MFIV-II Isolation Valve | Mechanical Barrier Valve | Schlumberger

MFIV-II

Mechanically controlled isolation valve

Rated to 11,000 psi [76 MPa]
Rated to 335 degF [168 degC]
Validated to ISO 28781 and API Spec 19V V3 and Q1

Prevent formation damage with a versatile, bidirectional barrier valve

The MFIV-II mechanically controlled isolation valve serves as a bidirectional barrier to isolate reservoir fluids in the lower completion.

  • Enhance well productivity by preventing formation damage and minimizing fluid loss
  • Save rig time and costs by eliminating the need to kill the well for various operations
  • Increase safety by providing a downhole barrier against pressure reversals
MFIV-II mechanically controlled isolation valve

Open and close multiple times

The valve also provides a two-way barrier during remedial work (e.g., removal and reinstallation of an ESP or the production tubing), underbalanced perforating, and general completion operations.

Operated mechanically with a shifting tool run on the end of washpipe, a perforating string, or CT, the MFIV-II valve can be opened and closed multiple times. It uses the same ball sealing design and latch collet system used in the FIV-II formation isolation valve.

Rely on stringent qualification and testing

The MFIV-II valve is qualified with gas to a zero-bubble leak rate across the ball from below under specified conditions. This stringent acceptance criterion enables the tool to be used as a barrier before production starts; subsequently the valve can be used as a fluid loss control device for well intervention operations, well suspension, and temporary abandonment.

MFIV-II mechanically controlled isolation valve
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