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不同煤体结构煤的水力压裂裂缝延伸规律

贾奇锋 倪小明 赵永超 曹运兴

贾奇锋, 倪小明, 赵永超, 曹运兴. 不同煤体结构煤的水力压裂裂缝延伸规律[J]. 煤田地质与勘探, 2019, 47(2): 51-57. doi: 10.3969/j.issn.1001-1986.2019.02.009
引用本文: 贾奇锋, 倪小明, 赵永超, 曹运兴. 不同煤体结构煤的水力压裂裂缝延伸规律[J]. 煤田地质与勘探, 2019, 47(2): 51-57. doi: 10.3969/j.issn.1001-1986.2019.02.009
JIA Qifeng, NI Xiaoming, ZHAO Yongchao, CAO Yunxing. Fracture extension law of hydraulic fracture in coal with different structure[J]. COAL GEOLOGY & EXPLORATION, 2019, 47(2): 51-57. doi: 10.3969/j.issn.1001-1986.2019.02.009
Citation: JIA Qifeng, NI Xiaoming, ZHAO Yongchao, CAO Yunxing. Fracture extension law of hydraulic fracture in coal with different structure[J]. COAL GEOLOGY & EXPLORATION, 2019, 47(2): 51-57. doi: 10.3969/j.issn.1001-1986.2019.02.009

不同煤体结构煤的水力压裂裂缝延伸规律

doi: 10.3969/j.issn.1001-1986.2019.02.009
基金项目: 

国家科技重大专项课题(2017ZX05064-002)

详细信息
    第一作者:

    贾奇锋,1994年生,男,山西临汾人,硕士研究生,从事煤系储层改造方面的研究.E-mail:1322128315@qq.com

  • 中图分类号: TD353

Fracture extension law of hydraulic fracture in coal with different structure

Funds: 

National Science and Technology Major Project(2017ZX05064-002)

  • 摘要: 查明不同煤体结构煤水力压裂时裂缝延伸规律能为合理井网部署奠定基础。以沁水盆地柿庄区块为研究对象,对钻井煤心裂隙进行观测,划分出4种裂隙发育程度煤。基于岩体力学理论,建立了水力压裂过程中裂缝尖端应力场计算模型和水力裂缝能否穿过天然裂隙的判断准则。根据煤层气井实测资料,验证了理论分析的可靠性,得出了不同煤体结构煤的水力压裂裂缝延伸规律。结果表明:考虑诱导应力前后,2组天然裂隙发育煤的水力裂缝延伸规律不同,随着缝长增加,诱导应力随之增大,水力裂缝单一延伸方向变为双向延伸;1组天然裂隙发育煤的发育方向与最大主应力方向夹角较小,导致考虑诱导应力前后水力裂缝的延伸方向变化不明显,整体延伸趋于天然裂隙发育方向;在粒状偶见及粉状无裂隙发育煤中,水力裂缝总是沿着最大主应力方向延伸。研究成果为该区不同应力和裂隙发育下井网合理布置提供了理论依据。

     

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出版历程
  • 收稿日期:  2018-05-20
  • 发布日期:  2019-04-25

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