Rig types and basic drill string components. Part 4. Special drill string equipment.

[@veerapongkhunsun5517]

This is very useful information for me in being just the first year of Petroeum's diploma in Thailand becaue I would like to work in this field in the future and so for that resoan I will prepare myself as much as I can.Thank you very much sir.^^

[@JoseColombia]

You are welcome

[@kanansuleyman2909]

Did you graduate? :D