PLUG FOR USE IN WELLBORE OPERATIONS AND APPARATUS FOR LAUNCHING SAID PLUG

摘要

An apparatus for launching at least two plugs, said apparatus comprising a mandrel (2), a lower plug (22) and an upper plug (21) releasably disposed with respect to said mandrel (2), wherein said upper plug (21) comprises a body (23) having a flow path (24) therethrough and a cap (25) for blocking fluid flow through said flow path (24) characterised in that said cap (25) is detachable from said body (23) in use if the upper plug (21) is prematurely ejected.