Remotely operated valves eliminate requirement of costly interventions
To achieve its goals, Shell elected to pre-install the remotely operated Halliburton eRED® valve as a shallow barrier in the tubing hanger. This allowed Shell to have a secondary barrier in place without the requirement of an intervention before removing the blowout preventer (BOP) and installing the Christmas tree.
In total, the eRED valves were installed 11 times for 10 wells. The additional installation was due to one of the wells being completed and worked over at a later date.
On all 11 installations, the eRED valve was made up to a 3.9-inch QXT lock in the close position and set in the tubing hanger nipple profile onshore. The assembly was then pressure tested to confirm the integrity of the eRED valve, crossover, and lock. Upon a successful test, the eRED valve was remotely opened via a pressure command and the tubing hanger was mobilized to the rig.
At the rigsite, the tubing hanger was picked up and run in hole with the pre-installed eRED valve. With the eRED valve in the open position, it allowed fluid bypass while the tubing hanger was landed.
Once at depth, the tubing hanger was landed and locked in place. To confirm the correct space-out, a low-pressure tubing test of 250 psi was performed through the open eRED valve in the tubing hanger against the Halliburton FS2 fluid loss isolation barrier valve in the lower completion.
Following confirmation of correct space-out, the tubing pressure was increased to 600 psi and held for 10 minutes, initiating the closing sequence of the eRED valve. A 10-minute closing delay allowed the pressure to be bled off to zero prior to the eRED valve closing, thus preventing any pressure being trapped below the eRED valve.
The closed eRED valve was successfully pressure tested to 2,500 psi, giving Shell a secondary tested well barrier before removing the BOP and installing the Christmas tree – without the use of an intervention.
Upon completion of testing the Christmas tree, the tubing pressure was increased to 1,250 psi and held for 10 minutes, initiating the opening sequence of the eRED valve. A 10-minute opening delay allowed the pressure to be bled down to 200 psi prior to the eRED valve opening. A tubing pressure drop at the end of the 10-minute delay confirmed that the eRED valve was open and allowed slickline to recover the eRED assembly without the need for pressure-control equipment.
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