Foamed cements reliably seal cased wellbores

A fully engineered, zonal-isolation process (EPP) can provide a reliable cement casing seal over the entire life of the well. Click here to enlarge imageThe process, which is predicated on the fully engineered application of foamed cement, was developed to meet zonal-isolation challenges presented by the following well conditions (Fig. 1):Lost-circulation and low-fracture gradients.Remedial squeezes.Crossflows.Poor bonding.Gas migration.Water flows.Cement-sheath failure.High downhole temperatures.BackgroundThe introduction of the oil field cementing process in the early 1900s revolutionized the oil and gas industry through the promotion of long-term production rates and the mitigation of...

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