PRESSURE AND PRESSURE DERIVATIVE ANALYSIS FORLONG NATURALLY FRACTURED RESERVOIRS USING THETDS TECHNIQUE

摘要

Normally, in a heterogeneous formation, the transition period of flow from fissures to matrix takesplace during the radial flow regime. However, depending upon the value of the interporosity flow parameter, thistransition period can show up before or after the radial flow regime. An accurate understanding of how the reservoirproduces and the magnitude of producible reserves can lead to competent decisions and adequate reservoirmanagement.So far, no methodology for interpretation of pressure tests under the above mentioned conditions has been presented.Currently, an interpretation study can only be achieved by nonlinearregression analysis (simulation) which isobviously related to nonunique solutions. Therefore, in this paper, a detailed analysis of pressure and pressurederivative behavior for a vertical well in an elongated closed heterogeneous formation is presented. We studiedindependently each flow regime, especially the duallinearflow regime since it is the most characteristic?fingerprint? of these systems? new equations to characterize such reservoirs is introduced and were successfullyverified by interpreting both field and synthetic pressure tests for oil reservoirs.