Pressure build-up test under elastic-wave action on the reservoir

Abstract

The influence of elastic vibrations on productive reservoirs increases oil extraction since filtration properties of a saturated collector change under the influence of elastic waves. Viscosity of reservoir fluids decreases and the permeability of a porous medium grows. The changes in filtration properties may be found using the results of hydrodynamic methods of boreholes research. The present work studies the prospects of applying pressure build-up tests at the wells start-up and shutdown to evaluate the changes in properties of productive reservoir. A mathematical model of plane-parallel filtration was developed for classical elastic mode applying to porous medium with heterogeneity of properties due to acoustic influence. A model reservoir is studied with parameters corresponding to a real field. A comparison of computational data was carried out for homogeneous and heterogeneous reservoirs about the change in the way pressure build-up of wells depends on time when shutting down wells. It has been shown that hydrodynamic pressure build-up research of the well before and after the acoustic treatment on the reservoir allows estimating the changes in reservoir properties caused by the treatment.