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...preceding flow period causes reservoir pressure to drop near the wellbore. ISIP is the pressure in the reservoir after the first shut-in period. The durati ...00px|thumb|{{figure number|3}}Example of how pressure is extrapolated from ISIP and FSIP on a Horner plot (pressure vs. psuedo or Horner time, or (T + ΔT)

;ISIP:initial shut-in pressure