Method and design for protecting destructible plugs in a pipe section of a hydrocarbon production unit and their application

摘要

A method to protect a crushable plug in a pipe section for hydrocarbon production against falling objects is described, and it is characterised in that one or more layers of a thick, viscous liquid is arranged on the topside of the crushable plug, where the topside of the thick, viscous liquid is given a completely covering protective layer to cover and seal the liquid layer on top of the plug, and in particular, several layers of viscous liquid are placed on top of the plug and between each layer of viscous liquid a completely covering protective layer is arranged to protect the plug. Also described is a construction of a plug unit comprising a crushable plug. The invention can be used to protect test plug units fitted in a section of casing tubing to carry out pressure testing.