Casing Recovery

Pre-Job Meeting

Make up casing spear assembly and rack back

Make up casing cutting assembly

RIH with cutting assembly to calculated free point

Make first cut, flow check.

POOH & lay down cutting assembly

RIH with spear/pack-off & engage same

Confirm casing is free

Displace mud from behind 9 5/8" casing - collect returns

Pull 9 5/8" hanger free and Flow check

Pull 9 5/8" hanger/casing to surface

Release & rack spear

Rig up to handle 9 5/8" casing

Pull & lay down 9 5/8" casing

Rig down casing handling equipment

M/u work stand and rack back

M/U and RIH with milling BHA. Break circ every 20stds

Circ hole to hi-vis bentonite mud and condition same

M/U and RIH with milling BHA. Break circ every 20stds

Mill casing to 9750'

Pull back 1 stand and m / u work stand

Work jetting sub and magnets through BOP and wellhead

Press Test 13 3/8" casing to 3000psi

Displace hole to 11.5ppg salt saturated mud

POOH Milling Assy

RIH for clean up trip (junk mill), dress stump, circ

Dress off 9 5/8" stump, circ clean and condition mud

POOH clean up BHA

RIH with milling BHA. Break circ every 20stds

Mill casing to 10,154'

Circ clean, drop carbide and rice bombs

POOH Milling Assy

1. 43/22-2 Suspension Schematic

E70 RTE 0

MSL 152.0

Water Depth 188.0

Seabed ### Seabed

Top Cmt Plug 3 @ 2060' MDBRTBase Plug @ 2534' MDBRT

Perforations: Bridge plug @ 12214' MDBRT15,412' - 15,542' Top Cmt Plug 2 @ 12322' MDBRT15,592' - 15,662' Base Plug @ 12844' MDBRT15,682' - 15,782'16,032' - 16,062'

Top Cmt Plug 1 @ 14823' MDBRTBridge Plug @ 15321' MDBRT

9-5/8" MLH13-3/8" MLH

20" MLHTop 30"

13-3/8" @ 9854' MDBRT

9-5/8" @ 14694' MDBRT

TD @ 17314' MDBRT

CASING DETAILS

30", 1/1.5" Wall, X56, RL4 20", 129 lb/ft, X56, RL4S 13-3/8", 72 lb/ft, P110/N80, BTC 9-5/8", 53.5 lb/ft, ST95, New Vam 7", 29 lb/ft, L80, New Vam

30" Driven

13-3/8" TOC @ 2541' MDBRT

9-5/8" TOC @ 9354' MDBRT

7" TOC @ 12394' @ T.O.L.

Plu 2

20" @ 3802' MDBRT

Plu

Plug 3

30" @ 752' MDBRT 20" TOC @ 1477' MDBRT

7" @ 16672' MDBRT

9.7ppg

NaCl

9.7ppg FilteredInhibited

NaCl Brine

733' TCP Guns & 38' Wireline LINC Tool LIHTop Guns 15855' MDBMSL. Top LINC tool 15817' if not alongside guns.

7" L/Collar at 16588' MDBRT

Objectives• Re-enter suspended 43/22-2 well bore to tag and

cleanout cement suspension plug #3 at approx. 2,060ft MDBRT and check the 9-5/8” casing for deformation down to bridge plug set at 12,214ft MDBRT.

• Cut and recover the un-cemented portion of the existing 9-5/8” casing string down to theoretical TOC at 9,354ft MDBRT, as confirmed by USIT logs.

• Mill the cemented 9-5/8” casing to 10,150ft MDBRT to create a 300ft window below the existing 13-3/8” casing shoe.

• Confirm the integrity of the existing 13-3/8” casing by pressure testing to 3,000 psi.

• Set a cement kick-off plug for the well to be sidetracked from just below the 13 3/8” casing shoe at 9,854ft.MDBRT

Hazard Solution/Comment

Possible trapped pressure below suspension plugs.

Tested BOPs and well control procedures in place.

Handling recovered joints of casing coated with rust and cement debris.

Thorough risk assessment of casing recovery process. Risk Assessment will include required PPE, identify and address any dropped object hazards.

Difficulty handling and clearing steel swarf from circulating system at surface.

Use of Brandt Swarf Recovery System to minimise physical intervention during milling operations. Implement extensive lessons learned from 43/22a-K1 slot recovery operations.

Spontaneous swarf combustion

Swarf to be washed down and immediately cooled prior to shipping back to shore.

OBM behind 9 5/8” casing

Old OBM to circulated out, isolated and shipped back to shore for disposal.

