SELF-CLEANING LIQUID FOR CONTROL OF WELL Russian patent published in 2011 - IPC E21B43/26 C09K8/88 

FIELD: gas and oil production.

SUBSTANCE: for decrease of liquid flow from well into reservoir or from reservoir into well procedure for treatment of well passing through underground reservoir consists in introduction of suspension containing thickened viscous-elastic surface-active liquid, agent controlling pH and degradable first solid substance. Further, the procedure consists in facilitating said suspension to prevent said flow of liquid for specified period of time and in facilitating first solid substance to decompose and said viscous-elastic surface active fluid to destroy by means of product of decomposition of said first solid substance. The said degradable first solid substance is decomposed at temperature of the reservoir for time of approximately 4 hours and 100 days. The said agent controlling pH retards rate of decomposition of the said degradable first solid substance. The invention is developed in dependent points of formula.

EFFECT: raised efficiency of well control for desired period of time.

15 cl, 3 ex, 5 dwg