INTERFERENCE TEST ANALYSIS IN LIMITED RESERVOIRS USING THE PRESSURE DERIVATIVE APPROACH - FIELD EXAMPLE

Application of type curves to interference testing has usually provide d poor results due to match non-uniqueness. In this paper, we present three new sets of type curves using the dimensionless pressure groups P-D and the associated derivative vs. time function tDA x(E)/y(E) for the case of an observation well in a rectangular reservoir. These thre e sets of type curves are generated for the case of the producing well at the corner, end or middle of the rectangular reservoir. The charac ter of this set of type curves, similar to Bourdet et al; type curves, provides a great improvement in obtaining a unique type curve match. This study then explains the use of this new set of type curves for an interference test in a limited reservoir using the Bourdet et al. pre ssure derivative approach. A field example is included to demonstrate the application of this method to actual test data and how cartesian m ethods are used to verify the match. Flow regimes covered in the analy sis include infinite acting pressure response with wellbore storage an d skin at both the active and observation wells, as well as linear flo w and pseudo-steady state flow.