METHOD FOR HYDRAULIC FRACTURING OF PRODUCTIVE FORMATION Russian patent published in 2016 - IPC E21B43/26 E21B43/02 E21B43/18 

FIELD: oil and gas industry.

SUBSTANCE: invention relates to oil and gas industry and can be used for intensification of oil under complicated geological and physical conditions of development. First at discrete time intervals, selected with successive increase time range is measured in well of seismoacoustic emission signals from formation medium. Based on change of their level of background values are assessed changes of stress-strain state of mine rocks. Method includes applying pressure-oscillatory action on formation so that pressure does not exceed breakdown pressure of formation. Value of changes of bottomhole pressure and frequency of generated oscillations is determined by filtration-capacitance parameters of formation medium. Acoustic emission spectral analysis is carried out from formation and comparison of time dynamics minima and maxima of stress-strain state of rocks is used to determine frequency bands of response of formation medium. During stabilisation of changes of bottomhole pressure, pressure-oscillatory action is stopped and fed to formation hydraulic fracturing fluid with simultaneous wave action on frequencies on identified ranges. Method includes continuously using information on state of real medium. Said information is processed in real time and used for energy-optimum process of formation of deep and branched cracks. Method includes simultaneously taking into account features of structure and internal processes of geologic environment that cause maximum oil inflow from formation to well and increasing oil recovery.

EFFECT: technical result is increase of efficiency of hydraulic fracturing.

16 cl, 2 dwg