天然气地球科学

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碎软低渗煤层顶板水平井分段压裂高效抽采煤层气技术研究

贾建称,陈晨,董夔,吴艳,吴敏杰   

  1. 1.煤炭科学研究总院,北京 100013;2.中煤科工集团西安研究院有限公司,陕西 西安 710054
  • 收稿日期:2017-08-16 修回日期:2017-10-27 出版日期:2017-12-10 发布日期:2017-12-10
  • 作者简介:贾建称(1965-),男,陕西丹凤人,研究员,博士生导师,博士后,主要从事煤与煤层气地质及勘探开发研究.E-mail:jianchengjia@163.com.
  • 基金资助:
    国家科技重大专项课题(编号:2016ZX05045-002)资助.
     

Research on the technology of high efficient to drainage CBM by multistage fracturing in horizontal well along the roof of broken soft and low permeability coal seam

Jia Jian-cheng,Chen Chen,Dong Kui,Wu Yan,Wu Min-jie   

  1. 1.China Coal Research Institute,Beijing 100013,China;
    2.Xi’an Research Institute of China Coal Technology & Engineering Group Corp.Ltd.,Xi’an 710054,China
  • Received:2017-08-16 Revised:2017-10-27 Online:2017-12-10 Published:2017-12-10

摘要:

中国碎软低渗煤层发育,气含量高,资源潜力大,瓦斯压力大、煤岩力学强度低、顺煤层钻进成孔困难,“有气难出”一直是困扰这类煤层气高效开发和矿井瓦斯治理的关键科学技术问题。芦岭煤矿8煤层为碎软、高瓦斯、突出、低渗、难抽采煤层,顶板可钻性较好。引进水平井分段压裂技术,沿煤层顶板施工水平井,采用“泵送桥塞封隔分段、多段多簇定向射孔、逐段分步定向压裂”等成套开发技术,以及“先低后高、先细后粗”的加砂工艺,适时应用段塞式加砂技术,在煤层中形成了多组具有高渗流能力的北东向垂直主裂缝带。经过精细排采,创造了煤层气水平井日产气量超万立方米的纪录。碎软低渗煤层顶板水平井分段压裂技术的成功应用,突破了“构造煤是煤层气开发禁区”的观念,填补了难抽采突出煤层区地面煤层气高效开发和矿井瓦斯治理技术的空白。

关键词: 分段压裂, 定向射孔, 水平井, 碎软低渗煤层, 芦岭煤矿

Abstract:

Broken soft and low permeability coal seam,with high gas content,high gas pressure,grant resource potential,and low mechanical strength,developed well in China.Formation of hole along the coal seam drilling is difficult,and the key science and technology problem in CBM efficient development and the mine gas control of this coal seam area have always been difficult to extract gas.No.8 coal seam of Luling coal mine is in broken soft,high gas,outburst,low permeability,difficult extraction,easy drill ability of roof.Introducing horizontal well and multistage fracturing techniques,constructing horizontal well along the coal seam roof,using a complete set of developing techniques: pumping bridge plug multistage,multistage clustering directional perforation,piecewise directional fracturing step by step,and adopting the sand technologies of first low to high,first coarse to fine,applying slug-style sand technology duly,multiple sets of north-east main vertical fracture belts with high seepage ability were formed in the coal seam.Through fine drainage management technology,the horizontal well creates a record that daily CBM production is more than ten thousand cubic meters.The successful application of multistage fracturing in horizontal well along the roof of broken soft and low permeability coal seam,breaking through the concept that “structure coal is forbidden zone to develop CBM”,filling the techniques gap in surface CBM efficient development and coal mine gas control of difficult extracting coal seams area.

Key words: Multistage fracturing, Oriented perforating, Horizontal well, Broken soft and low permeability coal seam, Luling coal mine

中图分类号: 

  • 132.2

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