• Prepare the Swarf Buster extension for installation;• Set up a bunded area on main deck where full swarf skips can

be washed down with seawater and effluent pumped back to the circulating system using a Wilden pump;

• Brandt unit has been overhauled and set up as per recorded ‘cat flap’ settings from –K1.

• Both Brandt centrifugals will have been manifolded together and tied in to system to enable quick change over for impeller cleaning or maintenance;

• Brandt to provide 100% extra field replaceable parts and spares in anticipation of a lengthy milling job;

• Ditch magnets will be positioned as follows: 3 sets of EZ-clean magnets will be positioned along the flat bottomed trough in the pit room prior to the mud returning to Pit #1. (Use as active for swarf recovery); 2 sets of Ez-clean plus 2 Stacey ditch magnets to be positioned in the flat bottomed ditch behind the shakers; 1 set of Ez-clean to be positioned in the bevelled ditch on the cantilever; 2 Stacey ditch magnets to be positioned in the flat bottomed shaker ditch system.

• Mobilise 6 off 1013/16” Barracudas from Smith Red Baron. Also have Weatherford 10 7/8” quickcut cutter on standby.

• Use mill run #6 parameters (from milling runs in the K1 well).

• Source alternative PPE for the job – gloves, slicker suits.

• 4 x mud vacs; 1x on rig floor, shakers, main deck, pump room.

• Casing test before milling out of shoe. (Displace gel mud to Salt Saturated polymer).

• Isolate trip tank and drains around rotary table.• Prehydrate gel cased hole milling fluid and treat to

achieve 6OYP. (for openhole milling a salt-saturated polymer mud shall be used at 60 YP. Install shearing device in pits. (Use 3rd mud pump.)

• Boost BOPs through choke & kill lines 1500 GPM for 5 minutes each ½ stand. N.B. Clear BHA first!! (where possible use 3rd mud pump while milling ahead)

• Use standpipe bleed-off line and third mud pump to jet through flowline.

• Plan for a maximum 300’ window below 13⅜” casing shoe.

• Stall torque limit for Barracuda @ 18K ft – lbs. Increase m/u torque in taper mill sub assembly below.

• Recommendation for setting down WOB quickly (minimise ‘feathering’ to minimise type 1 swarf generation). Address in Work Instruction.

Swarf type 1 is that produced on the first two milling runs using the following approximate parameters – 2-10k WOB, 160-190 RPM. This is effectively low WOB, high RPM.

Swarf type 2 was that initially produced on milling run #3 using 15k WOB and 125 RPM, i.e. high WOB and low RPM (relatively).

Swarf type 3 was then produced on milling run #3 using 20k and 125 RPM, i.e. higher WOB still and the same lower RPM.

Type 1 is obviously very prone to birds-nesting and has consistently caused problems since the milling operation began. It is not the type of steel cutting we wish to produce, but is often associated with the harder steel (P110) we have here. Its production can also be exacerbated when milling with a motor as it’s a by-product of higher RPMs. The lower grade casings (L80) are not likely to produce this. In addition, this fine “wool” is perfect for blinding off the shakers pretty much regardless of what size mesh they are dressed with and, of course, acts like Velcro to other swarf.

Type 2 is a far better thickness, therefore stronger and less “pliable” and far less likely to birds-nest. However, it is very long to handle effectively and pass through the tighter areas of the surface system without having a tendency to dam itself, i.e. at the flowline entrance tonight (17-18/11/05). It will, however, fall out far easier over any screens, be they in the Brandt unit or over the shakers. These are up to 2ft long and ½” wide.

Type 3 is the ideal “cutting”. It very much resembles well-preserved PDC shale cuttings averaging 2” in length, yet still ½” thick. It will not dam up in the more restricted areas of the surface system and will be easily stripped out over either the screens of the Brandt unit or over the shakers. It’s a no-brainer that we need to be producing and handling this type of swarf.

Mills run:

Junk Mill S/N Taper Mill S/N Casing Mill S/N Footage Hrs

Av ROP

BHA 28 - - RB A14289 RB J30479 276 47.5 5.81

BHA 29 RB 22637 - - - - - - -

BHA 30 - - RB A14289 RB J80473 422 58 7.28

BHA 31 - - - - - - - - -

BHA 32 - - - A14289 RB J80272 340 32.5 10.46

BHA 33 RB 22637 RB - - - - - -

BHA 34 - - RB J28014 Baker U1110015 392 82 4.78

BHA 35 RB 22637 - - - - - - -

BHA 36 - - RB J28014 RB RB25242 419 20.38 20.56

BHA 37 - - RB J28014 RB J11613 200 12.81 15.61