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• W2089672865 abstract "Medley, Edward L., Amoco (UK) Exploration Company Abstract There are 92 surface operated, wireline retrievable sub-surface safety valves installed in Amoco (UK) Exploration Company's portions of the Leman, Indefatigable and portions of the Leman, Indefatigable and Rough Fields. These valves are fail-safe in operation and offer a back-up shut-in safety system to all other safety shutdown devices on a platform. Therefore, each valve is function tested monthly. There are three types of valves in use in these fields, the bypass type, the ball type and the flapper type. Records covering an eight year period were reviewed to provide data to determine a failure rate provide data to determine a failure rate for each type of valve. Individual graphs were prepared showing each time a valve was pulled, and these were reviewed and summaries given to show how failure rates were determined. Based on the review, the following failure rates were determined: Type No. of No. of Failure Valve Tests Failures Rate Bypass 3472 28 0.8% Ball(old 595 68 11.4%type) (new 172 4 2.3%type) Flapper 1651 26 1.5% Introduction Amoco has been producing gas from the southern North Sea since April 1969 and until July 1977, 101 development wells had been completed in the Leman, Indefatigable and Rough Fields. The fields produce from the Rotliegendes Sandstone from depths ranging from 6600' to 8500'. In these fields two completion schemes are used, one with 4 1/2 tubing, the other with 5 1/2 tubing. The 4 1/2 tubing was used in 36 wells on the first three platforms in the Leman Field, but all later completions used 5 1/2 tubing. As part of the completion equipment, a surface operated, wireline retrievable, subsurface safety valve is set in the tubing, approximately 100' below the sea bed. These valves are referred to as mudline safety valves (MLSV). These are fail safe, since hydraulic pressure from the surface must be maintained to keep them open. A concentric tubing/casing annulus is used to transmit this hydraulic control pressure. Due to the type of operation and the location of these valves, they provide a back-up to all other safety shut-in devices on a platform. They will automatically close if any of the surface hydraulic control equipment is damaged, or if the Christmas tree is damaged, and due to their location within the well, they should be immune from any damage above the sea bed. Each MMSV is function tested once per month. This test is conducted in the following manner:With the well flowing, the hydraulic annulus pressure is bled off, causing the MLSV to close. P. 257" @default.
• W2089672865 created "2016-06-24" @default.
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• W2089672865 date "1978-10-24" @default.
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• W2089672865 title "Experience With Surface Controlled Sub-Surface Safety Valves" @default.
• W2089672865 doi "https://doi.org/10.2118/8068-ms" @default.
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