Case Study Surge and Swab Pressure Prediction – Field Validation CHALLENGE Moving a drilling string or casing is accompanied by pressure variations. The accurate predic- tion of surge and swab pressures is critical in wells where the pressure must be maintained within narrow limits to ensure trouble-free drilling and comple- tion operation. SOLUTION Use SurgeMOD software to predict downhole pressure before running casing or calculate optimal running speeds. RESULTS The result is a higher percentage of successful casing/liner runs, as indicated by the following case study, where closely matching results between SurgeMOD prediction and PWD measurement were found. Excessive swab pressures may initiate a kick, while surge pressures in great magnitude can fracture formations. Th

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