1. n. [Well Testing]

The final buildup sequence in a drillstem test. The initial shut-in period is usually followed immediately by an extended period of flow. The well is then shut in for the final buildup period. Data obtained during this period are analyzed to determine permeability thickness, kh, and skin effect, s. Final flow periods commonly range from 4 to 24 hours, and final buildup periods from 6 to 48 hours.

See: buildup test,  drillstem test,  final flow period,  final flow rate,  final flowing pressure,  initial shut-in period,  permeability thickness,  skin effect