Patent ID: 7248969

Claim:
A well injection pressure controller comprising: a. an injection goal flow rate of fluid to be injected into an injector well, the injector well having an injection pressure; b. a time measurement device, a pressure measurement device and a cumulative flow device, said pressure measurement device and said cumulative flow device monitoring the injector well; c. an historical data set {t i p i q i } for iε(1,2, . . . n), n≧1 of related prior samples over an i th interval for the injector well containing at least a sample time t i , an average injection pressure p i on the interval, and a cumulative measure of the volume of fluid injected into the injector well q i as of the sample time t i on the interval, said historical data set accumulated through sampling of said time measurement device, said pressure measurement device and said cumulative flow device; d. a computer that uses the historical data set and the injection goal flow rate, to calculate an optimal injection pressure p inj for a subsequent interval of fluid injection; and e. an output device that controls the injector well injection pressure to be substantially the optimal injection pressure p inj .