METHOD FOR DETERMINING GEOLOGICAL AND PHYSICAL PROPERTIES OF FORMATION AND OIL RESERVES Russian patent published in 2023 - IPC E21B49/00 E21B47/10 

FIELD: oil industry.

SUBSTANCE: method for determining the geological and physical properties of a formation and oil reserves is claimed. The method includes the stage at which the boundaries of the developed oil reservoir are set. Also, the method includes a step at which geological reserves are determined and initial oil saturation distribution maps are set. Adjacent areas are also distinguished, through the dividing lines of which the absence of hydrocarbon flows is allowed. For each selected area, divided into cells, the maximum width of each of which is less than the minimum equivalent well influence radius, a system of nodes is determined, each of which is characterized by the parameters of a real or fictitious well, located in the cell node. Also, for each production well, influencing injection wells are set, the distance from which to the corresponding production well is less than the specified maximum distance. For each of the production wells, the share in production of the corresponding production well of each of the given influencing injection wells is determined. The share of influence decreases with increasing distance according to a predetermined dependence on the distance between wells. The total impact of the influencing injection wells on the oil production of the corresponding production well corresponds to the already accumulated oil recovery for the specified well. For production wells, the shape of the zone of influence of the production well is determined, such that the zone of influence is formed by a polygon with at least four vertices, where each of the vertices of the polygon is located on one of the rays emanating from the corresponding production well. The method also includes the step of scaling the zone of influence so that the area of the polygon having the shape of the zone of influence is equal to the area of a circle with the previously calculated radius for the corresponding well, and the polygon built on vectors determines the body, the volume of which is reservoir conditions corresponds to the volume of oil sampled by the well. According to the parameters of oil production of production wells and injection wells, the current distribution of oil saturation of the formation is determined. Also, various parameters of geological and technical measures on the wells of the formation are set. The change in oil saturation is predicted for given parameters of production and injection wells by taking into account the parameters of wells and mutual influence, and the parameters of geological and technical measures of the formation are used, which, in accordance with the forecast, provide the maximum level of oil recovery for carrying out geological and technical measures.

EFFECT: improving the accuracy of determining hydrocarbon reserves in underground reservoirs, the degree of watering and calculating the determination of optimal oil recovery, providing the possibility of increasing the efficiency of hydrocarbon production from underground reservoirs.

3 cl, 6 dwg