The document discusses open hole completion techniques in drilling, which include barefoot completions, pre-drilled liners, and zonal isolation methods. It highlights the advantages and disadvantages of barefoot completions, the use of external casing packers and swellable elastomer packers, and the importance of mitigating formation damage during the process. Additionally, it addresses the need for effective design to avoid reservoir fluid interactions and outlines the role of solids in managing filtration and plugging.

1. 1
Lecture# 03
Open Hole Completion
Techniques

2. 2
Open Hole
Completion Techniques
1. Barefoot Completions
2. Pre-drilled and Pre-slotted Liners
3. Zonal Isolation Techniques
4. Formation Damage Tendency and Mitigation

3. 3
Barefoot Completion
Advantages
o Low cost
o Easier interventions (sidetracking, deepening,…)
o Easier water and/or gas shut off

4. 4
Disadvantages
o Borehole Collapse
o Inability to deploy upfront zonal isolation equipment
(e.g. swellable elastomer packer)

5. 5
Open Hole
Completion Techniques
1. Barefoot Completions
2. Pre-drilled and Pre-slotted Liners
3. Zonal Isolation Techniques
4. Formation Damage Tendency and Mitigation

6. 6
Pre-drilled / Pre-slotted
Liners

7. 7
Purposes
o Stop gross hole collapse
o Allow to deploy zonal isolation packers
o Allow to deploy intervention tool strings such as
production logs (PLTs)

8. 8
Open Hole
Completion Techniques
1. Barefoot Completions
2. Pre-drilled and Pre-slotted Liners
3. Zonal Isolation Techniques
4. Formation Damage Tendency and Mitigation

9. 9
Zonal Isolation
Techniques
I. External Casing Packers (ECPs)
II. Swellable Elastomer Packers

10. 10
External Casing Packers
(ECPs)

11. 11
ECPs
Considerations
o Full integrity under downhole conditions using mud
for inflation
o ECPs inflated with cement

12. 12
Zonal Isolation
Techniques
I. External Casing Packers (ECPs)
II. Swellable Elastomer Packers

13. 13
Swellable Elastomer
Packers
o Run in an inert fluid like brine
o Elastomers swell by diffusion
in presence of reservoir fluids

14. 14
Swellable Elastomer
Packers
o Full expansion up to 40 days
o Used in series for additional assurance of a seal
o Trading-off between running clearance and sealing
pressure
o Sealing pressure up to 4,000 psi

15. 15
Advantages
(over ECPs)
o Greater simplicity and lower costs
o Not need a washpipe
o More effective in high temperature
o Tight clearances when running in hole (about 0.15
inch radial clearance)

16. 16
Open Hole
Completion Techniques
1. Barefoot Completions
2. Pre-drilled and Pre-slotted Liners
3. Zonal Isolation Techniques
4. Formation Damage Tendency and Mitigation

17. 17
Formation Damage
o Open hole completions are prone to formation
damage
o Design filtrate to avoid interactions with reservoir fluid
or rock
o Filter cake limit depth of invasion of filtrate by quickly
building up an impermeable layer

18. 18
In General
Any Fluid that is likely to Contact Reservoir Rock should
have Solids that either Bridge or Invade without
Plugging

19. 19
Role
of Solids
in
Bridging
and
Plugging

20. 20
Irregular C
lean-up
Horizontal W
ell

21. 21
Thank You
Any Question
?