METHOD FOR TREATMENT OF FORMATION Russian patent published in 1996 - IPC

FIELD: gas and oil producing industry. SUBSTANCE: method for treatment of formation includes successive treatment of zone round the well with reagent by forcing base technological solution which disintegrates mud fills. Base technological solution contains aqueous solution of bicarbonates of univalent metals (cations) in the amount of 5-12 mas.% and surfactant amounting to 0.5-2.0%. After some time taken for reaction, reaction products are removed and then, aerated base technological solution is injected and forced by air in the amount equalling ratio of thickness of highly and low-permeable beds. Then, method operations are repeated with the use of base technological solution in form of solutions of oxygen-containing compounds of sulfur and surfactant. EFFECT: provision of involving into operation of low-permeable beds of mixed clay reservoirs and attaining design recovery of formation. 3 tbl