METHOD FOR DETERMINING RELATIVE PHASE PERMEABILITIES OF FORMATION Russian patent published in 2013 - IPC E21B47/10 G01N15/08 

FIELD: oil and gas industry.

SUBSTANCE: method involves several well hydrodynamic survey (WHS) cycles at early development stage of oil wells at forced creation in the formation of differently directed two-phase filtrations. Representative reference sample collection of wells is determined. WHS surveys are performed in each of the wells, on the basis of which evaluation of current phase permeabilities as to oil k_{o_rel} and water k_{w_rel}, and initial water saturation K_{w_initial}.is performed. Values k_{o_rel}, k_{w_rel} and K_{w_initial} are compared, and relationships of the change between phase permeabilities and water saturation are determined. The corresponding general curves of phase permeabilities as to the unit are calculated. And during the operating period characterised by the change of average water cutting of well production of not less than 30% in comparison to the initial one, current water cutting of well production φ_w is determined simultaneously with WHS.

EFFECT: improving reliable and objective reproduction of relative phase permeabilities by providing the possibility of spreading relative phase permeabilities obtained for a certain well to other sections of the formation.

2 cl, 2 dwg