Well Integrity

Open annular volume, bulk voids and accessible intervals where little or no cement is present and a cement slurry can be placed with reliable isolation.

When cement is already in the annulus, slurry particles and rheology limit entry into its micro-annuli, fine channels and corrosion pathways. Cement can also become gas-cut or shrink while setting, leaving connected leakage paths behind.

Discrete, accessible leaks or open annular volume with little or no cement, where placement and cure conditions can be tightly controlled.

Resin viscosity and cure behavior can restrict penetration through cemented annuli. Resins contract while bonding and curing, which can leave or create micro-channels at the steel or cement interface.

A temporary response to annular gas migration where deforming the casing may compress adjacent cement and make a pathway more tortuous.

Expansion does not remove or fill the pathway and may only delay renewed migration. The force can damage pipe, cement and nearby hardware such as collars while leaving distributed defects beyond the expanded interval untreated.

Known, localized mechanical casing damage where internal hardware can span the defect and reduced wellbore ID is acceptable.

Patches and liners permanently restrict the wellbore, limiting pump rates, tool access and future completion or intervention options. They isolate the interval but do not repair defects within an existing cement barrier.