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分散型调驱体系传输运移及封堵效果——以渤海BZ29￣4S油田为例
断块油气田
2020年 27卷 第6期
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Title
Migration and blocking effect of dispersed flooding agent: taking Bohai BZ29-4S oilfield
as an example
单位
东北石油大学提高油气采收率教育部重点实验室，黑龙江 大庆 163318
中海石油（中国）有限公司天津分公司，天津 300450
Organization
MOE Key Laboratory of Enhanced Oil Recovery, Northeast Petroleum University, Daqing 163318, China
Tianjin Branch of CNOOC Ltd., Tianjin 300450, China
摘要
分散型调驱体系具有非连续相、注入能力强、堵大不堵小、缓膨效应等优势。为了进一步提高分散调驱体系矿场应用效果，文中以渤海BZ29￣4S油田储层地质和流体为模拟对象，在18 m长岩心上开展了分散型调驱体系传输运移、封堵效果及采出液中颗粒结构形态研究。结果表明：分散型调驱体系在岩心内流动呈现非活塞式推进，即存在窜流现象；在岩心内可以持续发生传输运移和水化膨胀作用，致使体系的封堵作用持续增强，30 d后平均封堵率仍高达43.34%。在注入过程中，颗粒会在注入端面发生严重滞留，引起注入压力“虚高”，甚至造成注入困难，建议矿场施工时采取分散型调驱体系与水交替注入的方式，减小端面堵塞，提高液流转向效果。
Abstract
12The dispersed flooding agent has the advantages of discontinuous phase characteristics, strong injection ability, blocking large holes not small holes, and slow expansion effect. In order to further improve the application effect of the dispersed flooding agent, this article takes the reservoir geology and fluids of the BZ29-4S oilfield in Bohai as simulation objects, and develops the transport, blocking effect, and particle structure and morphology of the dispersed flooding agent on the 18-meter long core. The results show that the dispersed flooding agent is injected into the core by non-piston propulsion, there is channeling phenomenon; this agent can be transported and hydrated for a long time in the core. The dispersed flooding agent can undergo hydration and swelling in the core, resulting in continuous plugging. The average blocking rate of the core after 30 days can reach 43.34%. During the injection process, the particles will be severely trapped on the surface of the injection side, causing the injection pressure to be “virtually high” and even causing injection difficulties. It is recommended to adopt a dispersed flooding agent and water injection in the construction of the mine to reduce blockage near the wellhead and improve the effect of fluid steering.
关键词：
分散型调驱体系;
传输运移;
水化膨胀;
封堵效果;
物理模拟;
Keywords:
dispersed flooding agent;
transport and migration;
hydration expansion;
blocking effect;
physical simulation;
DOI
10.6056/dkyqt202006022
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