特种油气藏 ›› 2023, Vol. 30 ›› Issue (5): 127-134.DOI: 10.3969/j.issn.1006-6535.2023.05.017

• 油藏工程 • 上一篇    下一篇

页岩油水平井体积压裂缝网波及体积评价新方法及应用

张矿生, 薛小佳, 陶亮, 熊作为, 陈文斌, 武安安, 闫广   

  1. 中国石油长庆油田分公司,陕西 西安 710018
  • 收稿日期:2022-08-19 修回日期:2023-06-02 出版日期:2023-10-25 发布日期:2023-12-25
  • 通讯作者: 陶亮(1986—),男,工程师,2010年毕业于东北石油大学石油工程专业,2019年毕业于西南石油大学油气田开发工程专业,获博士学位,现主要从事非常规油气储层改造方面的研究工作。
  • 作者简介:张矿生(1976—),男,高级工程师,1998年毕业于西南石油学院石油工程专业,2004年毕业于该校油气田开发工程专业,获硕士学位,现主要从事非常规油气储层改造方面的研究与管理工作。
  • 基金资助:
    国家科技重大专项“鄂尔多斯盆地致密油开发示范工程”(2017ZX05069);中国石油科学研究与技术开发项目“鄂尔多斯盆地页岩油勘探开发理论与关键技术研究”(2021DJ1806)

New Method for Evaluating the Volume Fracturing Fracture Network Sweep Volume in Shale Oil Horizontal Wells and Its Application

Zhang Kuangsheng, Xue Xiaojia, Tao Liang, Xiong Zuowei, Chen Wenbin, Wu An'an, Yan Guang   

  1. PetroChina Changqing Oilfield Company, Xi'an, Shaanxi 710018, China
  • Received:2022-08-19 Revised:2023-06-02 Online:2023-10-25 Published:2023-12-25

摘要: 针对鄂尔多斯盆地庆城油田夹层型页岩油体积压裂缝网波及体积定量表征难度大的问题,应用物理模拟实验与矿场数据,耦合关键地质工程参数,建立缝网改造体积预测模型,基于岩石微观结构与润湿性,建立了考虑流体压力下的多尺度孔隙渗吸模型,对缝网渗吸体积进行定量表征,并提出新的缝网波及系数概念,定量评价缝网波及体积。研究表明:页岩油体积压裂裂缝总体呈现条带状缝网形态,形似“仙人掌”;影响缝网波及体积的主控因素依次为压裂液量、裂缝密度、脆性指数、施工排量、水平应力差、油层厚度、加砂量;缝网改造体积是水平井体积压裂缝网波及体积的主要贡献者,压裂液在缝网中的渗吸主要用于补充地层能量,典型平台缝网波及系数为33.2%~63.6%,需进一步提高缝网波及体积。研究成果可为页岩油水平井体积压裂效果评价提供参考。

关键词: 页岩油, 缝网波及体积, 渗吸模型, 缝网波及系数, 庆城油田

Abstract: In response to the difficulty of quantitative characterization of the fracture network sweep volume of sandwich-type shale oil volume fracturing in Qingcheng Oilfield, Ordos Basin, a fracture network stimulation volume prediction model is established by applying physical model experiments and mine field data and coupling key geological engineering parameters, and a multi-scale pore percolation model considering fluid pressure is established to quantitatively characterize the fracture network percolation volume based on rock microstructure and wettability, and a new concept of fracture network sweep efficiency is proposed to quantitatively evaluate the fracture network sweep volume. The study shows that the shale oil volume fractures generally show a strip-like fracture network with the main fractures dominating and branch fractures supplementing, and the shape is similar to a "cactus"; the main controlling factors affecting the sweep volume of the fracture network are fracturing fluid volume, fracture density, brittleness index, pumping rate, horizontal stress difference, reservoir thickness, and sand addition; the stimulation volume of fracture network is the main contributor to the fracture network sweep volume of the horizontal well volume fracturing. The percolation volume of fracturing fluid in the fracture network is mainly used to replenish the energy of the formation, the fracture network sweep efficiency of the typical platform is 33.2% to 63.6%, and the fracture network sweep volume needs to be further improved. The research results can provide a reference for the evaluation of the volume fracturing effect of shale oil horizontal wells.

Key words: shale oil, fracture network sweep volume, percolation model, fracture network sweep efficiency, Qingcheng Oilfield

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