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Unit 4
Rotary rig types

Answer the following questions.

1. What are the two main categories of rigs?
2. What are the differences between land rigs and offshore rigs?
3. What does the word “portability” mean?
4. Are both land and offshore rigs portable?
5. What is MODU?
6. What types of submersibles do you know?
7. Describe the structure of a bottle-type rig.
8. Which types of barges are sometimes called "swamp barges"?

Choose the correct answer.

1. There are two main categories of rigs. Fist one is land rigs. What is the second
one?
a) offshore rigs
b) ocean rigs
c) sea rigs
d) no correct variant

2. Some experts like to create a third category of rig. What is it?
a) land and sea rigs
b) multifunctional rigs
c) inland rigs
d) no correct variant

3. Classified by size, land rigs are light duty, medium duty, heavy duty, and …
a) high
b) very heavy duty
c) huge
d) no correct variant

4. A medium-duty rig could drill a … hole
a) 450-metre
b) 550-metre
c) 750-metre
d) no correct variant

5. A widely used offshore drilling rig is a mobile offshore drilling unit, or …
a) MOTU
b) MOBU
c) MODU
d) no correct variant

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