METHOD FOR DETERMINING GEOMETRY OF FRACTURES DURING FORMATION HYDRAULIC FRACTURING (HFF) Russian patent published in 2019 - IPC E21B49/00 G01V1/42 E21B43/267 

FIELD: oil and gas industry.

SUBSTANCE: invention relates to oil and gas industry, to hydraulic fracturing operations, particularly to means of identification of cracks. Method of determining geometry of fractures during hydraulic fracturing of formation (HFF), using proppant containing additional emitting material, and using emitting device lowered into well, characterized by that in process HFF into liquid HFF together with the proppant, mixed metal rings or disks with diameter of 0.5–1.5 mm are supplied, with thickness of 0.1–0.5 mm in concentration of about 1–2 tons per 50 tons of proppant, after HFF a geophysical instrument is lowered into the well, which includes a radio transmitter emitting a phase-modulated signal in the frequency range of 100 KHz…10 MHz, receiver and gyroscope, geophysical instrument is oriented in the intended direction of the fracture HFF, and during measurements, the geophysical instrument is rotated through angles of up to 100, then angles with the largest reflected signal are measured by means of a gyroscope and the direction of the crack is determined, after finding the direction of the crack, data are received on the spectrum of the received signal, taking into account the spectrum of the radio transmitter and the spectrum of the receiver, spectral reflectivity of the crack is found HFF, filled with metal rings or disks, measurements are repeated at several depths, depth at which the reflected signal is not identified correspond to vertical boundaries of the fracture, obtaining spectral reflectivity of the fracture at corresponding depths, further processing of transmitted data on power of the received signal, its spectrum depending on the angle and height of the geophysical instrument, specifying the angle of the direction of the crack, and by analysis of the minimum and maximum of the spectrum at different height, determining the length of the crack at different height, characterizing the geometry of the crack.

EFFECT: high accuracy of determining fracture geometry HFF, determination of its length at different heights.

3 cl, 5 dwg