METHOD OF DETERMINING FORMATION HYDRAULIC FRACTURING PARAMETERS Russian patent published in 2020 - IPC E21B43/26 

FIELD: mining.

SUBSTANCE: invention relates to hydraulic fracturing of reservoirs and can be used in determining parameters used in process of calculation and analysis of operations during intensification of fluid inflow from formation, in particular, when determining fracture closing pressure and fracture pressure during hydraulic fracturing of formation (HF). Method comprises pumping of hydraulic fracturing fluid into formation to create hydraulic fracture, recording pressure and supply; stopping pumping of liquid into formation, recording pressure drop; obtaining a set of pressure change data in the well before, during and after pumping of liquid; loading in HF and visualization of data of pressure change in format of graphs of dependence of pressure in well from time; determination of approximate value of instant pressure of ISIP pumping stopping; displaying data of pressure variation and semi-logarithmic derivative of pressure on diagnostic Log-Log graph; identification of the mode of linear flow of the hydraulic fracturing fluid in the fracture and presence or absence of the mode of secondary influence of the well shaft; correcting the diagnostic Log-Log graph by bringing it to a normalized form by searching for an ISIP value such that the curve ΔP and semi-logarithmic derivative at section of linear flow of liquid in fracture are parallel to each other, tangent of angle of inclination of tangent to both curves is ½ and values ΔP twice more than semi-logarithmic derivative values; determining crack closing time using a normalized Log-Log diagnostic graph, wherein in case of identified mode of secondary influence of well shaft as time of closing of crack is selected initial divergence of semi-logarithmic derivative with straight line with tangent of inclination to axis OX, equal to 1, and in case of absence of identified mode of secondary influence of barrel as closing time of crack is selected initial divergence of semi-logarithmic derivative with straight line with tangent of inclination to axis OX, equal to ½; determination of closing pressure of crack P_cl using graphs of function of leaks of hydraulic fracturing fluid at moment of crack closing time; determination of pressure in fracture P_net.

EFFECT: technical result is higher accuracy of determining parameters of hydraulic fracturing.

6 cl, 6 dwg