SYSTEM AND METHOD FOR INJECTING WORKING FLUIDS INTO A HIGH-PRESSURE INJECTION LINE Russian patent published in 2021 - IPC E21B43/26 E21B21/00 

FIELD: oil industry.

SUBSTANCE: group of inventions relates to a system and method for delivering oilfield material to a well located on a drilling site. The hydraulic fracturing system contains a solution tank, an injection line, a set of hydraulic fracturing line valves, and a control system. The injection line is located between the high-pressure pump and the treatment line. It is designed to be fluidly connected to wellhead equipment. Multiple hydraulic fracturing line valves are located near the injection line. The first valve of the multiple valves is located between the processing line and the process discharge line. The second valve from the set of valves is located along the injection line between the solution line and the hydraulic fracturing manifold (HFM) on the chassis. The control system is connected with the possibility of communication with multiple valves and is designed to provide fluid isolation of a part of the injection line between the valves to create a high-pressure chamber for holding oilfield materials until they are displaced into the processing line, filling the injection line with a certain amount of solution using the first valve out of the multiple valves and pumping the solution into the treatment line using a second valve of the multiple valves.

EFFECT: increasing the efficiency of the method and the reliability of the system..

20 cl, 9 dwg