Patent Document ID: 20090276156
Application ID: 12435564
Patent Flag: 0

Claim One:
1. A method of estimating reservoir pressure in a subsurface hydrocarbon reservoir, comprising the steps of: receiving data corresponding to pressure measurements at a wellbore of a well; operating a computer to apply the received data to a model of the well to determine an operating mode of the well over time; responsive to a change in the determined operating mode of the well indicating an abrupt change in flow at the well, receiving additional data corresponding to pressure measurements at the wellbore of the well over a period of time following the change in operating mode; then operating the computer on the received additional data to determine an estimate of reservoir pressure at the well; then notifying a user of the change in operating mode at the well and of the estimated reservoir pressure; and storing, in a memory resource accessible to the computer, a value of estimated reservoir pressure for the well corresponding to the estimated reservoir pressure.