1. Running of Liner with Buoyancy Assisted Method and Rotating type Centralizer in Deep-Water ERD Well

2. Content Introduction Salient Points Offset well Analysis
Pre-Job Planning
Floatation Execution
Summary

3. Introduction
The well is a W/Over and Re-Entry well in eastern coast of India with WD ~ 1200m.
Brief SOW for the well
De-completion and isolation of existing LC and MB
ST from the existing 13-5/8” casing
Drill 12 ¼” hole and set 9-5/8” production liner
Drill 8 ½” production hole
Carry-out LC & UC

4. Salient Points Well was ST from 13-5/8” casing
12-1/4” section length ~ 2600m from 2500m to 5100m MDRT
Build from 14˚ to 89˚in 700m
Hold for 1300m at Inc. 89˚
Drop 89˚ to 66˚ in 500m
9-5/8” x 9-7/8” liner length: 2600m MDRT
Combination of 9-7/8” & 9-5/8” casing

5. Well Schematic Riser Seabed ~1200m 13-5/8” Casing 12-1/4” Open Hole
ST~ 2500m
12-1/4” TD: 5100m MDRT
9-5/8” Liner

6. Pre-Job Planning of 9-5/8” Liner

7. Basis of Design Offset well data
Liner length~ 2500m
WD and well TD almost same
Liner was run with conventional method
OH ff of ~ 0.6 was observed after 4000m MDRT
So, it was decided to have a design OH friction factor of 0.6 for the planned well.

8. Conventional Method SIMS showed that liner can't be run till TD
Helical buckling lockup after ~4000m for OH ff of 0.6
For a ff of 0.5, liner still not able to go beyond ~4400m MDRT.
Thus running of liner by conventional method wasn’t feasible.

9. Conventional Method & Rotation
Liner can be run till TD by
Rotation at rpm
Surface torque required is > casing connection and top drive limits
~ 100 k ft. lbs. for 0.6 ff
~ 90 k ft. lbs. for 0.5 ff
Thus running of liner by this method also not feasible.

10. Floatation Floatation assisted method
Liner is run empty with mud in the annulus
It is possible to run the liner till TD
Concerns of helical buckling after 4000m MDRT for OH ff > 0.6

11. Floatation and Rotation
Liner can be easily run till TD by
Rotation at RPM.
Surface torque is in range of ~ 40 k ft.lbs for OH ff of 0.6.

12. Design Conclusion Decided to run the liner using floatation method
With the capacity to rotate, if required
Liner might need to be rotated in the last 1000m beyond 4000m MDRT.
Surge analysis: running speed of liner was restricted to 1-3m /min to avoid losses
~20 hours of rotation of 2600m long liner string at RPM.
Robust design of rotating type centralizer is required

13. Centralizer Plan
Various types of specialized centralizers were evaluated
Roller centralizer
Centralizer sub
Protech Centralizers
Halliburton Protech centralizer was finalized
Directly installed onto the surface of casing and becomes an integral part of casing itself.
Top of cement was planned 1000m above the liner shoe.
Thus, 1 centralizer per jt. was planned Up to 1000m from bottom for good cementing.
Roller centralizer
Centralizer sub
Protech

14. Protech Centralizer

15. Modifications Casing Connection Liner R/tool
Complete system of R/Tool, Liner Hanger and casing was designed for torque of > 65 Klb. Ft
Casing Connection
Inventory had Vam top connection with torque rating of only 25 klb. Ft
VT couplings were cut from the existing casings and made up with Vam 21 couplings, which meets the requirement.
Liner R/tool
Primary release was hydraulic
To avoid accidental release of R/tool during RIH,
the required compression was increase from 15 Kips to 50 Kips
torque pins rating increased from 6 Klb. Ft to 20 Klb. Ft

16. Modifications Float Equipment
New float eq. With 7500 diff. Pressure rating were purchased
Tested under 6000 psi pressure for 36 hrs. To ensure their integrity.

17. Floatation Execution Initial 120m of liner was filled with 11 ppg mud
To have enough weight against heave motion ~ 30 Kips.
Rest of 2465m of liner was run empty along with the R/Tool.
Shoe Track
Reamer shoe with singe float valve
Two float collar with double valves
Liner was run successfully till TD with minor held-up at 4400m MDRT.
Liner was reamed down at 20 RPM.
No issues

18. Floatation Execution
Once at TD, the liner was lubricated with 11 ppg mud using SES 3-4 bpm.
Total time taken was ~ 5-6 hrs.
Liner hanger was set and cemented as per plan.

19. Special Technology Used
Liner Floatation
High Torque Casing Connection
Rotating Type Centralizers
High Differential Rating Float Eq.

20. Summary
9-5/8” liner was successfully run till well TD using floatation method.
Liner was successfully rotated beyond 4000m 20 RPM.
CBL-VDL log post cementation showed good quality of cement behind 9-5/8” liner.

21. Thank You