METHOD OF BOTTOMHOLE FORMATION ZONE TREATMENT IN PRODUCTION WELL Russian patent published in 2020 - IPC E21B43/27 

FIELD: mining.

SUBSTANCE: invention relates to a method of processing a bottomhole formation zone of a production well. Method of treatment of bottomhole formation zone of production well includes lowering of tubing string into bottomhole with shank, injection of reagent and hot water into formation, lowering of downhole pump on tubing to well, extraction of well product by pump. Acid composition is used as reagents. Prior to hitting of the tubing string, the formation intake capacity is pre-determined, the required volume of reagent pumping and the reaction time of the acid composition in hot state with the material of pipes lowered into the well, proceeding from this, cross-section area of annular space is selected to exclude active reaction of acid composition with material of well pipes. Pumping column is concentrically lowered to the well before pumping with pump and outer diameter providing selected cross-section area outside these production pipes, through which acid composition is pumped, which is pumped by hot water into the formation. After required for reaction of acid composition of process holding, well production is immediately started to take away with bottom pump. If necessary, acid treatment of the bed is performed in several cycles in combination with extraction of the product of the formation to obtain the required permeability of the bottomhole zone.

EFFECT: technical result is possibility of performing thermal acid treatment of bottomhole formation zone without lowering-lifting operations of pumping equipment.

3 cl, 2 dwg, 2 ex