METHOD FOR OPTIMISING PRODUCTION OF THE RESERVOIR FLUID FROM A BOREHOLE AFTER ACIDIC HYDRAULIC FRACTURING Russian patent published in 2021 - IPC E21B43/27 G01N15/08 

FIELD: petroleum industry.

SUBSTANCE: invention relates to production of the reservoir fluid after stimulation of boreholes by acidic hydraulic fracturing, namely to a method for increasing the flow rate of a borehole by selecting the borehole depression values ensuring the openness of the hydraulic fracturing crack during production. In order to implement the method for optimising production of the reservoir fluid from a borehole, acidic hydraulic fracturing is simulated for the selected borehole for the preset properties of the reservoir, accounting for the schedule of acidic hydraulic fracturing and the expected flow rate of the borehole. The distribution of width of the walls of the formed crack, etched as a result of acidic hydraulic fracturing, over the entire surface thereof is obtained as a result of simulation. The range of possible borehole depression values is selected, and for each depression value in the selected range, accounting for the obtained distribution of width of the etched walls of the crack and the preset properties of the reservoir, the profiles of crack opening, effective stresses applied to the walls of the crack, and hydraulic conductivity of the crack are calculated. Based on the resulting profiles of hydraulic conductivity of the crack, the full flow rate of the borehole is calculated for each borehole depression value. The depression values corresponding to the maximum indicators of the flow rate of the borehole or ensuring a flow rate no lower than the expected flow rate are selected, and the selected depression values are maintained in the subsequent production from the borehole.

EFFECT: ensured openness of the hydraulic fracturing crack during production due to the control over the depression, leading to an improved inflow of the reservoir fluid into the borehole.

4 cl, 7 dwg