Oil Country Tubular Goods are tubes which used in oil and gas production.
Drill pipe is heavy seamless tube that rotates the drill bit and circulates drilling fluid.
Casing is main parts of the well construction.
Tubing is pipes located in the bore and oil or gas is transported from the wellbore.
• Casing
• Tubing
• Drill Pipe
• Drill Collar

Some problems may occur while drilling an oil well. drill string or bit breaks and falls to the bottom of the wellbore. Even pipe or a tool can fall from the rig floor into the bottom of the well. Drill bits cannot drill through fallen equipment. So fishing tools used to remove them and including:

• catch tools
• fishing stroking tools
• milling and cutting tools
• Packer milling & junk retrieval tools