摘要
在西部地区采用钻井法施工煤矿立井井筒,往往面临穿越第四系风积沙和萨拉乌苏组砂层的问题。由于该地层极其松散并且富水性强,如果不采取治理措施,容易发生松散层坍塌,引起溃砂突水涌入井筒,造成钻机基础失稳、井口下沉、钻机位移、井帮垮塌甚至井筒报废等严重后果。通过对第四系松散层治理的几种对策进行比较,在明确区域地质条件及钻井法适应条件的基础上,分析认为MJS工法(全方位高压喷射工法)在治理松散层方面是可行的。该工法具有安全可靠、质量可控、造价低、工期短等优点,在可可盖煤矿中央进、回风立井钻井法施工穿越第四系松散层治理中应用并取得良好效果。实践表明,将MJS工法应用于煤矿立井井筒钻井施工松散层治理的前景可期,值得推广至西部地区类似地层条件,能够为钻井法施工安全穿越第四系松散层创造良好的条件。
In the western area of coal mine shaft construction by drilling method,it is often faced with the problem of crossing the quaternary aeolian sand and the sand layer of salawusu formation.Because the formation is extremely loose and rich in water,if no treatment measures are taken,it is easy to collapse of the loose layer,resulting in sand burst and water inrush into the wellbore,resulting in instability of the rig foundation,wellhead sinking,rig displacement,well wall collapse and even wellbore scrap and other serious consequences.Through the comparison of several countermeasures for the treatment of quaternary unconsolidated strata,and on the basis of the clear regional geological conditions and the adaptive conditions of drilling method,it is analyzed that MJS method(all-directional high-pressure injection method)is feasible in the treatment of unconsolidated strata.This construction method has the advantages of safety,reliability,quality control,low cost and short construction period,etc.It has been applied in Kekegai Coal Mine central inlet and return air shaft drilling method through the management of quaternary system loose layer and achieved good effects.The practice shows that the application of MJS method to the treatment of unconsolidated strata in shaft drilling of coal mine has a promising prospect and is worth spreading to similar stratum conditions in western China,which can create good conditions for drilling method to safely cross the quaternary unconsolidated strata.
作者
白云飞
赵国良
BAI Yunfei;ZHAO Guoliang(Shaanxi Yanchang Petroleum Yulin Kekegai Coal Industry Co. , Ltd. , Yulin 719000,China)
出处
《陕西煤炭》
2022年第4期90-94,共5页
Shaanxi Coal
关键词
西部地区
钻井法施工
松散层加固
冻结法
全方位高压喷射工法
western area
construction by drilling method
loose layer reinforcement
freezing method
all-directional high-pressure injection method
