This document discusses different types of drilling rigs used on land and offshore. It describes land rigs as heavy, light, portable, and conventional. Offshore rigs include floating rigs like drill ships and semi-submersibles, bottom-supported rigs like jack-ups and fixed platforms, and barge and submersible rigs. It then compares stationary and mobile land rigs, noting stationary rigs have advantages like faster tripping speeds but require more investment, while mobile rigs have less investment costs but slower tripping speeds and drilling depth restrictions.

1. Rig types
I n t r o d u c t i o n t o w e l l d r i l l i n g
Drilling

2. Typesof drillingrigs
Heavy Land rig floating
Land rig Marine Rig
Light Land rig
Portable Land rig
Bottom supported
Semi Sub
Drill ship
barge submersible
platform
jack up

3. Rigs
Marine Land
Bottom
Support
Semi/
Submersible
FLoating MobileConventional
Platform
Drill ship
JackupBarge
Self -
Contained
Tendered
Jacknife
(Deeper)
Portable Mast
(Small)

4. Marine RigsO f f s h o r e

7. Floating rig
Semi Submersible Rig

8. Floating rig
Drill ship

9. Floating rig
Drilling barge

10. Bottomsupported
jack up

11. Bottomsupported
Fixed platform

15. Bottomsupported
Submersible Rig

16. Land RigsO n s h o r e

17. Conventionalrig
Onshore

19. portabledrillingrigs
Onshore

20. STATIONARY DRILLING RIGS MOBILE DRILLING RIGS
Advantage:
Stands in the tripple – faster tripping
 Porefull equipment – drawwork over 1000 HP, mud
pumps over 1000 HP
Uses 5” DP – at greater depth less pressure losses.
Havy casing string run deeper –Hook loads over 200 t
Diesel electric drive.
Flexible range of RPM and SPM
Substructure higher and drilling floor greater area.
DP length upper limit for range
Better Contractor’s References.
Disadvantage:
 Greater investmens at start
More days for moving
More truck loads
Longer rigging up
Large surface of well site
More personnel –more experienced and specialist
Havy drilling and handling equipment
More investment for spare part stock
Advantage:
 Smaller investment at start
 Faster moving
Less truck loads
Less area for well site
Smaller waste pit
Less number of drilling crew
Less sparet parts stock
Disadvantage:
 Stands in the double- slow triping
 When drill deeper with 4 ½” DP or less, greater pressure
drops.
 Restricted running depth of intermediate casing if well
construction is complex due overpressure and lost circulation
zones.
 Mostly mechanical rigs – high noise level.
 Mud pump SPM restricted due drive diesel engine.
Required 3
liner size
Restricted height bellow rotary table for BOP stack
Less surface of drilling floor – safety
DP length restricted on bottom length limit.
If compare stationaru and mobile drilling rig we can notice following advantage- disadvantages: