A new well was accidentally drilled into an existing gas production well at a depth of 611m.
The accident triggered an underground blow-out in which large quantities of gas were produced from a 3536m deep reservoir into the 611m formation. The drilling rig was severely damaged by the blow-out and the newly drilled hole finally collapsed. The blow-out caused also a continuous gas flow from the 611m formation to surface at various locations. All attempts to kill the production well by bull heading kill fluid trough the damaged 5,5” production tubing failed.
The objective was to rig-up a Snubbing unit on top of the X-mass tree of the existing gas production well and install a 2-3/8” kill string into the damaged 5,5” completion and to use the kill string to dynamically kill the well by circulating kill weight mud.