Liner Flashcards
1
Q
what is a Liner?
A
Any string of casing whose top is located below the surface, hung inside the previous casing and is run to its setting depth by drill pipe.
2
Q
Why Liners ?
A
- Reduce cost (Casing cost)
- Reduce rig time
- Reduce slurry cost
- Cover corroded / damaged casing
- Isolate problematic zones quickly during drilling
- Deep wells
- Low Frac gradient (CMT to surface may cause losses)
- Larger casing above the liner Increases completions options
3
Q
Type of Liners
A
- Production liner
- Intermediate/drilling liner (deep wells)
- Tieback stub liner
4
Q
Liner Components
A
- Surface component :
- Cement head (including drill pipe Dart)
- Ball to set liner
- Sub-surface components :
- Running string (DP / HWDP / running tool)
- Liner hanger
- Liner tubular
- Floating accessories
- Landing collar
5
Q
Types of Liner Hanger
A
Setting mechanism :
- Hydraulic
- Mechanical
Rotating and Non Rotating liner hangers
6
Q
liner hanger Setting Procedure
A
- RIH liner with drill pipe
- At liner hanger depth, condition mud (Reciprocation / Rotation)
- Release slips (liner hanger) (Rotation – mechanical or pressure – hydraulic)
- Set slips, release liner weight,
- check to see if running tool is free
- Pump mud - to ensure free circulation
7
Q
Liner Cementing Job Procedure
A
- Pressure test lines
- Pump wash and/or spacer
- Pump cement slurry
- Drop “Dart” (drill pipe wiper dart)
- Displacement: Start displacement at designed rate
- Slow down 2 BPM +/-10 bbls before shearing “Liner Wiper Plug” pins
- Continue displacement at designed rate (Dart and LWP together)
- Slow down 2 BPM +/- 10 bbls before bump the LWP
- Bump plug, pressure test liner, bleed off check for returns
- Release running tool,
- POOH above TOC or TOL and reverse circulate any excess cement
8
Q
Is so critical to have a good cement in the overlap of the liner because is over the production zone?
A
no
