METHOD FOR DETERMINATION OF WATER CUT FACTOR AND COMPOSITION OF OIL WELL INFLUX Russian patent published in 2014 - IPC E21B49/00 G01V5/14 G01N1/00 

FIELD: oil and gas industry.

SUBSTANCE: method includes well survey using impulse neutron spectrometric surveying, determination of rock fractional analysis, including porosity and instant oil saturation coefficient (K_os). Core samples are prepared preliminary from collectors opened by key wells; by results of their survey instant water saturation (K_ws), coefficients of relative permeability to oil and water (K'_opr K'_wpr), exponential values of relative permeability to water and oil (n_w n_o), clayiness index (K_cl), porosity factor (K_p), petrophysical parameters (a, b) for relations of residual water saturation factor and ratio clay volume to porosity, residual oil saturation factor (K_or); then residual water saturation factor is calculated according to the formula K_wr=a*(K_cl/K_p)+b, thereafter water cut factor (K_wc) is calculated and against the latter expected composition of influx is evaluated.

EFFECT: improving quality and reliability of log data interpretation.

3 dwg