WELL PRODUCTION RATE PREDICTION METHOD TAKING INTO ACCOUNT ANISOTROPY OF PERMEABILITY OF CARBONATE ROCKS Russian patent published in 2022 - IPC E21B47/10 

FIELD: oil, gas and coke-chemical industry.

SUBSTANCE: invention relates to the oil industry and can be used in the development of complex carbonate oil deposits characterized by anisotropy of permeability of rocks. Proposed method for determining well flow rate taking into account anisotropy of permeability of rocks includes determining water cut of production (W); gas factor (G_f); formation thickness (h); depth of opened interval (H_open); porosity coefficient (k_por); annular pressure (P_ann); formation pressure (P_form); bottomhole pressure (P_bot); skin factor (S); oil viscosity (μ); value of horizontal (k_hor) and vertical (k_vert) permeability. Using these parameters without taking into account the values of the parameter P_comp, the well flow rate : is calculated: In the case of using the P_comp value as a classifier, which is calculated by the following formula: , where P_in - individual probabilities P(h), P(H_open), P(k_por) taking into account k_hor and k_vert; P is their product; the class of the liquid flow rate model is determined by: P_comp> 0.5 - fluid flow rate model is referred to the first class, at P_comp < 0.5 - fluid flow rate model is referred to the second class, according to which fluid flow rate is calculated.

EFFECT: improving accuracy and reliability of determination of flow rate of wells, which operate complex carbonate reservoirs, characterized by anisotropy of permeability of rocks.

1 cl, 2 dwg, 1 tbl