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.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 sho...