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黑龙江省某煤田属永久冻结区。冻结深度为60～120米，季融层最大深度1.9米。永冻地区地层与一般地层相比有某些差异，因而钻探工艺特点也有所不同，下面谈谈我们对永冻地区煤田钻进工艺的初步认识。一、煤田地层情况第四系：由各类型的残、坡、冲、湖积物构成，含有大量鹅卵石、转石，大部分地区底层为1～2米厚的呈冻结状态的砂层。第四系平均厚度10米左右，最大厚度可达20米。
A coalfield in Heilongjiang Province is a permanently frozen area. Frozen depth of 60 to 120 meters, quarter maximum depth of 1.9 meters. There are some differences between the geothermal formations in the Yongkui area and those in the general strata. Therefore, the characteristics of the drilling technology are also different. Let’s talk about our initial understanding of the coalfield drilling technology in the Yongkong area. First, coalfield strataQuaternary: by the various types of residual, slope, red, lake sediment composition, contains a large number of pebbles, trilobite, most of the bottom layer is 1 to 2 meters thick was frozen sand. Quaternary average thickness of about 10 meters, the maximum thickness of up to 20 meters.