Method and apparatus for making a pig in a vertical riser pipe

Details Method and apparatus for making a pig in a vertical riser pipe Method and apparatus for making a pig in a vertical riser pipe

B - Operations, Transporting

08

B

B08B 9/02 (2006.01) B08B 9/04 (2006.01) B29C 39/10 (2006.01) E21B 17/01 (2006.01) E21B 23/10 (2006.01) E21B 33/076 (2006.01) F16L 55/40 (2006.01) F16L 55/46 (2006.01)

Patent

CA 2225570

A tension leg platform in deep water over an underwater wellhead system supports an upstanding pig riser. The riser ID is smaller than the shoreline ID delivering produced oil to shore. The shoreline is pigged by a tapered nose pig inserted into the bell nipple at the top, open end to enable pig passage down the riser compressing the pig body. The body is formed of N discs and N foam donut spacers to clean the shoreline ID. The pig body has an elongate center post and integral, parallel discs to wipe the pipeline clean.

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