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致密油藏层内爆燃压裂缝网渗流及产能特征

杨兆中1,黄馨1,覃兆勇2,雷腾蛟3,易良平1   

  1. 1.油气藏地质及开发工程国家重点实验室/西南石油大学,四川 成都 610500;
    2.新疆油田公司工程技术研究院,新疆 克拉玛依 834000;
    3.中国石油塔里木油田分公司开发事业部,新疆 库尔勒 841000
  • 收稿日期:2015-10-09 修回日期:2015-12-10 出版日期:2016-06-10 发布日期:2016-06-10
  • 通讯作者: 黄馨(1994-),女,四川成都人,硕士研究生,主要从事低渗透油气藏增产改造研究. E-mail:13547805535@163.com.
  • 作者简介:杨兆中(1969-),男,四川泸州人,教授,博士生导师,主要从事低渗透油气藏增产改造理论、技术与油气藏数值模拟研究. E-mail:yzzycl@vip.sina.com.
  • 基金资助:
    四川省科技支撑计划“页岩气层内爆炸压裂专用炸药研制及其综合性能评价研究”(编号:2015SZ0005)资助.

The flow and deliverability in tight oil reservoir after explosive fracturing

Yang Zhao-zhong1,Huang Xin1,Qin Zhao-yong2,Lei Teng-jiao3,Yi Liang-ping1   

  1. 1.State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation,Southwest Petroleum University,Chengdu 610500,China;
    2.Engineering Technology Research Institute of Xinjiang Oilfield Company,Karamay 834000,China;
    3.PetrolChina Tarim Oilfield Company Development Department,Korla 841000,China
  • Received:2015-10-09 Revised:2015-12-10 Online:2016-06-10 Published:2016-06-10

摘要: 利用类分形树状网络理论表征复杂的爆燃次生裂缝,考虑启动压力梯度和压敏效应影响,耦合基质非线性渗流区、爆燃次生裂缝波及范围的椭圆线性渗流区、主裂缝线性渗流区,建立了致密油藏水力裂缝层内爆燃压裂非线性渗流稳态模型。实例计算表明:对于致密油藏,爆燃压裂较常规水力压裂在提高增产效果方面具有明显优势,增产效果约为常规水力压裂的1.5倍。爆燃改造区域渗透率Kin与裂缝分形维数Df成正比、与迂曲度分形维数Dt和裂缝分叉角度θ成反比。层内爆燃压裂增产效果主要受爆生裂缝距离影响,与裂缝分形维数Df、迂曲度分形维数Dt相关性不强,因此选用能量释放率低或具多级反应速率的爆燃药剂,减小裂缝分叉角θ,增加爆生裂缝长度,扩大储层改造体积,是提高产能、优化储层改造效果的重点。

关键词: 致密油藏, 爆燃压裂, 树状分形, 流固耦合, 产能预测

Abstract: In consideration of the matrix,fracture network and main fracture coupling flow under the threshold pressure gradient and the pressure sensitive effect,on the basis of the fractal tree-like theory,a non-linear steady productivity prediction model was established for hydraulic fracture well after exploration.The computational results show that,compared with the conventional hydraulic fracturing,such a well in tight oil reservoir,getting 1.5 times productivity,possesses evident superiority.The permeability in explosive zone is in proportion with pore fractal dimension Df,while inversely with tortuosity dimension Dt and bifurcation angel θ.The pore fractal dimension Df and the tortuosity dimension Dt have little influence on stimulation ratio.Due to the main effect of the explosive fracture length on stimulation ratio,dynamites,with low energy release rate or multistage reaction rate,should be chosen to minish bifurcation angel and magnify facture volume.

Key words: Tight oil reservoir, Explosive fracture, Fractal tree-like branching networks, Fluid-structure interaction, Productivity prediction

中图分类号: 

  • TE348

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