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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: ft 864 ft 3003 ft 10¾” x 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” 18,020 ft 5½” 1698 ft 7” 1584 ft PBR 15,367 ft 4.125” 16,078 ft 2.847” SXAR Gun 16,211 ft Top of Perf 16,865 ft Perforations: 16, ,360 ft 16, ,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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