城郊煤矿底板改造钻孔偏斜规律研究

Study on borehole deflection law of floor reconstruction in Chengjiao Coal Mine

目前煤矿钻孔中容易被忽视的钻孔偏斜问题日显突出,影响钻孔施工的安全和效果。城郊煤矿存在着复杂的地质特征,断层构造带、含水组以及隔水组等发育。为查明钻孔终孔位置,降低钻孔偏斜,通过分析矿用回转钻机测斜仪工作原理,对城郊煤矿钻孔实施过程中的测斜数据进行采集,并对钻孔测斜的环境影响因素和系统误差影响因素进行了分析。对钻孔左右偏斜规律和钻孔上下偏斜规律进行了研究,得出钻孔偏斜在钻进方向岩层倾向、钻具自转方向双重因素影响的结果,钻孔上下偏斜受钻孔角度、钻进方向岩层角度、煤层底板岩性变化及钻杆自重因素影响。通过制定相应的预防措施,可减轻钻孔偏斜程度,实现钻孔施工的精准控制,使钻探施工做到有章可循,提高钻探施工效果。

At present,the problem of borehole deviation which is easy to be ignored in coal mine drilling is becoming more and more prominent,which affects the safety and effect of drilling construction.There are complex geological characteristics in Chengjiao Coal Mine,such as fault structure belt,water bearing formation and water resisting formation.In order to find out the final position of the borehole and reduce the borehole deviation,through analyzing the working principle of the inclinometer of the mine rotary drilling rig,the inclinometer data in the process of drilling in Chengjiao Coal Mine were collected,and the environmental factors and system error factors of borehole inclinometer were analyzed.This paper studied the law of borehole left and right deviation and the law of borehole up and down deviation,and obtains the result that the borehole deviation was affected by the double factors of drilling direction,strata inclination and drilling tool rotation direction.The borehole up and down deviation was affected by drilling angle,drilling direction strata angle,coal seam floor lithology change and drill pipe self weight.Through the development of corresponding preventive measures,the degree of borehole deviation can be reduced,the precise control of drilling construction can be realized,the drilling construction can be regulated,and the drilling construction effect can be improved.