Abstract
In the article the development of a mathematical model describing the PRC is studied on the base of pressure recovery curve method.Detailed processing of the pressure recovery curve made it possible to determine the deterioration of reservoir permeability in many wells. Here two methods are considered - stationary (steady conditions of selection) and non- stationary.The article proves that the use of these methods allows to develop a mathematical model to increase the determination of this task.On the base of numerical simulation, the following facts had impact on the results of the pressure recovery curve: well shutdown time, taking into account the initial transition section, taking into account curve change section before well shutdown.The study of variable factors impact on the results is carried out by interval estimation.The mathematical model describing the pressure recovery curve is local and changes its structures. This model can be used in industry conditions.
Highlights
As it is known, two methods are used for hydrodynamic studies of oil wells and reservoirs - stationary (1,2) and non-stationary.In the stationary method, at some steady conditions of the studied oil well operation, bottomhole pressure and yield are measured, leaving the well to be operated in this condition for several hours
Four-five points of the yield are taken off in case of curves being dependent on bottom-hole pressure curve and the indicator curves are constructed [1,2]
The indicator curves determine the coefficients of well productivity, permeability, hydro- piezoconductivity of the reservoir
Summary
Two methods are used for hydrodynamic studies of oil wells and reservoirs - stationary (steady selection conditions) (1,2) and non-stationary. At some steady conditions of the studied oil well operation, bottomhole pressure and yield are measured, leaving the well to be operated in this condition for several hours (from 12 hours to 24 hours).
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