METHOD OF PREPARING FLUID-SALT SOLUTION AND DEVICE TO THIS END Russian patent published in 2012 - IPC E21B43/12 C02F1/04 

FIELD: oil-and-gas production.

SUBSTANCE: proposed method comprises selecting initial fluid-salt solution of natural origin and/or its semi-finished product with content of dissolved salts providing for initial density in preset limits. Prepared solution is cleaned of gaseous, and/or mechanical, and/or mineral, and/or biological admixtures. Solution, thus produced, is concentrated in preset number of stages. Solution density and concentration is increased in every said stage to preselected intermediate value. Concentrated solution is forced by high-pressure pumps through integrated units of reversed osmosis. Said units are made up of concentrate and permeate tanks are separated by reversed osmosis membranes. Said reversed osmosis is used at every stage to increase salt solution concentration. Pressure of 30-190 atm is used in every concentrate tank in time interval wherein intermediate density is increased to final magnitude.

EFFECT: reduced power consumption, higher efficiency, possibility of process automation.

4 cl, 2 tbl, 2 ex