Is an important procedure used to verify the integrity and operational reliability of a casing cutter tool before it’s run into the wellbore. A casing cutter is used to cut through casing or liner strings, often during plug and abandonment (P&A) operations or wellbore sidetracking.

Purpose of Pressure Testing
The primary goals of pressure testing a casing cutter are to:

1. Ensure sealing integrity of the tool under downhole conditions.
2. Confirm tool activation mechanisms work properly (especially if hydraulically activated).
3. Detect manufacturing or assembly defects before deployment.

Key Aspects of the Test

1. Test Pressure
   Typically, the casing cutter is tested to 1.1 to 1.5 times the maximum expected operating pressure.
   For example, if it’s rated for 3,000 psi, the test might be performed at 3,300–4,500 psi.
2. Hydraulic Activation Tools
   Many casing cutters use hydraulic pressure to extend blades.
   In such tools, the pressure test checks:
   Blade extension mechanism
   Seals and piston integrity
   No internal fluid leakage
3. Test Medium
   Water or drilling fluid is commonly used as the test medium, sometimes with a pressure gauge to monitor pressure drop.
4. Test Duration
   Pressure is typically held for a specified period (e.g., 10–15 minutes) to observe for any pressure drop or leaks.

Casing Cutter Pressure Test Procedure (Simplified)

1. Assemble and visually inspect the casing cutter.
2. Connect to a hydraulic test pump.
3. Slowly apply pressure to the designated test value.
4. Hold pressure and monitor for leaks or pressure drops.
5. Confirm full functionality (blade deployment if applicable).
6. Bleed pressure and document results.

Failure Indicators
Pressure drops during the hold period
Leaks at seals or tool connections
Failure of blades to deploy under rated pressure