RESERVOIR CONDUCTIVITY DETERMINATION METHOD Russian patent published in 2007 - IPC E21B47/00 E21B43/00 

FIELD: oil industry, particularly to develop oil reservoir and to determine water permeability of productive reservoir.

SUBSTANCE: method involves operating well in steady-state regime before hydrodynamic research performance in well; carrying-out well hydrodynamic research by pressure recovery operation; determining bottom pressure and continuing reservoir fluid influx in well after well shut-down; performing mathematical treatment of measurement results. First of all reservoir is preliminarily investigated by well interference testing or by means of filtration pressure waves and pressure conductivity factor in reservoir and reduced well radius are determined, wherein the reduced well radius takes into account hydrodynamic imperfection of well. Mathematical treatment includes plotting a curve shoving dependence of relative dimension of disturbed reservoir zone on well fluid influx affection as a function of disturbance front propagation in well. The curve is approximated by polynomial. Magnitudes of function of fluid influx affection on disturbance front propagation, relative dimension of disturbed reservoir zone and bottom pressure recovery dependence are serially calculated for each bottom pressure increase and fluid influx in well measurement. Then curve showing bottom pressure increase as a function of continuing fluid influx in well is plotted and approximated by polynomial. Conductivity coefficient in steady-state well operation regime is determined from free term of the polynomial. Conductivity coefficient corresponding to fluid influx in well with output is calculated for each output measuring. Then reservoir drawdown in steady-state regime of well operation is calculated and curve demonstrating conductivity as a function of reservoir drawdown in steady-state regime of producing well operation is plotted.

EFFECT: increased accuracy and simplicity of conductivity coefficient as a function of reservoir drawdown in producing well, decreased time and oil losses during production.

1 ex, 2 tbl, 5 dwg