1. A system to provide an anticipated drillpipe pressure, hydraulic delay and a graphical depiction of choke changes in a wellbore during drilling operations, comprising: a) means for measuring drillpipe pressure; b) means for measuring casing pressure; c) means for measuring choke position; d) computer multi-processing means to calculate the hydraulic delay and anticipated drillpipe pressure; and e) wherein the hydraulic delay and anticipated drillpipe pressure is empirically calculated from drill pipe pressure, casing pressure, and choke position or choke change inputs, without requiring information on other parameters.