A heavy, thick-walled tube, usually steel, used between the drill pipe and the bit in the drill stem to weight the bit in order to improve its performance is called a ______.
A
heavy-walled drill pipe
B
tool joint
C
down hole tool
D
drill collar
E
İlgili Sorular
The officer responsible for the sanitary condition of the engineering department is the ____________...Motor-propelled lifeboats are required to be fitted with which of the following?The SS AMERICAN MARINER is partially loaded with a GM of 3.1 feet and drafts of: FWD 16'-00", AFT 18...What is the light characteristic of a lighted, preferred-channel buoy?BOTH INTERNATIONAL & INLAND The rules state that vessels may depart from the requirements of the Rul...