Analysis of Pressure Response to Variable Rate Imputs

Abstract

Abstract Mathematical models are used to relate pressure response (output) to flow rate history (input). The solution may not be unique due to the fact that different models can give same response to different input function. However, this drawback can be minimized by careful well test design in such a way that the measured responses are superposition of series of impulses. This research work presents an investigation on an approach to pressure transient response to variable rate change of production. It is hinged on the view that a diffusion process is a process of equalization than differentiation. The objective is with installation of bottom hole pressure gauges, and belief that rapidly acquired data critical for future reservoir management are available for interference testing during field start-up. Vital concerns over reservoir continuity were answered immediately, allowing the operators to implement fast-track plans for pressure maintenance to optimize oil recovery. Consequently, with the increasing number of permanent gauge installations, interference testing becomes more cost efficient than conventional methods, and inverse problem is solved with unique solution. Further, there is improved measure of knowledge on reservoir continuity, drive mechanism and recoverable reserved