大港油田沧东凹陷孔二段页岩油合理闷井时间优化研究
Research on the optimization of rational shut-in time for shale oil in the Kong-2
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- 引用格式:
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陈锐,周华兴,唐庆,王淼迪,刘成源,王栋,马赫.大港油田沧东凹陷孔二段页岩油合理闷井时间优化研究[J].天然气与石油,2025,43(4):86-91.doi:10.3969/j.issn.1006-5539.2025.04.012
CHEN Rui, ZHOU Huaxing, TANG Qing, WANG Miaodi, LIU Chengyuan, WANG Dong, MA He.Research on the optimization of rational shut-in time for shale oil in the Kong-2[J].Natural Gas and Oil,2025,43(4):86-91.doi:10.3969/j.issn.1006-5539.2025.04.012
- DOI:
- 10.3969/j.issn.1006-5539.2025.04.012
- 作者:
- 陈锐1 周华兴1 唐庆1 王淼迪1 刘成源1 王栋1 马赫2
CHEN Rui1, ZHOU Huaxing1, TANG Qing1, WANG Miaodi1, LIU Chengyuan1, WANG Dong1, MA He2
- 作者单位:
- 1. 中国石油大港油田分公司, 天津 300280; 2. 中国石油大学(北京)石油工程学院, 北京 101137
1. China National Petroleum Corporation Dagang Oilfield Branch, Tianjin, 300280, China; 2. College of Petroleum Engineering, China University of Petroleum (Beijing), Beijing, 101137, China
- 关键词:
- 沧东页岩油;孔二段;闷井时间;基质渗吸平衡;渗吸前缘
Cangdong shale oil; Kong-2 member; Shut-in time; Matrix imbibition equilibrium; Imbibition front edge
- 摘要:
- 页岩油储层压后合理闷井时间对提高单井全生命周期累产油具有重要作用,但受储层物性、水平段长度及压裂工艺等因素的影响,不同层系闷井后自喷生产阶段见油规律差异性较大。以大港油田沧东凹陷孔二段页岩油5号平台C1、C3层系为例,通过室内岩心渗吸实验分析压裂液—页岩油渗吸置换规律,同时综合分析闷井后油井自喷阶段含水变化、井口压力变化以及数值模拟压后储层基质渗吸平衡变化规律,确定沧东凹陷孔二段页岩油合理闷井时间为37~42 d,为页岩油精细排采生产管理提供了理论指导,也为其他油田优化页岩油合理闷井时间提供了方法借鉴。
The optimal well shut-in time after fracturing plays an important role in improving the single-well Estimated Ultimate Recovery(EUR) of shale oil, but it is affected by reservoir properties, horizontal section length and fracturing process parameters, etc, and the oil production pattern during the natural flow phase after well shut-in period vary significantly across different formations. Taking the C1 and C3 layers of the Kong-2 member of Cangdong Depression of Dagang Oilfield, Platform No.5 as a case study, this study analyzed the imbibition and displacement pattern of fracturing fluid-shale oil by indoor core imbibition experiments, and by comprehensively analyzing the changes in water cut during the natural flow phase after well shut-in, wellhead pressure change of oil wells after flowback, as well as the evolution of post-fracturing reservoir matrix imbibition equilibrium revealed by numerical simulation, the rational shut-in time for the shale oil in Kong-2 member was optimized and determined to be 37 to 42 days. This provides theoretical guidance for the fine production and draiange management of Dagang shale oil and offers a methodological reference for the rational optimization of the shut-in time for shale oil wells in other oilfields.
