초록 ▼

A drilling head comprises a tubular body adapted for connection above a well head and having a removable side outlet with a replaceable wear bushing. An assembly removably secured in the head includes a stator and rotor with bearing means and rotating seal means therebetween. A replaceable tubular,

A drilling head comprises a tubular body adapted for connection above a well head and having a removable side outlet with a replaceable wear bushing. An assembly removably secured in the head includes a stator and rotor with bearing means and rotating seal means therebetween. A replaceable tubular, kelly seal boot or stripper carried by the rotor includes an enlarged upper end which diverts drilling mud away from the rotating seal and toward the side outlet.

대표청구항 ▼

A drilling head said portion of the wear sleeve being freely withdrawable from said body with said side outlet when said side outlet is released, whereby when said side outlet and wear sleeve are removed the remainder of the drilling head can be lowered through the master bushing receiving opening o

A drilling head said portion of the wear sleeve being freely withdrawable from said body with said side outlet when said side outlet is released, whereby when said side outlet and wear sleeve are removed the remainder of the drilling head can be lowered through the master bushing receiving opening of a rotary table provided for rotating such a drive tube, said remainder of the drilling head having a maximum transverse dimension no larger than the minimum transverse dimension of said opening in the rotary table.