Q4000 completes first well operations jobNews // July 19, 2002
The project called for the final abandonment of a temporarily plugged exploration well, in approximately 500ft of water, requiring the installation of an intervention riser system, consisting of the Schlumberger SenTree 3 system, with 5in riser to surface for full well control. Having this intervention riser system allowed the surface cement plug to be drilled with coil tubing, for full vertical access to the depth needed for perforating the casing.
Wireline was rigged and run to depth with a perforating gun. The casing was perforated, allowing the suspected open annulus to be pressure tested for injectivity. On completion of this test, coil tubing was run to depth and a cement plug was set and tested across this zone, which did not require squeezing as there was no injectivity. This was followed by the replacement of the surface cement plug with coil tubing, and the recovery of the intervention riser system, allowing the wellhead to be removed, and final seabed clearance to be carried out with a Canyon Offshore work class remote operated vehicle permanently installed onboard.