Both of drill pipe and drill collar are significant oilfield tubular goods. But what is the difference between drill pipe and drill collar? Continue reading to learn more.
Drill Pipe:
A drill pipe is a long hollow steel tube used to rotate the drill bit and circulate drilling fluid in the well. It is made of alloy steel and has a threaded connection at each end, called a tool joint, which allows it to be screwed together with other drill pipe sections or with other drill stem components, such as a drill collar.
Drill Collar:
A drill collar is a short, heavy section of drill pipe that is added to the bottom of the drill string to provide weight on the bit. It is made of high-strength steel, such as alloy steel or tungsten carbide, and is used to keep the drill string straight and transmit drilling torque to the bit.
The drill collar is located in the lower part of the drill string and is the main part of the lower drill tool assembly. The main feature of drill collars is their relatively large wall thickness, typically 38-53mm, which is equivalent to 4-6 times the wall thickness of the drill pipe. This results in greater gravity and rigidity. There are three types of drill collars: spiral, non-magnetic, and integral.
Difference Between Drill Pipe And Drill Collar:
The drill collar is thicker and heavier than the drill pipe. It is connected to the drill bit at the lower end and to the drill pipe at the upper end. The drill pipe transmits motion and power, while the drill collar directly drives the drill bit. The drill pipe transmits motion and power, while the drill collar directly drives the drill bit. The drill pipe transmits motion and power, while the drill collar directly drives the drill bit. Both have similar functions, but the drill collar is stronger.
Post time: Dec-21-2023