"Every well needs one"SPE Aberdeen 4th European Well Abandonment Seminar

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Version 2.0

Ole Petter Nipen – Baker Hughes

Agenda

� Introduction to TOGI Subsea P&A project

�Scope of work

�P&A operation Step by Step

�Big Fishing �Big Fishing

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TOGI P&A Project

� 6 slot wellhead structure,

5 wells drilled in 1990

� All ROV operated

� 300 m water depth

� Closed in down since 2002

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Scope of work

Batch P&A of 5 wells:

� Pull completion

� Log 9 5/8” casing

� Place 1st barrier

� Cut & Pull 9 5/8” Casing

� Place 2nd barrier

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� Cut & Pull 13 3/8” casing

� Surface plug

� Remove wellhead, 30” and

42” casing

Contingency:

� Mill seal assembly

� Section mill 9 5/8” & 13 3/8”

� Casing mill 9 5/8”

� Cut & Pull 9 5/8” in one run

Pull Completion

Operational steps

� Pull tubing with THRT

� Tubing pulled down to PBR

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9 5/8” X 10 ¾” section

� Log 9 5/8” X 10 ¾” Casing

� Place 1st Barrier Plug

� Cut 10 ¾” Casing Below Hanger

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� Pull 10 ¾” Seal Assembly

� Remove 10 ¾” X 9 5/8” Casing

Remove 10 ¾” seal assembly

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Remove 10 ¾” seal assembly

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10 ¾” Seal Assembly and casing hanger

Mill 7 Seal Assembly

Remove 10 ¾” x 9 5/8” casing

� Cut & Pull in same run

� Cut in tension

� Pull up to max overpull prior to cut

� Pre-defined section cutted

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� Saved eight run

Casing Mill

� Mill 58 meter of 9 5/8” Casing

� ROP was limited by swarf handling

� Small swarf

Define max ROP upfront!

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Define max ROP upfront!

55

Contingency

� Contingency on all wells

� 9 5/8” & 13 3/8”

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13 3/8” section

� Log 13 3/8” Casing

� Place 2nd Barrier Plug

� Pull 13 3/8” Seal Assembly

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� Remove 13 3/8” Casing

18 5/8” section

� Set 18 5/8” Mechanical Plug

� Place Surface Cement Plug

� Cut & Pull 18 5/8”

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� Cut & Pull 30”

� Cut & Pull 42”

Big Fishing

1. Remove 18 5/8” wellhead (Blue)

2. Remove 30” Conductor (Red)

3. Remove 42” Washout sleeve (Green)

Shear at 136 ton

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Cut & Pull 18 5/8” Wellhead

D-spear

� Two Trip Solutions

� Dressed to catch ID:18,000"-19,162"

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D-spear Wellhead

Cut 30”

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Pull 30” Conductor

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����

E-spear

20 ¾” D-spear

Cement?

� Cement above 42” hanger and inside template housing!

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45 ½” Cement MillCement outside of 30”

Cut 42”

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MS-Cutter with Stabilizer 42” Conductor cut

Pull 42”

Remove 42” Washout sleeve (green)

� Catch 38,5”

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Modified E-Spear

Stack-Up Test

42” Conductor on Deck

Big Fishing

Movie

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TOGI P&A Project – Sum up

Operational time: 1208.4 hrs

Downtime: 4.5 hrs

Operational factor: 99.62%

Mill 9 5/8” & 13 3/8” Seal Assembly: 7 seal assy milled

Cut operation of 9 5/8”, 10 ¾” & 13 3/8”: 16 run

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Cut operation of 9 5/8”, 10 ¾” & 13 3/8”: 16 run

Cut & pull operation with Spear, and motor: 8 run!

Pulling & Cutting operation: 25 run

9 5/8” casing milled: 58 meter

TOGI P&A Project – Sum up

� Robust fishing package offshore

� Standardise BHA`s

� Milling Seal Assembly

� Back-up equipment for Big Fishing Tools

� Personnelo Planning and follow up operation

o Operators offshore

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Operational factor: 99.62%

Questions?

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