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Transcript of 29371120-Liner
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2 Liner
Liners Any string of casing whose top is located below
the surface, hung inside the previous casingand is run to its setting depth by drill pipe.
LINER
HANGE
R
CASING
SHOE
OVERLAP
50 - 500 FT
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3 Liner
Why Liners ?
Prime reason:
± Save $$
± (Cost of 1 Joint of Casing can be $3,000!)
Cover Corroded/Damaged Casing
Cover:
± Lost Circulation Zones.
± Shales or Plastic Formations ± Salt Zones
Deep Wells:
± Rig Unable to Lift Long String of Casing.
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4 Liner
Types of Liners
Production:
± Most common
± Save $$
± Slotted liner
Intermediate/drilling:
± Cover problem zone in order to be able tocontinue drilling
Tie-back/liner complement:
± From top of existing liner to surface, or further upcasing to cover corroded or damaged zone.
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5 Liner
Tie-Back (Liner Complement)
The integration of the liner with casing run to surfaceThe integration of the liner with casing run to surface
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6 Liner
Tie-Back (Liner Complement)
The integration of the liner with casing run to surfaceThe integration of the liner with casing run to surface
TIE BACK
STINGER WITH
SEALS
LINER
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7 Liner
Tie-Back (Liner Complement)The integration of the liner with casing run to surfaceThe integration of the liner with casing run to surface
This is often done if production is commercially viableThis is often done if production is commercially viable
or there is damage to casing above the liner or there is damage to casing above the liner
TIE BACK
STINGER WITH
SEALS
LINER
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8 Liner
Hardware
DP Wiper Plug Liner
or Dart Hanger
Landing Collar/Plate
Casing Shoe
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9 Liner
Hardware
Running
Tool
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Procedure for Setting Liner
RIH with drillpipe At liner hanger depth, condition mud
± (Reciprocation / Rotation) Release slips (liner hanger)
± (Rotation - mechanical pressure - hydraulic) Set slips, release liner weight, check to see if running tool is
free Pump mud - to ensure free circulation Cement / Displace / Bump plug / Bleed off
Release setting tool POOH above TOC and circulate
± NOTE: A liner swivel can be run below the hanger toensure that the tool can be rotated even if the liner is stuckor set.
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12 Liner
Job Procedure Liner
Pressure test lines.
Pump wash/spacer.
Pump slurry.
Drop "Pump Down" plug (or drill pipe wiper dart). Displace
± To running tool
± Shear "Wiper Plug´
± Displace to Float Collar
Bump plug/check for returns.
Release tool.
Pull up to T.O.C. and circulate.
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13 Liner
Liner Overlap
Cementing the liner ³lap´ is critical .
Too much cement above the liner hanger is notrecommended
So make sure that ³uncontaminated´ cement ispresent at the liner lap - washes and spacers /WELLCLEAN II
If not, there is communication from the annulusto the formation
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14 Liner
Recommendations for Liner
Cementing Ensure rheology of cement system is adequate
for 100% mud removal
Turbulent flow, if possible
Consider 5 - 10 min. ³contact time´ at liner lap
Batch mix cement
Minimize U-tubing effect
Rotation of liner during cementing (specialbearing in tool)
Adequate mud conditioning prior to cementing
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Example Calculation - Liner
Well Information:
± 9-5/8" 47 lb/ft intermediate casing from surface to 6500 feet
± 7" 29 lb/ft intermediate liner from 6200 ft to 10,500 feet
± 6" open hole to TD at 14,500 feet
± Drill pipe 3-1/2" 13.30 lb/ft
± 4-1/2" 16.60 lb/ft liner required from 14,400 ft to 400 ft
inside 7" liner.
± Float collar 80 feet above shoe.
Cement required to top of liner with 20% excess in open
hole
Calculate:
±
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Production Liner Cementing Job
3 1/2´ drill pipe 13.3 lb/ft
9 5/8´ casing shoe at 6500 ft
7´ liner 29 lb/ft
Top at 6200 ft
9 5/8´ casing 47 lb/ft
7´ liner shoe at 10500 ft
6´ Open hole + 20% Excess
4 1/2´ liner 16.6 lb/ft
top at 10100ft
Collar at 14320 ft
4 1/2´ liner shoe at 14400 ft
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Liner Example Calculations - Results
Slurry Volume:
Volume #1: 0.0981 ft3/ft x 400 ft = 39.2 ft3
Volume #2: 0.0859 ft3/ft x 3900 ft x 1.20 = 402 ft3
Volume #3: 0.0769 ft3/ft x 80 ft = 6.2 ft3
Total Volume: 447.4 ft3
Displacement:
Drill Pipe: 0.00742 bbl/ft x 10,100 ft = 74.9 bbls
Liner: 0.0137 bbl/ft x 4220 ft = 57.8 bbls
Total Displacement = 132.7 bbls
Max. overdisplacement = (80 x 0.0137) / 2 = 0.55 bbls
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Conclusion
Liners have many applications
The main feature is that normally you have small volumes of
slurry and high pressures during the job.
Liner overlap is the most critical part to cement correctly
Even though most of the times we are not at charge of the
hardware (liner hanger, cement head, etc.), we must have
knowledge of what has been run in the hole, and the way it
works.
It is important to slow down the displacement to avoid
excessive pressures (shear pins, end of displacement)