Patent ID: 9163499
Filing Date: 2015-10-20
Classification: E21B,G01V

Abstract:
1. A method of determining reservoir pressure from a reservoir: (a) injecting, by a PUMP, a fluid into a well drilled into the reservoir; (b) measuring, by one or more sensors, one or more parameters indicative of reservoir pressure over a period time to form a baseline dataset, wherein the one or more parameters include at least bottom hole pressure and volumetric flow rate; (c) inducing, via the PUMP, a change in an injection rate or injection pressure of the fluid; (d) measuring, by the one or more sensors, the one or more parameters indicative of reservoir pressure for at least a second period of time to form a calibration dataset; (e) estimating, by the one or more processors, a reservoir pressure value, wherein estimating further comprises plotting the baseline dataset and the calibration datasets based upon the following equation: where q is the volumetric flow rate, μ is the dynamic viscosity, P (f) plotting, by the one or more processors, fluid injection volume versus a ratio of pressure change to flow rate for the baseline dataset and the calibration datasets to form a baseline curve and calibration curve based upon the reservoir pressure value; (g) comparing, by the one or more processors, the baseline curve and the calibration curve to determine if the reservoir pressure value is correct; and (h) if the baseline curve and the calibration curve are not aligned, then repeating (e) through (g) until the baseline curve and the calibration curve are aligned.