A drill line is a wire rope that helps drill or pump oil and gas from the ground. It is connected to the rig engine and travels through pulleys to increase drilling power. It should not be confused with the drill string, which is a separate mechanism. Drill lines can vary in length and diameter and can withstand extreme drilling conditions.
A drillline is a wire rope that is part of the operating system of an oil rig or derrick. These lines are made up of multiple wire rope components twisted together to form a thick, sturdy whole. The line can be galvanized or coated to protect it from the corrosive environment typically found around oil wells. The drill line plays an important role in enabling these rigs to drill or pump oil and gas from the ground and helps facilitate the up and down movement of the driller.
The end of the drill line is connected through the rig engine. This motor generates the force needed to raise and lower the drill assembly. From the engine, this line travels up to the top of the tower. It wraps around a series of pulleys, which are positioned on the crown block along the top of the rig. The drill line then extends down into the movable block, which contains a second set of pulleys. Together, these two pulleys make up the block and tackle of the rig.
By running the drill line through multiple sets of pulleys, oil operators are able to put additional force on the drill bit. The line and pulleys multiply the power generated by the motor to allow the drill mechanism to drill much deeper and through much harder materials. This allows the tower to produce the forces needed to cut rock deep underground. Some rigs may include a second set of sheaves fixed above the crown block to further increase drilling power.
The drillline should not be confused with the drill string, which is a separate, but equally important, mechanism on the medium tower. Drill strings consist of a hollow tube or conduit with a cutting bit attached to one end. The rig pumps drilling fluid through the center of the string to aid in the cutting process. The drill line generally supports the drill string and helps raise and lower it into the ground.
Drill lines can vary in length and diameter depending on the needs of each drilling project. Oil workers often add lengths of wire rope to the line to allow the drill to go deeper and deeper below the ground as the project continues. The surprisingly thin cables can withstand extreme drilling conditions, hard rock and great depths. Generally, thicker wires or wires made of stronger materials may be required for more advanced drilling operations.
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