Drilling rigs are composed of various systems, which has a specific task in drilling operations. Due to the fact that drilling methods has changed from impact to rotary drilling, drilling rig systems have become more complex and consist of more parts. Depending on the type and depth of drilling, the specifications of the formation etc. other drilling systems may be added to the below systems. In general, it can be said that each drilling rig consists of the following main systems.

Drilling rig systems