Many people ask us about the definitions of the various generations of offshore drilling rigs. The details below consist of the definition of offshore rig types and meaning of rig generations. This will help us get more understanding so when we hear about this drillship is 5th generation rig and we will know right away what it means.
Self- elevating jack up are mobile, self-elevating drilling platforms that are equipped with moveable legs. Jack ups are towed to a drilling site by tug boats before the unit lowers its legs to the seabed and then jacks up the hull to elevate it above the sea level, after which drilling operations can begin. The units are used exclusively for shallow water exploration and production drilling.
A semi-submersible drilling rig is a floating drilling rig that is proficient of working in water depths ranging from shallow through to ultra-deepwater. Semi-submersibles use a number of pontoons that are submerged beneath the water line to float and remain stable in a single location. The deck is positioned above the water line and sits on top of a number of columns that join the hull to the submerged pontoons. Semi-submersibles offer an increased level of stability whilst drilling in comparison to drill ships and are thus preferred for drilling in harsh environment regions.
A drillship is a ship-shaped vessel that has been prepared for drilling operations. The unit can be utilized for drilling operations in mid water to ultra-deepwater areas and are generally preferred for exploration drilling as the assets are self-propelled. Drillships are kept on station using dynamic positioning systems.
Tender assist drilling units (Tender/Semi-Tender)
Tender assist drilling units (TADs) allow drilling operations to be carried out on a fixed platform without the need for a permanent drilling package on the platform. The TAD is stationed next to the platform and its drilling enclose is lifted onto the platform. The TAD remains in place in order to provide power and other services that support the drilling operation. There are two diverse types of TADs, a tender rig, and semi-tender, both units carry the same equipment but the semi-tender is capable of operating in deeper waters and harsher environments.
Types of oil drilling rigs
Getting down to the basics, there are several types of offshore oil rigs designed to work in a variety of locations, on certain kinds of wells, and differing environments:
- Jack-ups are moveable drilling structures with bottom supports. Jack-ups have open-truss or columnar legs in support of their main deck or hull area.
- Platforms cannot be moved like Jack-ups. They are immobile. Platforms are typically made from steel or cement and are used to drill new development wells.
- Semisubmersibles drilling units, or Floaters, stay afloat offshore on giant pontoons or hollow columns. When overflowing with water, the pontoons or columns will partly submerge the unit to the desired Floaters are reliable in rough seas and most frequently used for drilling new wells. To find out more about our wind farm maintenance check here.