某井从3048m起钻,起出2621m管柱后,发现溢流并关井,测得Pa=7MPa,井内加重管柱外径165mm,内63.5mm,长度122m,单位密度为143kg/m,管柱外径为114mm,单位密度24.7 kg/m,接头外径156mm,工作液密度1.56kg/cm3,摩擦力取90kN,计算井内现有钻铤,钻杆,钻具有效重量为( )KN
A.141.2 B.159.6 C.178.9 D.196.1正确答案D
某井从3048m起钻,起出2621m管柱后,发现溢流并关井,测得Pa=7MPa,井内加重管柱外径165mm,内63.5mm,长度122m,单位密度为143kg/m,管柱外径为114mm,单位密度24.7 kg/m,接头外径156mm,工作液密度1.56kg/cm3,摩擦力取90kN,计算井内现有钻铤,钻杆,钻具有效重量为( )KN
A.141.2 B.159.6 C.178.9 D.196.1正确答案D