Regulatory tests differ by jurisdiction, but the engineering requirement is consistent: demonstrate that the well contains pressure and isolates protected intervals.
Mechanical Integrity Is a Local Requirement
How often does a well require a mechanical integrity test? Which pressure, duration and acceptance criteria apply? What happens after a failure? Across the United States and Canada, the answer depends on the well class, service, regulator and jurisdiction.
BioSqueeze reviewed requirements across 18 jurisdictions, including test intervals, pass/fail criteria, witness requirements and consequences of failure. The details vary, but the direction is consistent: operators are expected to know barrier condition, document performance and respond when integrity cannot be demonstrated.
What a Failed Test Actually Means
A failed test may originate in corrosion, a pinhole, a thread failure, a worn packer or another mechanical defect. The pressure response identifies that the system cannot hold; it does not automatically identify the precise pathway or the best repair method.
That makes diagnostics essential. Repair design should distinguish a discrete casing leak from annular migration, confirm the interval that must be treated and define the acceptance test that will verify success.
Conventional Repair Tradeoffs
Patches and liners can restore mechanical integrity but reduce internal diameter and leave hardware in the well. Cement is effective when it can be placed across an open annulus, but its particles cannot reliably enter the fine crack, pinhole or corrosion pathway that produced the failure. Resins can reach smaller features, but shrinkage and debonding may allow pathways to persist.
The appropriate choice depends on where the defect sits, whether cement is present in the annulus, the drift the operator must retain and the expected life of the repair.
A Full-Drift Mineral Repair
BioSqueeze uses low-viscosity fluids to enter the connected leak path and form biogenic limestone directly in cracks, pinholes and corrosion pits. The treatment leaves no permanent hardware in the wellbore and preserves full drift.
For an operator facing a failed mechanical integrity test, the objective is straightforward: diagnose the active pathway, select a repair that can reach it, and verify the result against the governing jurisdiction’s test criteria.