METHOD TO TREAT BOTTOMHOLE AREA OF PRODUCTION WELL Russian patent published in 2015 - IPC E21B43/27 

FIELD: oil and gas industry.

SUBSTANCE: method includes the detection of dependence between an adsorption layer structure and the concentration of non-ionogenic surfactant. The concentration of the surfactant in an aqueous solution of the non-ionogenic surfactant is accepted on the condition of formation of an "island" adsorption layer on the surface of the rock - alternating hydrophilic sections of an oil reservoir surface and hydrophobic sections of absorbed molecules of the surfactant providing for structuring of oil drops in the flow. A well is selected for the operation. Control measurements of yield, well head and bottom hole pressures are carried out. The wells are investigated at stabilised and transient conditions. An acid-containing solution is pumped to the well bottom hole. Then the acid-containing solution is removed from the well by well flushing with oil. Then a packer device is installed into the well. Further pumping of a water-removing composition is carried out, as well as the aqueous solution of non-ionogenic surfactant, displacing fluid into the production well. The well is soaked, and then oil is uptaken via production wells.

EFFECT: increased efficiency of treatment due to the development of a structured adsorption layer of surfactants in a bed.

1 ex, 5 tbl, 6 dwg