Method and equipment for launching pigs into undersea pipes

摘要

PCT No. PCT/GB97/00721 Sec. 371 Date Mar. 18, 1999 Sec. 102(e) Date Mar. 18, 1999 PCT Filed Mar. 11, 1997 PCT Pub. No. WO97/39273 PCT Pub. Date Oct. 23, 1997This invention relates to a method and equipment whereby a pig (11) launched into a gas injection line (5) can be inserted into a hydrocarbon flow line (2) in a position close to the subsea wellhead or manifold (1) without interrupting the flow of hydrocarbons and with minimum interference to the process of gas injection.