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Health and Safety Executive Well Integrity – The UK Experience Donald Dobson Head of Well Engineering & Operations.

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Presentation on theme: "Health and Safety Executive Well Integrity – The UK Experience Donald Dobson Head of Well Engineering & Operations."— Presentation transcript:

1 Health and Safety Executive Well Integrity – The UK Experience Donald Dobson Head of Well Engineering & Operations

2 UK Regulations on Wells Offshore Installations and Wells (Design & Construction, etc.) Regulations 1996 –Regulation 13 - General Duty –Regulation 16 – Materials –Regulation 17 – Well Control –Regulation 18 – Arrangements for examination

3 DCR regulation 13 Well designed, constructed etc. - so that there can be no unplanned escape of fluids from the well. Applies throughout life from design to abandon

4 DCR Regulation 18 Duty on well-operator to put arrangements into effect –For examination by independent & competent person To ensure well is designed, constructed and maintained such that –There can be no unplanned escape of fluids from the well

5 Definition of Well Defined in terms of pressure envelope Includes BOP and / or Xmas tree

6 Piper Alpha

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9 Ocean Odyssey

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12 Shearwater

13 SW-05 Well Sketch X-over at 2956 ft MSL to DFE: 142.7 ft 30” @ 864 ft 20” @ 3003 ft 10¾” x 9-7/8” @ 15,908 ft 14” x 13 3 / 8 ” @ 11,832 ft X-over at 8318 ft Seabed: 434 ft X-over at 16,236 ft 7” x 5” Liner @ 18,020 ft 5½” TRSSSV @ 1698 ft 7” QP @ 1584 ft PBR Top/Locator @ 15,367 ft 4.125” LN @ 16,078 ft 2.847” SXAR Gun Release @ 16,211 ft Top of Perf Guns @ 16,865 ft Perforations: 16,262 -- 16,360 ft 16,470 -- 17,000 ft Pentland A BHP = 15,100 psi Pentland C BHP = 12,800 psi Hod Gas

14 Shearwater Tree / Tubing Hanger

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18 North Cormorant Wellhead slumped 0.5m 20” & 13-3/8” casing failed due to corrosion of 13-3/8” Well supported on 9-5/8” Production tubing helically buckled at 1555m


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