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Piper oilfield
The Piper oilfield is a substantial North Sea oilfield covering 30.1 km2. It lies roughly half way between Aberdeen and Bergen, at the eastern end of the Moray Firth basin".〔Maher, C.E., Piper Oil Field, in Giant Oil and Gas Fields of the Decade:1968-1978, AAPG Memoir 30, Halbouty, M.T., editor, Tulsa:American Association of Petroleum Geologists, ISBN 0891813063, pp. 131-133〕 Oil extracted from it is piped to Scotland, where it is refined at a refinery on the island of Flotta, in the Orkney Islands, while gas is shipped via the Frigg gas pipeline.〔Maher, C.E., Piper Oil Field, in Giant Oil and Gas Fields of the Decade:1968-1978, AAPG Memoir 30, Halbouty, M.T., editor, Tulsa:American Association of Petroleum Geologists, ISBN 0891813063, p. 133〕 In June 1975, the ''Piper Alpha'' oil platform was placed over the field in 144 m of water, secured in place by 24 piles extending 116 m beneath the seabed. The platform was designed for simultaneous drilling and production.〔Maher, C.E., Piper Oil Field, in Giant Oil and Gas Fields of the Decade:1968-1978, AAPG Memoir 30, Halbouty, M.T., editor, Tulsa:American Association of Petroleum Geologists, ISBN 0891813063, p. 133〕 Piper Alpha was the site of one of the world's worst oil platform disasters when it was destroyed by an explosion in 1988, with the loss of 167 lives. Piper Bravo was installed in 1992.〔(Talisman Energy information about Piper Bravo )〕 Talisman Energy acquired a controlling interest in 2000.〔(Talisman Energy February 9, 2000 Announcement )〕
Occidental Petroleum Corp., Getty Oil (Britain) Ltd., Thomson North Sea Ltd., and Allied Chemical (North Sea) Ltd.,〔Maher, C.E., Piper Oil Field, in Giant Oil and Gas Fields of the Decade:1968-1978, AAPG Memoir 30, Halbouty, M.T., editor, Tulsa:American Association of Petroleum Geologists, ISBN 0891813063, p. 133〕 that later transformed into the OPCAL joint venture, obtained an oil exploration licence in 1972 and discovered the Piper oilfield in early 1973 after seismically mapping the area.〔Maher, C.E., Piper Oil Field, in Giant Oil and Gas Fields of the Decade:1968-1978, AAPG Memoir 30, Halbouty, M.T., editor, Tulsa:American Association of Petroleum Geologists, ISBN 0891813063, p. 133〕 Oil production started in 1976 with about increasing to . A gas recovery module was installed by 1980. Production declined to by 1988. OPCAL built the Flotta oil terminal in the Orkney Islands to receive and process oil from the Piper, Claymore and Tartan fields, each with its own platform. A diameter main oil pipeline run from ''Piper Alpha'' to Flotta, with a short oil pipeline from the Claymore platform joining it some to the west. The Tartan field also fed oil to Claymore and then onto the main line to Flotta.〔(pipeline dimensions )〕 Separate 46 cm diameter gas pipelines run from Piper to the Tartan platform, and from Piper to the gas compressing platform MCP-01 some to the northwest.
==Geology==
The field consists of three folded, tilted blocks on the northern edge of the Witch Ground Graben.〔Maher, C.E., Piper Oil Field, in Giant Oil and Gas Fields of the Decade:1968-1978, AAPG Memoir 30, Halbouty, M.T., editor, Tulsa:American Association of Petroleum Geologists, ISBN 0891813063, p. 131〕 Production is from the Upper Jurassic Piper Sandstone, a sandstone shelf with a thickness up to 142 m and Oil-water contact ranging in depths from 2195 to 2804 m under the sea.〔Maher, C.E., Piper Oil Field, in Giant Oil and Gas Fields of the Decade:1968-1978, AAPG Memoir 30, Halbouty, M.T., editor, Tulsa:American Association of Petroleum Geologists, ISBN 0891813063, p. 131〕 Piper oil most likely originated in the Kimmeridge Shale.〔Maher, C.E., Piper Oil Field, in Giant Oil and Gas Fields of the Decade:1968-1978, AAPG Memoir 30, Halbouty, M.T., editor, Tulsa:American Association of Petroleum Geologists, ISBN 0891813063, p. 159〕
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