贵州省煤层气井压裂改造对产气量的影响及开发建议——以盘关向斜为例  

Influence of fracturing reconstruction of coalbed methane wells on gas production and development suggestions in Guizhou Province:taking Panguan syncline as an example

作　　者：胡海洋 颜智华 娄毅 杜志刚 李全中 陈捷 高为 HU Haiyang;YAN Zhihua;LOU Yi;DU Zhigang;LI Quanzhong;CHEN Jie;GAO Wei(Guizhou Research Center of Shale Gas and CBM Engineering Technology,Guiyang 550081,China;Geological Exploration Research Institute,Guizhou Bureau of Coal Geological Exploration,Guiyang 550081,China;Guizhou Provincial Key Laboratory of Coal Fluidized Mining,Guiyang550014,China;School of Mineral Resource and Geoscience,China University of Mining and Technology,Xuzhou 221008,China;Guizhou PanjiangCoalbed Methane Development and Utilization Co.,Ltd.,Guiyang 550081,China;Civil Engineering Department,Luoyang Institute of Science andTechnology,Luoyang 471023,China;Mining Engineering Department,Shanxi Institute of Technology,Yangquan 045000,China)

机构地区：[1]贵州省煤层气页岩气工程技术研究中心,贵州贵阳550081 [2]贵州省煤田地质局地质勘察研究院,贵州贵阳550081 [3]贵州省煤炭流态化开采重点实验室,贵州贵阳550014 [4]中国矿业大学资源与地球科学学院,江苏徐州221008 [5]贵州盘江煤层气开发利用有限责任公司,贵州贵阳550081 [6]洛阳理工学院土木工程学院,河南洛阳471023 [7]山西工程技术学院矿业工程系,山西阳泉045000

出　　处：《煤炭科学技术》2024年第S01期116-126,共11页Coal Science and Technology

基　　金：贵州省科技计划资助项目(黔科合支撑[2024]一般054,黔科合平台人才-CXTD[2022]016,黔科合战略找矿[2022]ZD001-03)。

摘　　要：贵州省含煤构造单元多、煤层层数多、厚度薄,多为低渗储层,宜采取“分段压裂、合层排采”工艺进行煤层气开发。研究以盘关向斜煤层气井为例,在分析2口直井压裂改造规模的基础上,分析其压裂效果,进而研究了压裂改造效果对煤层气井气水产出的影响,最后总结了盘关向斜煤层气井高效改造压裂施工参数的合理阈值。结果表明:水力压裂是低渗储层增渗的有效途径,增渗倍数与压裂改造规模密切相关,盘关向斜2口井每米煤层的加砂量、加液量及单孔排量的差异,导致压裂改造后与改造前的渗透率比值为55∶1,改造后渗透率差异较大;提高每米煤层的加液量、加砂量及单孔排量,对提高煤层的改造效果及产气量有利,建议每米煤层加液量不宜低于400 m^(3),每米煤层加砂量不宜低于20 m^(3),压裂施工排量不低于8 m^(3)/min,且单孔排量宜控制在0.2 m^(3)/min以上;根据压裂改造后的煤层渗透率,针对改造效果好的煤层气井,可以适当快排降压,反之则应控制排采强度,降低快排降压可能引起的储层敏感性伤害。研究成果可以为该区块低渗煤层增渗增能改造提供技术参考。In Guizhou Province,there are many coal-bearing structural units,many layers of coal,thin thickness,and most of them are low permeability reservoirs,so it is advisable to adopt the process of“staged fracturing and combined layer drainage and production”to devel-op coalbed methane.Taking Banguan syncline coalbed methane well as an example,this study analyzed the fracturing effect of two vertic-al Wells on the basis of the scale of fracturing reconstruction,and then studied the influence of fracturing reconstruction effect on the gas and water production of coalbed methane Wells,and finally summarized the reasonable threshold of efficient fracturing construction para-meters of Banguan syncline coalbed methane Wells.The results show that hydraulic fracturing is an effective way to increase permeability of low permeability reservoir,and the permeability increase multiple is closely related to the scale of fracturing reconstruction.The differ-ences of sand addition,liquid addition and single-hole displacement per meter of coal seam between the two Wells of Banguan syncline lead to the permeability ratio of 55∶1 after fracturing reconstruction,and the permeability difference after reconstruction is large.Increas-ing the liquid addition,sand addition and single hole displacement per meter of coal seam is beneficial to improving the transformation ef-fect of coal seam and gas production.It is recommended that the liquid addition per meter of coal seam should not be less than 400 m^(3),the sand addition per meter of coal seam should not be less than 20 m^(3),the fracturing construction displacement should not be less than 8 m^(3)/min,and the single hole displacement should be controlled above 0.2 m^(3)/min.According to the permeability of the coal seam after fracturing and reconstruction,it can be appropriate to quickly discharge and depressurize the coalbed methane Wells with good reconstruc-tion effect.Otherwise,the intensity of discharge and production should be controlled to reduce the sensitivity damage of the

关 键 词：煤层气井 分层压裂 排采控制 气水产出 开发建议 

分 类 号：P618[天文地球—矿床学] TD845[天文地球—地质学]