METHOD FOR THERMAL ACID TREATMENT OF BOTTOMHOLE FORMATION ZONE Russian patent published in 2021 - IPC E21B43/27 E21B36/04 

FIELD: oil production.

SUBSTANCE: invention relates to methods for intensifying oil production from carbonate reservoirs by carrying out hydrochloric acid treatment of the bottomhole formation zone and can be used to increase the inflow of liquid and oil to wells operating hydrophobized carbonate formations. A method is proposed for thermoacid treatment of the bottomhole formation zone, including lowering the tubing string to the productive carbonate formation, sealing the annular space with a packer, heating the acid composition in the wellbore and pumping hot acid into the formation. At the same time, an induction heater with a flow turbulator in its upper part and a temperature sensor in its lower part with the function of transmitting data on the ambient temperature through the heater power supply cable to the pumping process control station is lowered into the well on the tubing string. An induction heater is located above the formation to maintain the temperature of the acid composition at the required level by adjusting the power of the induction heater and the volumetric flow rate of the acid composition.

EFFECT: enhancing the coverage of the formation by acid stimulation using hot acid without reducing the activity and concentration of the acid composition.

1 cl, 1 dwg