The Mirage disappearing plug is a plugging device designed to run as an integral part of the tubing. The plug can be used to set a hydraulic-set packer or to test the tubing string. It is activated by hydraulic pressure, thus eliminating the need to use wireline or coiled tubing to run and retrieve the plugging device. Once the plug is expended, the plug material dissolves and disintegrates, leaving a full tubing ID through the plug. A fill sub is run above the plug when tubing autofill is required.
Case Study
Autofill Sub
The Autofill Sub is run above the Mirage® or Anvil® plug when automatic filling of the tubing is required. The unique fill sub bladder design allows debris-laden annulus fluids to enter the tubing, while providing a reliable seal from the tubing side.
The tubing can be tested any number of times, provided the shear pressure of the lockout piston is not exceeded. Once the lockout pins shear, as a result of tubing pressure, the piston drives the ports in the isolation sleeve past the o-rings, locking the fill sub out of service. A simple interference fit retains the fill sub in the locked-out condition.
