METHOD FOR GEOCHEMICAL MONITORING OF WELL PERFORMANCE EVALUATION AFTER APPLICATION OF CHEMICAL METHODS FOR ENHANCED OIL RECOVERY Russian patent published in 2023 - IPC E21B47/10 E21B49/08 

FIELD: oil field development.

SUBSTANCE: invention relates to the method for geochemical monitoring of well performance evaluation after the application of chemical methods for enhanced oil recovery. According to the method, fluids of production and injection wells are examined by studying background geochemical fluid samples at selected wells in the area affected by chemical methods of enhanced oil recovery using geochemical and photocolorimetric methods. Next, the target geochemical features of the reservoir fluid of the studied fluid samples obtained as a result of the first operation are identified. The reagent of chemical methods for increasing oil recovery is injected into the injection well. Fluid samples are taken for their analysis for geochemical and photocolorimetric studies on selected reacting production wells. Geochemical and photocolorimetric analysis of the data obtained in the laboratory are carried out, a comparative analysis of geochemical and photocolorimetric data of the well before and after injection of chemicals is performed, the effectiveness of the effects of chemicals on the reservoir is evaluated. The beginning of the response of the investigated wells to the performed chemical treatment is determined, changes in the direction of filtration flows are determined as a result of the chemical treatment of the injection well, with the possibility of increasing the efficiency of oil production.

EFFECT: evaluating the effectiveness of the use of chemical methods for enhanced oil recovery.

1 cl, 3 dwg