石油学报 ›› 2008, Vol. 29 ›› Issue (1): 116-119.DOI: 10.7623/syxb200801025

• 石油工程 • 上一篇    下一篇

新井定向射孔转向压裂裂缝起裂与延伸机理研究

张广清1,3, 陈勉1, 赵艳波2   

  1. 1. 中国石油大学石油天然气工程学院, 北京, 102249;
    2. 大庆油田有限责任公司第九采油厂, 黑龙江大庆, 163853;
    3. 中国石油大学石油天然气工程学院, 北京, 102249
  • 收稿日期:2007-01-24 修回日期:2007-04-26 出版日期:2008-01-25 发布日期:2010-05-21
  • 作者简介:张广清,男,1975年7月生,2002年获中国石油大学(北京)博士学位,现为中国石油大学(北京)石油天然气工程学院副教授,主要从事石油工程岩石力学与岩土工程的研究.E-mail:zhangguangqing@vip.163.com
  • 基金资助:
    国家自然科学基金项目(No.90510005)“深层应力敏感性复杂地层的钻井液漏失规律研究”;国家自然科学基金项目(No.50274054)“水平井水力裂缝非平面扩展的物理模拟研究”联合资助

Study on initiation and propagation mechanism of fractures in oriented perforation of new wells

ZHANG Guangqing1,3, CHEN Mian1, ZHAO Yanbo2   

  1. 1. Faculty of Petroleum Engineering, China University of Petroleum, Beijing 102249, China;
    2. No. 9 Oil Production Plant, PetroChina Daqing Oilfield Limited Company, Daqing 163853, China;
    3. Urban Oil/Gas Distribution Technique Key Lab of Beijing, China University of Petroleum, Beijing 102249, China
  • Received:2007-01-24 Revised:2007-04-26 Online:2008-01-25 Published:2010-05-21

摘要: 为了提高特低渗油藏新井的压裂效果,提出了采用定向射孔技术进行转向压裂从而形成双S型水力裂缝的新方法。基于有限元三维应力分析,研究了定向射孔下水力裂缝的起裂机理。考虑任意裂缝形态、地应力和缝内液体压力分布的影响,建立了任意形状裂缝应力强度因子的确定模型;同时考虑Ⅰ型和Ⅱ型断裂,建立了复合裂缝延伸准则。提出了定向射孔水力压裂裂缝的延伸轨迹计算模型和步骤,编制了裂缝延伸的模拟软件。采用地面微震进行了3口井的现场验证,地面微震检测结果与计算结果吻合。利用定向射孔压裂技术在单个层内可以形成双S型水力裂缝,可作为提高特低渗透油田产量的一种方式。

关键词: 特低渗透油藏, 水力压裂, 定向射孔, 转向压裂, 双S型裂缝, 计算模型

Abstract: In order to improve fractures in new wells of low-permeability reservoirs,a new methodology to generate dual-S fractures in deflection fracturing of oriented perforation was proposed.The three-dimensional finite element method was used to study the mechanism of fracture initiation in oriented perforation.Considering the shape of arbitrary fracture,underground stress and fluid pressure distributed in fractures,a model for specifying stress intensity factor of arbitrary fracture was set up.The propagation criteria for mixed-type fracture of type Ⅰ and type Ⅱ were also presented.The models and computation procedures for determining fracture propagation path were provided,and the software for simulation of fracture propagation was developed.Surface micro-seismic technique was used in fracturing treatment of three wells to monitor fracture propagation directions.The monitoring results agreed well with the model prediction.The dual-S type fractures can be generated in a single formation by using oriented perforation fracturing technology,which may be an effective method to improve oil production in ultra-low permeability reservoir.

Key words: ultra-low permeability reservoir, hydraulic fracturing, oriented perforation, deflection fracturing, dual-S fracture, computation model

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