂-C₁₂ components from the oil,which is conducive to the recovery of lighter fractions,while heavier fractions (C₁₀-C₃₆₊) remain in place.Implementing CO₂ gravity miscible displacement after water injection at the bottom of the reservoir can further enhance the recovery of crude oil.Both the degree of oil-gas mass transfer and the gas injection rate affect the oil displacement efficiency.The stronger the degree of oil-gas mass transfer and the lower the injection rate,the more effectively CO₂ can extract,strip,and dissolve,thereby fully producing the contiguous remaining oil and the remaining oil that has not been in direct contact with CO₂.Based on NMR experiment results,the reservoir space can be divided into pore space and fracture space.Compared with CO₂ non-miscible flooding,CO₂ gravity miscible flooding after water flooding can improve the recovery from both matrix and fractures.After miscible flooding of twice the pore volume,the recovery from the matrix is 49.3%,and that from the fractures is 99.3%.Field practice has demonstrated that top-injected CO₂ gravity miscible displacement is an effective means of succession development for enhancing oil recovery in the Balixi buried hill reservoir.

Key words： CO₂ gravity miscible displacement; CCUS; buried hill reservoir; mechanism; oil displacement characteristics; online NMR

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