METHOD OF EQUALIZATION OF INJECTION WELL INJECTIVITY PROFILE Russian patent published in 2001 - IPC

FIELD: oil and gas producing industry, particularly, methods of oil and gas production from drilled wells. SUBSTANCE: method includes injection of aqueous solutions of aluminum sulfate and alkali preliminarily mixed to obtain mixture pH equalling 3.8. Then, injected into formation is spacer fluid in the form of water, calcium chloride solution and again spacer fluid in the form of water. EFFECT: increased formation oil and gas recovery and reduced water encroachment of producing wells due to increased stretching of isolation screen, increased depth of penetration of dispersed particles into porous medium owing to clogging of fluid-conducting channels of remote zone of formation. 1 tbl