DQ-76型连续造斜绳索取心钻具的研制及应用

Development and Application of DQ76 Continuous Deflecting Wire-line Coring Tool Assembly

介绍了DQ-76型连续造斜绳索取心钻具的结构特点、工作原理及造斜率预测方法,作者采用纵横弯曲法计算该取心钻具的造斜能力,并对其造斜率进行预测。该钻具由打捞机构、仪器管、分动机构、卡固机构、造斜机构、传扭管、取心管、扩孔器以及取心钻头等部分组成。该钻具的造斜强度在地面进行调节,通过泵压控制分动机构和卡固机构的运动,保证造斜过程中钻具在井底的有效卡固。通过该钻具在云南某煤矿3口井的现场应用,分别调节钻具造斜机构的偏心距为0.5mm、1.0mm及1.5mm来试验钻具的实际造斜能力及取心参数,结果证明:①试验钻具能满足连续造斜的同时实现绳索取心;②钻具造斜强度能够通过更换偏心套来改变;③利用纵横弯曲法预测极限造斜率时,修正系数可取0.7～0.93。

This paper presents the configuration feature,work principles and prediction method of deflection rate of the DQ-76 continuous deflecting wire-line coring tool assembly.We forecast the deflection rate of the tools by using beam-column theory.The tools consists of salved set,measurement set,action set,locking set,deflecting set,drive tube,inner tube,expanding set and coring bit.The deflecting rate of the tool can be adjusted on the ground.The action of action set and locking set are controlled by pump pressure to ensure the tools to be locked effectively during the process of drilling in boreholes.This tool set has been used at three boreholes in Yunnan province with eccentricity of 0.5 mm,1.0 mm and 1.5 mm,respectively.The result shows that this tool can realize deflecting as well as coring simultaneously.Deflecting strength can be regulated by eccentric house.And the value of correction coefficient is 0.7-0.93,if the ultimate deflecting rate is calculated by beam theory.