METHOD FOR TREATMENT OF FLUID MEDIUM OF CASE OF REVERSE INFLOW COMING FROM WELL SITE Russian patent published in 2019 - IPC E21B43/34 C10L3/10 

FIELD: hydraulic engineering.

SUBSTANCE: invention relates to a method for treatment of fluid medium of reverse inflow coming from well site after stimulation of underground reservoir. Method for treatment of fluid medium of reverse inflow includes first mode of recuperation of carbon dioxide, in which fluid medium of reverse inflow comes from well site in mode of recuperation of carbon dioxide, at which fluid of reverse inflow is divided into flow rich with carbon dioxide and flow depleted with carbon dioxide gas, wherein the carbon dioxide-rich flow is cooled to form a liquid carbon dioxide product, while the carbon dioxide-depleted stream is used in downstream processing to facilitate formation of said liquid carbon dioxide product, and then said carbon dioxide-depleted flow is flared; continuing operation in said first carbon dioxide recovery mode until concentration of carbon dioxide in reverse inflow fluid decreases to a value selected in range of 50–80 mol% of carbon dioxide concentration, and then switching to the second carbon dioxide removal mode, in which the reverse inflow flow with low concentration of carbon dioxide gas is divided into a carbon dioxide-rich flow of permeate which is discharged or directed to a torch, and a retentate flow depleted with carbon dioxide gas which is recovered as rich with hydrocarbons product flow.

EFFECT: reduced costs when supplying carbon dioxide to a hydraulic fracturing well, reduced consumption of natural gas during flaring, separate production of gaseous and liquid hydrocarbons.

8 cl, 9 dwg, 5 tbl