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| 致密油藏水平井缝间周期异步注氮气驱油效率试验 |
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谭凌方1,2,3,熊伟2,3,沈瑞2,3,杨懿1,2,3,张建中1,2,3,邵国勇1,2,3,艾婷婷4
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(1.中国科学院大学工程科学学院,北京 100049;2.中国科学院渗流流体力学研究所,河北廊坊 065007;3.中国石油勘探开发研究院,北京 100083;4.中国石油化工股份有限公司西北分公司,新疆乌鲁木齐 830011)
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| 摘要: |
| 非常规油藏储量规模大,但其致密储层在水平井分段压裂后,难以依靠井网注采补充能量,导致单井递减快、采收率低。为实现非常规油藏效益开发,探索有效的能量补充方式,开展水平井缝间周期异步注气,即从偶数缝注气,把油驱向奇数缝的 能量补充研究。选取长岩心模拟两条缝,开展注氮气驱油物理模拟试验,并与缝间周期异步注水进行对比。结果表明:缝间周期异步注气能在短时间内实现压力大幅度提升,有效补充能量；15个周期的缝间异步注气总驱油效率为51.97%,与相同周期的缝间异步注水相比,驱油效率提高18.17%；单周期注气量逐渐增大,累积产油增多,但换油率逐渐减小,实际工作中应合理确定注气周期和注入量。 |
| 关键词: 致密油藏 缝间异步注气 提高采收率 有效补充能量 |
| DOI：10.3969/j.issn.1673-5005.2025.01.013 |
| 分类号::TE 34 |
| 文献标识码:A |
| 基金项目:中国石油天然气股份有限公司"十四五"前瞻性基础性重大科技项目(2021DJ1103) |
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| Experiment on oil displacement efficiency of horizontal well in tight reservoirs with periodic asynchronous nitrogen injection |
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TAN Lingfang1,2,3, XIONG Wei2,3, SHEN Rui2,3, YANG Yi1,2,3, ZHANG Jianzhong1,2,3, SHAO Guoyong1,2,3, AI Tingting4
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(1.College of Engineering Science, University of Chinese Academy of Sciences, Beijing 100049, China;2.Institute of Porous Flow and Fluid Mechanics, Chinese Academy of Sciences, Langfang 065007, China;3.Research Institute of Petroleum Exploration & Development, PetroChina, Beijing 100083, China;4.Northwest Branch Company, China Petroleum & Chemical Corporation, Urumqi 830011, China)
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| Abstract: |
| Unconventional tight oil reservoirs have large reserves, but it is difficult to rely on conventional well pattern of injection and production to replenish energy after horizontal well fracturing, resulting in rapid production decline and low recovery efficiency, and it is necessary to explore effective ways of energy supplement. In this study, a periodic asynchronous gas injection between horizontal wells, i.e. gas injection from even fractures to drive oil to odd fractures, was proposed and investigated. In the experiments, rock cores with two long fractures were used to carry out the simulation experiments of nitrogen injection for oil displacement, and comparing with water injection. The results show that periodic asynchronous gas injection can greatly increase the pressure in a short time and effectively replenish reservoir energy. The total oil displacement efficiency of 15 periods of gas injection between fractures can reach to 51.97%. Compared with the same period of asynchronous water injection between fractures, the oil displacement efficiency is increased by 18.17%. With a gradually increase of the amount of single cycle gas injection, the cumulative oil production can be increased, but the oil and nitrogen ratio gradually decreases. Therefore, the gas injection cycle and injection volume should be reasonably determined in field operation. |
| Key words: tight reservoir inter-fracture asynchronous gas flooding (IFAGF) enhanced oil recovery effectively replenish energy |
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