Fremgangsmåte for midlertidig plugging, komplettering og overhaling av en brønn, og en brønn som innbefatter en dobbel barrieresammenstilling

摘要

In the method of the invention, reliance is placed on first and second barriers (26, 30) positioned in a well (10) to provide well control during completion. Each of the barriers is below the depth of the lowermost end of a completion string when that string is installed in the well (10). Both of the barriers can therefore remain in place during completion, thus obviating the need to use a BOP stack to supplement well control. This results in a considerable saving in drill rig time and thus significantly reduces the cost of contracting a well.