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- W137649027 abstract "Abnormally high pressure, sour, carbonate Devonian reefs have caused drilling and completion difficulties since the West Pembina, Alberta, Field was was discovered in 1977. This work deals with the practical aspects of the kill operations under sour gas conditions. These sealed devonian Nisku Reefs vary in pore pressure from normal gradients to in excess of 1900 kg/cu m. The depth of burial ranges between 2500 to 4000 m, and each reef exhibits different degrees from sweet to 42% H/sub 2/S. Reef penetration is hazardous due to unpredictable pore pressure, sour gas, low fracture gradients above the reef, and apparent lack of drilling indicators of impending over pressure in the carbonate transition zone above the reefs. Low fracture gradients in Cretaceous, Mississippian, and upper Devonian sections dictate that casing be landed immediately above the over-pressured reef. During the exploration period of West Pembina, the Canadian Drilling Industry was converting to metric. A case history of a high pressure drill in operation is presented in metric. Other practical procedures are described as they relate to over-pressured sour gas operations." @default.
- W137649027 created "2016-06-24" @default.
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- W137649027 date "1981-04-20" @default.
- W137649027 modified "2023-09-23" @default.
- W137649027 title "Pembina's high-pressure sour reefs need special drill in procedures" @default.
- W137649027 hasPublicationYear "1981" @default.
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