METHOD FOR PRODUCTION OF SOFT WATER FOR INJECTION INTO BED Russian patent published in 2014 - IPC C02F1/42 E21B43/20 

FIELD: oil and gas industry.

SUBSTANCE: invention relates to production of soft water for injection into bed. The method includes: (a) production of soft water by means of (i) delivery of source water having total dissolved-solids content up to 15000 mg/l and polyvalent cations content more than 40 mg/l to the filter containing a layer of cation-exchange resin in polyvalent cation form; (ii) passage of source water through the layer of cation-exchange resin; (iii) output of soft water for injection from the filter, at that polyvalent cations content in water is up to 40 mg/l; (b) regeneration of cation-exchange resin by means of (i) delivery of regenerant solution to the filter, at that the regenerant solution is represented by natural water with high content of salts, high concentration of monovalent and polyvalent cations so that the softening limit for source water is equal up to 40 mg/l of polyvalent cations where the softening limit is defined as the softening coefficient multiplied by concentration of polyvalent cations in source water (mg/l) and where the softening coefficient is calculated in the following way: (molar concentration of monovalent cations in source water)²/(molar concentration of polyvalent cations in source water) : (molar concentration of monovalent cations in the regenerant solution)²/(molar concentration of polyvalent cations in the regenerant solution).

EFFECT: intensification of hydrocarbons extraction from the bed.

24 cl, 3 dwg, 1 tbl, 1 ex