ConocoPhillips
WELL COLLAPSE RECONNECT SYSTEM

Abstract:

The invention relates to a method and apparatus for remediating damaged casing or liner in a hydrocarbon well, e.g. caused by collapsed formation. Damaged liner is milled away and a straddle joint (20) located in the exposed ends of liner (8,9), bridging the gap between them and restoring most of the inner diameter. The straddle joint (20) includes cement ports (25) through which cement may be injected into any cavity (4) in the rock surrounding the straddle joint (20), thereby supporting the rock and helping to prevent further collapse.