Gate-Valve Milling Operation Performed With Coiled Tubing

摘要

Brunei Shell Petroleum offshore Well A was shut in because the SVs-in.master valve on the 5,000-psi monoblock tree was stuck in the closed position because of scale.Two options were considered for recovering the well with well intervention techniques rather than a complete workover and well-kill operation.Because the nearest gate-valve milling machine was in Europe,the valve was milled by use of a coiled-tubing(CT)unit that was on the platform performing a stimulation program on adjoining wells.This operation had been performed only once before,in the North Sea.