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,关井后,在换成环形防喷器之前应关井下入的钻具有效重量为( )KN
A.27.64 B.141.2 C.159.6 D.161.4正确答案A
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,关井后,在换成环形防喷器之前应关井下入的钻具有效重量为( )KN
A.27.64 B.141.2 C.159.6 D.161.4正确答案A