致密储层不同裂缝条件下CO2吞吐原油动用特征
DOI:
作者:
作者单位:

中国石油大学北京石油工程学院

作者简介:

通讯作者:

中图分类号:

TE312

基金项目:

国家自然科学基金“页岩油注CO2过程中重有机质沉积机理表征及预测”(项目编号52174039),中国石油战略合作科技专项“鄂尔多斯盆地致密油-页岩油油藏工程方法及关键技术研究”(项目编号ZLZX2020-02-04)


Analysis of oil and water movement patterns in fishbone wells with different branching angles
Author:
Affiliation:

College of Petroleum Engineering,China University of PetroleumBeijing,Beijing City

Fund Project:

  • 摘要
  • |
  • 图/表
  • |
  • 访问统计
  • |
  • 参考文献
  • |
  • 相似文献
  • |
  • 引证文献
  • |
  • 资源附件
  • |
  • 文章评论
    摘要:

    致密储层通常采取大规模体积压裂开发,以有效沟通天然裂缝,这些裂缝对CO2吞吐驱油具有显著影响。为明确致密储层不同裂缝条件下CO2吞吐的原油动用特征,分别开展了不同裂缝开度下的CO2吞吐核磁共振实验和多尺度裂缝条件下的CO2吞吐微观可视化实验,系统研究了裂缝开度及裂缝密度对CO2吞吐效果的影响,实验结果表明:在单一裂缝条件下,裂缝开度的增加显著提高了裂缝及周围基质的原油动用程度,当裂缝开度从20μm增加到70μm时,采出程度提高9.20%;在多裂缝条件下,裂缝密度的增加增强了储层连通性,扩大了CO2的波及范围,相比简单缝模型,复杂缝模型的基质动用程度提高了4.26%。多尺度裂缝对采出程度的增幅主要体现在前两个吞吐轮次,后续轮次增油效果逐渐减弱。提高裂缝开度和裂缝密度均能有效提高致密油藏中基质原油动用程度。研究成果可为致密油藏CO2吞吐提高采收率提供一定指导意义。

    Abstract:

    Tight reservoirs are typically developed through large-scale hydraulic fracturing to effectively connect natural fractures, which significantly influence CO? huff-n-puff oil recovery. To clarify the characteristics of oil mobilization under different fracture conditions in tight reservoirs, CO? huff-n-puff nuclear magnetic resonance (NMR) experiments were conducted for varying fracture apertures, along with micro-visualization experiments under multi-scale fracture conditions. The effects of fracture aperture and fracture density on CO? huff-n-puff performance were systematically investigated. The results show that in the case of a single fracture, increasing the fracture aperture enhances the mobilization of crude oil in both the fracture and surrounding matrix. When the fracture aperture increased from 20μm to 70μm, recovery improved by 9.20%. Under multi-scale fracture conditions, increasing fracture density enhances reservoir connectivity and expand the swept volume of CO2. Compared to simple fracture model, complex fracture model improved matrix oil mobilization by 4.26%. The enhancement in recovery factor primarily occurs during the first two huff-n-puff cycles, with the incremental oil recovery effect diminishing in subsequent cycles. Increasing fracture aperture and fracture density effectively improve matrix oil mobilization in tight oil reservoirs. The research can provide valuable guidance for improving CO2 huff-n-puff recovery rates in tight oil reservoirs.

    参考文献
    相似文献
    引证文献
引用本文
文章指标
  • 点击次数:
  • 下载次数:
  • HTML阅读次数:
  • 引用次数:
历史
  • 收稿日期: 2024-11-12
  • 最后修改日期: 2024-12-18
  • 录用日期: 2025-01-15
  • 在线发布日期:
  • 出版日期:
点击这里给我发消息

点击这里给我发消息