A borehole drilling rig is designed to lift and lower the drill string and casing in the well, retain the pressure exerted on the drill string during drilling, accommodate the drill block system and its parts, the pipe and the equipment needed for drilling.
When another drilling site for oil and gas is launched the professionals take advantage of using metal tower and mast rigs, and frankly speaking, mast construction are used more frequently in comparison with the tower ones. Such choice is explained by a less complicated and faster process of installation. Tower rigs are overwhelmingly erected for deep exploration, while mast rigs are installed for production purposes.
Derricks may differ in payloads and height. According to practice, drilling to a depth of 1200-1300m demands installing the 28m height rig, the wells of 1330-3500m need 41-42m rig to be mounted, while the projects exceeding 3,500m demand 53+ meters derricks.
Today the industry professionals do mostly resort to A-frame mast derricks, comprised of two columns connected at the top of the crown with connection blockers and attached at the bottom to support the hinges. A range of researches in geophysics as well as practical data confirms that the construction mentioned above is considered to be the most efficient one for residential systems.