贵州金佳矿区复杂地层煤层气钻完井工艺研究  

Research on CBM drilling and completion technology of complicated strata in Jinjia Mining Area of Guizhou Province

作　　者：颜智华 胡海洋 娄毅 陈捷 何连稳 YAN Zhihua;HU Haiyang;LOU Yi;CHEN Jie;HE Lianwen(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 Panjiang CBM Development and Utilization Co.,Ltd.,Guiyang 550081,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]贵州盘江煤层气开发利用有限责任公司,贵州贵阳550081

出　　处：《煤矿安全》2022年第6期83-88,共6页Safety in Coal Mines

基　　金：贵州省地质勘查基金资助项目(2018-01号);贵州省科技计划资助项目(黔科合支撑[2020]2Y028号);国家科技重大专项资助项目(2016ZX05044)。

摘　　要：以金佳矿区煤层气井为例,总结煤系地层岩性变化特征及对煤层气井钻完井质量控制的影响,优化钻井施工参数,促进钻井煤层的低伤害及高效化。工程实践表明:金佳矿区煤层气勘查区煤层及顶底板岩性复杂,以砂岩、泥岩、砂质泥岩、泥质砂岩为主,煤层及顶底板组合分布可分为5种结构模型;勘查区龙潭组含煤地层适合采取20~30 kN的中低钻压、15~20 L/s的小排量、中高转速钻进,避免钻压过大造成井斜角过大;固井施工的水泥浆密度不易超过1.85 g/cm^(3),避免水泥浆密度过大侵入近井地带造成储层伤害。Taking coal-bed methane wells in Jinjia Mining Area as an example,the characteristics of coal-measure formation lithology changes and their influence on the quality control of CBM well drilling and completion are summarized,drilling construction parameters are optimized,and the drilling of coal seams is less harmful and more efficient.Engineering practice shows that the coal seams and roof and floor lithologies in the coalbed methane exploration area of Jinjia Mining Area are complex,mainly sandstone,mudstone,sandy mudstone,and argillaceous sandstone.The combined distribution of coal seams and roof and floor can be divided into 5 structural models;the coal-bearing strata of Longtan Formation in exploration area is suitable for drilling with medium-low drilling pressure of 20-30 kN,small displacement of 15-20 L/s,and medium-high speed drilling to avoid excessive drilling pressure caused by excessive well inclination;cement slurry density for cementing construction is not easy to exceed 1.85 g/cm^(3) to avoid the excessive density of cement slurry from invading the near-well zone and causing reservoir damage.

关 键 词：煤层气 钻井质量 复杂地层 结构模型 软硬互层 低伤害钻井 

分 类 号：TD712[矿业工程—矿井通风与安全]