Removing 36 hours from a workover Optimising rig time using LWIV & eRED technology

Presented by: Andy Skinner

Date: 9th March 2011

Slide 1

LWIV – up front work in advance of drilling rig

1. Conventional subsea vertical dual-bore tree

2. Install deep barrier, cut tubing and circulate to kill fluid

3. Set shallow barrier in hanger – annular string

4. Set shallow barrier c/w eRED in hanger – tubing string

5. eRED? – Electronic Remote Equalisation Device: ball type downhole barrier, remotely opened and closed up to 50 times over 6-9 months.

6. Remove tree – install debris cap

7. Return to base – tree sent for refurbishment

Workover or well abandonment

Slide 2

Drilling rig – when available move on site & pull completion

1. Remove debris cap – install BOP’s

2. Latch tubing hanger on drill pipe: no need for dual bore riser to remove hanger barriers

3. Apply pressure command to open eRED

4. Tubing & annulus now equalised

5. Close BOP rams onto drill pipe – unseat hanger

6. Vent gas cap & circulate top hole clean

7. Open BOP rams – pull completion

Workover or well abandonment

Slide 3

Value highlights LWIV & eRED

1. Reduction in intervention and exposure to weather: PCE rig up/down and pulling operations (10 hours )

2. Remote equalisation – no intervention once eRED has opened

3. No wireline – no need to run Dual Bore Riser: riser deployment/test ( 26 hours )

4. Completion pulled on drill pipe

5. Rig time savings in excess of 36 hours have been achieved

Workover or well abandonment

Slide 4

What’s next? If new completion is being installed

1. Drilling rig installs and tests new completion

2. Shallow & deep barriers run as part of completion – tubing mounted full bore eRED

3. Install debris cap – drilling rig moves on to next well

4. LWI moves to well site within 9 -12 months

5. Remove debris cap – install tree and test

6. Apply pressure commands to remotely open shallow & deep barriers

7. Well brought on stream with no slickline intervention

Questions?

Completion deployment

Slide 5