INHOMOGENEOUS DISTRIBUTION OF PROPPANT WITH REMOVABLE EXTRA-METRIC FILLER MATERIAL IN FORMATION HYDRAULIC FRACTURING Russian patent published in 2017 - IPC E21B43/267 

FIELD: mining.

SUBSTANCE: group of inventions relates to intensification of wells, drilling underground formations, and more specifically to fracturing intensification by means of introduction into hydraulic fracturing of proppant for formation of low resistance zones to hydrocarbon production. According to method performing introduction of well treatment liquid, containing proppant and extra-metric material, through borehole into underground formation fracture. Liquid is introduced with different and variable in pulsed mode proppant concentration in pumping curve. Optimized pumping schedule is based on liquid and formation properties and/or introduction is achieved by varying of pumping rates in pulses. Forming plurality of proppant clusters and degradable extra-metric material in fracture. Proppant is compacted into clusters by degradable extra-metric material. At that, pumping schedule is controlled in real time to ensure required fracture length, supports distribution along fracture and its conductivity. To do so, adjusting pumping duration and rate for proppant suspension pulses. At last stage proppant pumping is carried out without pulses.

EFFECT: technical result is increased intensification efficiency.

38 cl, 9 dwg