保德区块煤层气丛式井快速钻井技术研究

保德区块位于鄂尔多斯盆地东缘,构造位置属于晋西褶曲带北段。该区块地层岩性以泥岩和砂岩为主,岩石硬度高,可钻性较差,钻井速度慢。由于煤层气开发具有低产多井的特点,随着保德区块大规模产能建设启动,对钻井进度提出了很高的要求,因此需要研究丛式井快速钻井技术。依据保德区块的地层条件,分析测井资料,从钻头选型、钻具组合、钻井液性能和施工工艺几个方面出发,研究保德区块快速钻井技术。通过理论研究和现场试验,提出了一套适合保德区块丛式井施工的钻井工艺技术,为保德区块煤层气大规模开发奠定良好的技术基础。

Research on Faster Drilling Technology of Coal-bed Methane Cluster Wells

Baode block is located in the north part of east Ordos basin and geotectonic location is at the north section of folded zone in west Shanxi. Through the analysis on former drilling data, the lithology of the formation in Baode block is mainly composed of mudstone and sandstone with high hardness, bad drillability and low drilling speed. As the development of coal-bed methane is characterized by low production and abundant wells and with the startup of large-scale production construction in Baode block, drilling speed plays a very important role and the research on fast drilling technology for coal-bed methane cluster wells is required. According to the geological conditions, on the basis of the existing drilling and logging data, the fast drilling technologies were studied in bit selection, bottom hole assembly optimization, drilling fluid property and construction technology. Through theoretical research and on-site experiment, a set of drilling technologies for cluster wells in Baode block has been put forward, which laid technical foundation for large-scale coal-bed methane production in this area.