METHOD OF ASSESSING THE PHASE STATE OF HYDROCARBON FLUIDS IN POROUS SPACE OF OIL AND GAS CONDENSATE RESERVOIRS BY A COMPLEX OF NEURAL METHODS Russian patent published in 2019 - IPC G01V5/10 

FIELD: geophysics.

SUBSTANCE: use: for geophysical studies by neutron methods of cased oil and gas condensate wells (OGCW), namely for assessment of phase state of light hydrocarbons in porous space of headers. Summary of invention consists in the fact that using neutron-neutron logging by epithermal neutrons (NNLet) in combination with SNGL – spectrometer neutron gamma-ray logging, allowing to determine phase state of hydrocarbons in porous space of headers at different radial distance from wall of production column (PC) - "far", "medium", "near", "well". Based on the results of measuring the intensity of the epithermal neutron fluxes on the small and large 2NNLet probes and the GIRS spectral intensity of the SNGL method in the porous space of the collector, calculating the collector porosity function F(C_p), function of saturation of "far" zone F(S_f), function of saturation the "middle" zone F(S_m), function of saturation "near" zone F(S_n), function of saturation the "well" F(S_w) and performing cross-raft construction of dependencies F(S_f) from F(C_p), F(S_m) from F(C_p), F(S_n) from F(C_p), F(S_w) from F(C_p), by means of which determining the geological parameters of saturation of the porous space at each given depth of the collector: C_g is the gas saturation coefficient, C_VGs is the volumetric gas saturation coefficient by the applied formulas.

EFFECT: broader functional capabilities of neutron methods and high information content of investigations.

3 cl, 2 dwg