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首頁» 過刊瀏覽» 2016» Vol. 1» Issue (2) 233-240???? DOI : 10.3969/j.issn.2096-1693.2016.02.019
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低滲透非均質油藏WAG注入?yún)?shù)優(yōu)化實驗及提高采收率機理研究
郝宏達,趙鳳蘭,侯吉瑞,,宋兆杰,侯利斌,,王志興,李文峰,付忠鳳
1 中國石油大學(北京)提高采收率研究院, 北京 102249 2 中石油三次采油重點實驗室低滲油田提高采收率應用基礎理論研究室, 北京 102249 3 北京市重點實驗室溫室氣體封存與石油開采利用, 北京 102249
Parameter optimization for enhanced oil recovery: Mechanisms of WAG flooding in heterogeneous low permeability layers
HAO Hongda, ZHAO Fenglan, HOU Jirui, SONG Zhaojie, HOU Libin, WANG Zhixing, LI Wenfeng, FU Zhongfeng
1 Research Institute of Enhanced Oil Recovery, China University of Petroleum-Beijing, Beijing 102249, China 2 Basic Theory Laboratory of Improved Oil Recovery in Low Permeability Oil Fields, Tertiary Oil Recovery Key Laboratory, CNPC, Beijing 102249, China 3 Key Laboratory of Greenhouse Gas Sequestration and Oil Exploitation, Beijing 102249, China

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摘要? 低滲透非均質油藏通常具有氣驅效率低,、氣竄嚴重等特點,,氣水交替注入(WAG)能夠在一定程度上改善氣驅的驅油效果。本文借助室內實驗明確了WAG驅在低滲透非均質油藏的適應性,,并從流度控制能力的角度分析了WAG驅提高采收率的作用機理,。相對于均質油藏,WAG驅在滲透率級差較小的低滲透非均質油藏中具有更好的適應性,。對于非均質程度較弱的低滲/特低滲透油藏,,WAG驅可充分發(fā)揮其流度控制作用,啟動低滲層中的原油,,擴大注入氣的波及體積,,改善注入氣的驅油效果。WAG驅注入?yún)?shù)優(yōu)化結果表明,,在注氣速度為0.3 mL/min,、段塞尺寸為0.1 PV和氣水比為1:1的注入?yún)?shù)條件下,WAG驅可在水驅的基礎上使低滲透非均質模型的采收率提高20.96個百分點,。
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關鍵詞 : 低滲透油藏,; 非均質性,; WAG; 流度控制,; 提高采收率
Abstract

  Low gas displacement efficiency and gas channeling phenomena usually occur in heterogeneous slow permeability layers. Water alternating gas (WAG) and CO2 flooding can effectively improve the gas flooding efficiency. The adaptability of WAG flooding for low permeability layers with heterogeneity was confirmed through laboratory experiments. The mechanism of enhancing oil recovery was then revealed through analyzing the mobility control ability of WAG flooding. Better adaptability of WAG flooding was found in weakly heterogeneous reservoirs compared with homogeneous reservoirs. When applied in low permeability reservoirs with weak heterogeneity, WAG flooding can present excellent mobility control ability, which compels the injected fluid to displace the crude oil in the relatively low permeability layers, enlarges the swept volume of injected gas, and then improves the CO2 flooding efficiency. The parameter optimization results of WAG flooding showed in laboratory tests that: with a gas injection rate of 0.3 mL/min, a slug size of 0.1 PV and an injected gas/water ratio of 1:1, 21% of OOIP can be recovered by WAG flooding after water flooding in low permeability layers with heterogeneity.

Key words: low permeability reservoirs ; heterogeneity ; WAG ; mobility control ; EOR
收稿日期: 2018-05-30 ????
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郝宏達,,趙鳳蘭,侯吉瑞,,宋兆杰,,侯利斌,王志興,,李文峰,付忠鳳. 低滲透非均質油藏WAG注入?yún)?shù)優(yōu)化實驗及提高采收率機理研究[J]. 石油科學通報, 2016, 1(2): 233-240. HAO Hongda, ZHAO Fenglan, HOU Jirui, SONG Zhaojie, HOU Libin, WANG Zhixing, LI Wenfeng, FU Zhongfeng. Parameter optimization for enhanced oil recovery: Mechanisms of WAG flooding in heterogeneous low permeability layers. 石油科學通報, 2016, 1(2): 233-240.
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