Temporary Guide Base
Definition - What does Temporary Guide Base mean?
A Temporary Guide Base is a flat steel structure that is lowered to the seabed and held in place by a dagger skit. It serves as a template for drilling the outer conductor hole. At least four vertical guide posts are located at the corners of the guide base. The drill string is used to first lower the temporary guide base and then a guide frame to seabed. These two units are used to position the drill bit. The temporary guide base is always the first item to be lowered to the seabed.
Petropedia explains Temporary Guide Base
Temporary guide bases anchor guidelines from the drilling platform. After drilling unit’s anchors have been deployed at the drilling location, the temporary guide base is then lowered to the seabed. This serves as a foundation for all the other subsea equipment and tools that follow. The temporary guide base (TGB) is a circular, hexagonal, octagonal or squire flat steel framework and is usually located on top of a subsea well. The guide frame is lowered to seabed after lowering the TGB. These two units are used to position the drill bit. The outer conductor with a permanent guide base is then lowered on guidelines onto the temporary guide base and fixed.