Tender Assisted rigs are an existing type of development drilling, workover or plug & abandonment rig (same "family" as Jack Up, semi-submersible or drillship). It is however the only design that can operate in both Shallow and Deepwater (from 20 m to 2,000 m). It is recognized in the industry as one of the most efficient and economical types of rig for development, work over or plug & abandonment (P&A). They are composed of a tender vessel (a specially designed support vessel) and a self contained
drilling rigs. The tender vessel is typically equipped with storage facilities (bulk, mud, tubular, spare parts, consumables), living quarters (120 to 200 people), power generation facilities,
cranes
Crane or cranes may refer to:
Common meanings
* Crane (bird), a large, long-necked bird
* Crane (machine), industrial machinery for lifting
** Crane (rail), a crane suited for use on railroads
People and fictional characters
* Crane (surname), ...
, and helideck. Tender vessels are typically flat bottom
barges
Barge nowadays generally refers to a flat-bottomed boat, flat-bottomed inland waterway vessel which does not have its own means of mechanical propulsion. The first modern barges were pulled by tugs, but nowadays most are pushed by Pusher (boat) ...
or semi-submersible, however in some instances, it a jackup- or semi-submersible rig or liftboat was used.
[https://www.sapuraenergy.com/type/drilling/ See bottom of page under heading 'Tender rigs']
References
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Drilling rigs