Restoring Annular Barrier in a Horizontal Well · Restoring Annular Barrier in a Horizontal Well...
Transcript of Restoring Annular Barrier in a Horizontal Well · Restoring Annular Barrier in a Horizontal Well...
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Restoring Annular Barrier in a Horizontal WellGrant Stephen – Chevron Drilling Engineer
© 2017 Chevron North Sea Limited | Company Confidential
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2© 2017 Chevron North Sea Limited | Company Confidential
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1 2 3PRESENTATION AGENDA
OVERVIEW OF WELL CHALLENGES FACING
SUCCESS OF PWC
PWC OPERATIONS
RESULTS ACHIEVED QUESTIONS
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3© 2017 Chevron North Sea Limited | Company Confidential
Partial Pack off
Complete Pack off
13 3/8” Shoe 4917ft 4,110ft TVD70° inc.
Port Collar11,000ft5,100ft TVD76 ° inc.
10ft Perforated Interval15,319 – 15,329ft 5,743ft TVD84 ° inc
Float Collar19,150ft6,415ft TVD
Float Shoe19,503ft6,453ft TVD88 ° inc.
WELL STATUS
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WELL STATUS
Identification of 10ft perforating interval
- Liquid filled annulus- Adequate standoff- High confidence of circulation path from shoe to perforations
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PERF-WASH-CEMENT CHALLENGES
• Identification of 10ft perforating interval
∆ Constrained to perforate at the existing perforated interval
• Liquid filled annulus over logged interval
∆ No annular base to provide cement support once spotted
• Adequate standoff
∆ 84° inclination, high risk of cement slumping and exposing
perforations/formation
• High confidence of circulation path from shoe to perforations
∆ Challenging environment to achieve 100% zonal isolation
and reinstate casing integrity with PWC
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HYDRAHEMERA™ OPERATIONS
Perforated 126ft of 9 5/8” casing with 7” 18spf
guns.
Washed perforated interval with 11.8ppg OBM
at 0.5ft/min, 345gpm, 6rpm (loss free rate).
Passed over interval down then up.
RIH below bottom perf and wash with 11.8ppg
spacer at 250gpm, 6rpm.
Opened cement valve with a ball drop,
conducted cementing operations with
105gpm, 80rpm whilst pulling out of hole at
6ft/min. (350% of perforated interval, 800ft)
Volume control is critical throughout operation.
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HYDRAHEMERA™ OPERATIONS
• Tagged TOC 100ft above perfs
- 65% of cement volume was
contaminated.
• Drilled out internal cement, observed
dynamic losses when the top perforation
was exposed
• Performed cement squeeze to achieve
zonal isolation – 1.9bbl squeezed away
• Drilled out internal cement with no losses
and successfully pressure tested
• Logged cemented interval
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RESULTS ACHIEVED
Calibrate Logging Results
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RESULTS ACHIEVED
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RESULTS ACHIEVED
All operations conducted at +/- 15,400 ft (+/- 20hr round trip)
• Install FasDrill bridge plug
• Perforate casing
• Wash and cement
• Drill out cement
• Perform remedial squeeze
• Drill out cement and pressure test
• Perform cement evaluation log
Total operational time: 14 days (5 days tripping)
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