Journal of Liaoning Petrochemical University ›› 2025, Vol. 45 ›› Issue (1): 65-73.DOI: 10.12422/j.issn.1672-6952.2025.01.009

• Oil and Gas Engineering • Previous Articles     Next Articles

Adaptability Analysis of Synergistic Enhanced Oil Recovery Techniques Through Chemical Flooding and Infill Well Patterns in Offshore Oilfields

Engao TANG1,2(), Lezhong LI1,2, Wensheng ZHOU1,2, Gongchang WANG3, Zenghua ZHANG1,2(), Yi JIN1,2, Erlong YANG4   

  1. 1.National Key Laboratory of Offshore Oil and Gas Efficient Development,Beijing 100028,China
    2.CNOOC Research Institute,Beijing 100028,China
    3.CNOOC Tianjin Branch,Tianjin 300450,China
    4.School of Petroleum Engineering,Northeast Petroleum University,Daqing Heilongjiang 163319,China
  • Received:2024-10-13 Revised:2024-11-06 Published:2025-02-25 Online:2025-02-15
  • Contact: Zenghua ZHANG

海上油田化学驱与加密协同增效技术适应性分析

唐恩高1,2(), 李乐忠1,2, 周文胜1,2, 王公昌3, 张增华1,2(), 金一1,2, 杨二龙4   

  1. 1.海洋油气高效开发全国重点实验室,北京 100028
    2.中海油研究总院有限责任公司,北京 100028
    3.中海油天津分公司,天津 300450
    4.东北石油大学 石油工程学院,黑龙江 大庆 163319
  • 通讯作者: 张增华
  • 作者简介:唐恩高(1978⁃),男,博士,高级工程师,从事海上油田提高采收率原理与技术方面的研究;E⁃mail:tangeg@cnooc.com.cn
  • 基金资助:
    中海油“十四五”重大科技专项项目(KJGG2021?0500)

Abstract:

Offshore oilfield development faces complex geological conditions and high development costs, with limited platform lifespans and well locations. These constraints reduce the effectiveness of chemical flooding for enhancing oil recovery. Based on the geological characteristics of offshore oilfields, and drawing on the results of synergistic enhanced oil recovery (EOR) techniques combining chemical flooding and infill well patterns in Daqing, Dagang, and Shengli oilfields, this study evaluates the synergistic potential of chemical flooding agents, well pattern infill, and layer adjustment. The synergy between chemical flooding and infill well pattern optimization for enhanced oil recovery was established. Relying on numerical simulation, an optimized design for synergistic chemical flooding and infill well patterns was developed for the SZ36?1 oilfield. The effects of reservoir permeability, permeability heterogeneity, and crude oil viscosity on enhanced oil recovery potential were clarified, along with the establishment of corresponding boundaries. The study demonstrated that after the original inverted nine?spot well pattern is encrypted into an oblique inverted nine?spot well pattern, the well spacing is reduced by half. Combined with polymer flooding technology, the recovery rate can be increased by 9.8%, which is 3.4% higher than the sum of the recovery increases achieved by independent water flooding and polymer flooding. This result confirms that by utilizing the synergistic effect of chemical flooding and infill well pattern technology in offshore oilfields, the sweep efficiency of the oil displacement system can be significantly enhanced, leading to a substantial increase in recovery rates and optimization of production capacity.

Key words: Chemical flooding, Well pattern encryption, Two?three combination, Synergistic effect

摘要:

海上油田由于复杂的地质条件和高昂的开发成本,以及平台寿命有限且井位稀缺,导致化学驱提高采收率的能力受到限制。基于海上油田的不同地质特征,结合大庆、大港及胜利油田化学驱和井网加密协同增效技术方面应用的效果,论证了化学驱油剂、井网加密及层系调整间的协同能力,并明确了化学驱与加密协同增效技术的实施途径。通过数值模拟方法,优化了SZ36?1油田的化学驱与加密协同增效方案,明确了储层渗透率、渗透率级差、原油黏度对增效能力的影响,并给出了相关界限。结果表明,将原反九点井网加密为斜反九点法井网后,井距缩小1/2,结合聚合物驱油技术,采收率提高幅度可达9.8%,相比单独进行加密水驱和单独进行化学驱的采收率之和增加了3.4%。该结果证实海上油田通过化学驱与井网加密技术相结合,可进一步提升驱油体系的波及体积,大幅度提高采收率,实现产能最优化。

关键词: 化学驱, 井网加密, 二三结合, 协同增效

CLC Number: 

Cite this article

Engao TANG, Lezhong LI, Wensheng ZHOU, Gongchang WANG, Zenghua ZHANG, Yi JIN, Erlong YANG. Adaptability Analysis of Synergistic Enhanced Oil Recovery Techniques Through Chemical Flooding and Infill Well Patterns in Offshore Oilfields[J]. Journal of Liaoning Petrochemical University, 2025, 45(1): 65-73.

唐恩高, 李乐忠, 周文胜, 王公昌, 张增华, 金一, 杨二龙. 海上油田化学驱与加密协同增效技术适应性分析[J]. 辽宁石油化工大学学报, 2025, 45(1): 65-73.