METHOD FOR ASSESSMENT OF INTER-COLUMN INTER-FORMATION OVERFLOW IN A WELL Russian patent published in 2019 - IPC E21B47/103 

FIELD: oil and gas industry.

SUBSTANCE: invention relates to oil production, namely, to control of development of oil deposits by field-geophysical methods (FGM). It can be used for diagnostics and prevention of non-uniform development of multi-formation deposits of low permeability of profile monitoring for the purpose of further justification of measures for intensification and optimization of formation. Method of assessing intensity of inter-formation overflow based on thermal analysis results consists in recording a thermogram in a long-term idle or low-depression well in conditions of stabilizing temperature distribution in the wellbore, determining in the overflow interval the value of the normalized heat release coefficient "B" and estimating the flow rate of the flowing fluid as per this value. To increase accuracy of estimation due to less effect on result of absence of information on thermal properties of enclosing formations: well output to withdrawal mode with duration τ and flow rate Q_Σ, selected based on criteria justified by thermal simulation: τ_o – duration of inter-zone overflow period, Cv – volumetric heat capacity of barrel filler, λ_P, a_P – average values of the range of maximum possible for the analyzed well change in thermal conductivity and thermal conductivity of the enclosing rock mass, r_w is well radius; recording a thermogram in said mode; determining value of normalized coefficient of heat transfer B_Σ in interval Δz in this mode; calculation of volume flow rate in interval of overflow by formula Q=Q_ΣB/B_Σ.

EFFECT: quantitative estimation of liquid flow rate within inter-column inter-formation overflow.

1 cl, 3 dwg, 1 tbl