CONTROL METHOD OF FLUID MEDIUM LOSSES PROPERTIES FROM FLUID MEDIUMS ON BASIS OF VISCOELASTIC SURFACE-ACTIVE AGENTS Russian patent published in 2009 - IPC E21B43/22 E21B43/26 

FIELD: oil and gas industry.

SUBSTANCE: invention relates to compositions and methods of loss enhancement of fluid medium from fluid mediums of viscoelastic surface active agents SAG during the treatment, such as operations of layer hydraulic fracturing or well pigging. Treatment method of underground formation, includes stages: (a) providing of aquatic fluid medium, containing colloidal particle suspension and thickening amount of viscoelastic SAG, herewith colloidal particle are materialo, selected from the group consisting of aluminium oxide, antimony oxide, tin oxide, cerium oxide, yttrium oxide and zirconium oxide, (b) injection of specified fluid medium into well, passing into the underground formation with penetrability between preliminary 5 and approximately 100 mD. Treatment method of underground formation includes stages: (a) providing of aquatic fluid medium, containing colloidal particle suspension, viscoelastic SAG and hydrophobic modified polymer, herewith hydrophobic modified polymer presence at concentration between approximately its overlap concentration c*, and approximately its complication concentration C_e, colloidal particles are the material, selected from the group, consisting of aluminium oxide, antimony oxide, tin oxide, cerium oxide, yttrium oxide and zirconium oxide, (b) injection of specified fluid medium into well, ssing into the underground formation with penetrability between preliminary 5 and approximately 100 mD.

EFFECT: regulation of fluid medium losses by additives without solid particles.

11 cl, 7 dwg