Coiled-tubing vacuum removes drilling-induced damage

A new technique uses concentric coiled tubing with a jet pump to remove drilling-induced damage from horizontal wellbores. The jet pump creates a pressure drop across the formation sandface that results in unwanted fluids, polymer residue, and drilling solids being transported to surface.Horizontal wells increase production rates by targeting multiple zones, maximizing reservoir exposure, and reducing drawdowns to minimize premature water or gas coning problems. Many of these wells, however, include nonperforated completions that result in both mud-filtrate-induced formation damage and the incomplete removal of mud cake along the entire openhole. Formation damage and mud cake can impair p...

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