Which abandonment technique involves filling the wellbore with cement to isolate it?

Cementing is the abandonment technique that involves filling the wellbore with cement to isolate it. This process is commonly used to permanently plug and abandon wells that are no longer in use or are deemed uneconomical to produce. The cement is pumped into the wellbore and allowed to set, creating a barrier that prevents the flow of fluids between different zones in the well and between the well and the surrounding formations. This helps to protect groundwater and prevent any potential environmental hazards associated with the well.