What is the purpose of performing a well integrity test (WIT) on a suspended well?

The purpose of performing a Well Integrity Test (WIT) on a suspended well is to verify the continued integrity of the well's pressure containment barriers and to ensure that the well remains safely isolated from the environment during the suspension period. A suspended well is a well that is temporarily taken out of production or drilling operations but is intended to be re-entered at a later date. During the suspension period, the well must be securely isolated to prevent the uncontrolled release of hydrocarbons or other fluids. The WIT is a series of tests designed to assess the condition of the well's barriers, including the casing, cement, wellhead, and any plugs or packers that have been installed. The WIT typically involves pressure testing the well to verify that it can withstand a specified pressure without leaking. The pressure testing is conducted in stages, testing each barrier individually. The WIT also includes visual inspections of the wellhead and other surface equipment to check for any signs of damage or corrosion. The results of the WIT are used to determine whether any remedial work is required to restore the well's integrity. If any leaks or other problems are detected, repairs must be made before the well can be safely suspended. WITs are typically performed at regular intervals during the suspension period, as well as before re-entering the well. This ensures that the well's integrity is maintained throughout the suspension period. Therefore, the WIT is a critical procedure for ensuring the safety and environmental protection of suspended wells.