Clastic deposits of the Vietsovpetro fields are characterized by a complex geological structure, strong vertical and lateral variability of pay zones. Factors complicating the development are a large oil-bearing layer with a high degree of dissection and low permeability. Standard hydraulic fracturing does not allow the fracture to cover the entire pay zone, and carrying out the interval hydraulic fracturing with backfilling leads to an increase in time (additional tripping, backfilling, perforation, long-term discharge and killing of the well, bottom-hole flushing, mobilization and demobilization of the hydraulic fracturing units) and the cost of work. To optimize the hydraulic fracturing process, as well as to reduce costs and increase the economic efficiency of activities, a technology using soluble flow diverter balls is proposed for implementation. The technology allows for selective hydraulic fracturing of two or more pay zones in one packer run and one unit approach, while providing a significant reduction in financial and time costs, increasing the economic profitability of the activities Flow diverter balls are a solid substance with a specific gravity of up to 1.3 g/cm3. - Standard ball sizes are 16-22 mm; - Temperature range of use 27–135°C; - Withstand differential pressure - 680 atm (10000 psi); - The balls completely dissolve under reservoir conditions in a given time interval; - The internal diameter of the tubing should be three times the diameter of the ball when injecting and landing a group of balls; - The number and type of balls are selected based on the number of perforations and the thermobaric characteristics of the well; - The balls are supplied through the Ball injector unit, or through a bypass line; - The number of supplied balls is taken equal to the number of perforation holes with a 30% margin; - The size of the ball should be larger by 6.35 mm or more than the diameter of the perforations. Operations with balls is carried out in several stages. First stage: proppant is injected into a more permeable interval of the formation. Second stage: to feed the balls after the last proppant stage. The balls are supplied using a Ball injector device, which is mounted in the high pressure line in the area between the wellhead and the check valve. The balls are fed in an intermediate stage in a linear gel. The number of supplied balls is equal to the number of perforation holes with a 30% margin. The supply of additional balls is necessary to prevent such risks as destruction of the ball, failure of the ball to enter the perforation hole and pushing the ball through the perforation interval. As the balls approach the perforation interval, the injection speed decreases; once the balls are landed, the injection speed returns to its previous value. After the balls cover the perforation interval, as a rule, an increase in pressure is observed, which indirectly indicates the achievement of the set goal. Third stage: proppant is injected into the next treatment interval. If there are additional treatment intervals, the ball feeding procedure is repeated similarly to the previous ones. The entire process is carried out continuously. For pilot testing, the following target areas are proposed: Upper Oligocene (clastic reservoir) of White Tiger field, Lower Miocene (clastic reservoir) of Dragon field. | 