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摘要? 海上S油田水驅(qū)開發(fā)已進(jìn)入高含水階段，但仍存在大量剩余油,，進(jìn)一步提高采收率的潛力和方向未知。通過高倍數(shù)水驅(qū)實(shí)驗(yàn)對S油田在典型滲透率和原油黏度下的極限驅(qū)油效率進(jìn)行評價,，明確S油田水驅(qū)高含水期提高采收率潛力,；并利用在線核磁共振測試，揭示S油田高含水期剩余油分布規(guī)律,；其次,，通過高倍數(shù)水驅(qū)和核磁共振驅(qū)油實(shí)驗(yàn)，探究S油田水驅(qū)后二元驅(qū)極限驅(qū)油效率和動用剩余油規(guī)律,，明確水驅(qū)后二元驅(qū)提高采收率潛力,。研究表明，S油田水驅(qū)后提高采收率潛力較大,；高倍數(shù)水驅(qū)極限驅(qū)油效率最高達(dá)75.2%,，相比高含水期，提高17.6~25.8 個百分點(diǎn),；高含水期剩余油主要分布在半徑大于10 μm 和1~10 μm 的孔隙中,，分別占32.4%~55.1%和35.1%~47.7%。注入二元體系后,，降水增油效果顯著,，極限驅(qū)油效率提高至84.8%，相比高含水期,，提高33個百分點(diǎn),，且后續(xù)水驅(qū)僅需不到2 PV。二元體系通過提高波及體積和洗油效率,，能夠有效動用不同大小孔隙中的剩余油,。海上S油田水驅(qū)后二元驅(qū)能夠有效提高采收率,，且顯著降低開發(fā)時間成本。

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關(guān)鍵詞 ：高倍數(shù)水驅(qū),核磁共振,剩余油分布,提高采收率潛力,二元驅(qū)

Abstract：

The offshore S oilfield has entered a high water cut development stage, yet a significant amount of residual oil remains, indicating potential for further enhanced oil recovery. This study evaluates the ultimate oil displacement efficiency of the S oilfield under typical permeability and crude oil viscosity conditions through high multiple waterflooding experiments, thus clarifying the EOR potential during this period. Using online nuclear magnetic resonance testing, the distribution pattern of residual oil during the high water cut stage is revealed. Additionally, by conducting high multiple waterflooding and online nuclear magnetic resonance displacement experiments, the study investigates the ultimate oil displacement efficiency and the mobilization pattern of residual oil in the offshore S oilfield after waterflooding, thereby determining the EOR potential with binary flooding post-waterflooding. The research indicates significant potential for enhancing oil recovery after water flooding in the offshore S oilfield. The ultimate oil displacement efficiency with high multiple water flooding reaches up to 75.2%, which is 17.6 to 25.8 percentage points higher compared to the high water cut stage. During the high water cut stage, residual oil is mainly distributed in pores with radius >10 μm and 1~10 μm, accounting for 32.4%~55.1% and 35.1%~47.7%, respectively. After injecting the binary system, the water cut decreases, and oil production increases significantly, with the ultimate oil displacement efficiency rising to 84.8%, an increase of 33 percentage points, requiring less than 2 PV of subsequent water flooding. The binary system effectively mobilizes residual oil in pores of different sizes by increasing sweep volume and oil displacement efficiency. Therefore, binary flooding after water flooding in the offshore S oilfield can effectively enhance oil recovery and significantly reduce development time costs.

Key words： high multiple waterflooding; nuclear magnetic resonance; residual oil distribution; enhanced oil recovery potential; binary flooding

收稿日期: 2025-02-26 ????

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袁偉峰, 侯吉瑞, 劉洋, 肖立曉, 聞宇晨, 曹程程. 海上油田水驅(qū)后剩余油分布規(guī)律及二元驅(qū)動用潛力. 石油科學(xué)通報, 2025, 10(01): 133-143 YUAN Weifeng, HOU Jirui, LIU Yang, XIAO Lixiao, WEN Yuchen, CAO Chengcheng. Residual oil distribution pattern and binary flooding utilization potential of offshore oilfields after waterflooding. Petroleum Science Bulletin, 2025, 10(01): 133-143.

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