METHOD FOR PREVENTING THE DEPOSITION OF SALTS AND ASPHALTENE-RESIN-PARAFFIN DEPOSITS ON DOWNHOLE PUMPING EQUIPMENT Russian patent published in 2023 - IPC E21B37/06 C09K8/536 

FIELD: oil production.

SUBSTANCE: increasing the efficiency of protection of downhole pumping equipment from salt and asphaltene-resin-paraffin deposits due to uniform removal of the inhibitor, exclusion of deposits formation on downhole pumping equipment, control over inhibitor consumption, as well as expansion of the arsenal of means for preventing salt and asphaltene-resin-paraffin deposits on deep-well pumping equipment. In a method for preventing the deposition of salts and asphaltene-resin-paraffin deposits on downhole pumping equipment, the reagent is prepared by mixing the components to form cylinders, or balls, or granules with a density of not less than 0.9-0.95 g/cm ³ at 20°C in the following ratio, wt.%: nitrilotrimethylphosphonic acid 30; citric acid 40; surfactants 10; alcohol solution 10; lanolin 5; caustic alkali - sodium hydroxide 5. A submersible downhole container is assembled to supply the specified reagent into the well from the bottom up: they start with a plug in which an acid neutralizer - sodium hydroxide and a soluble gasket are placed, connect the plug to a perforated pipe, into which a plastic container filled with a reagent is immersed, and the container is made in the form of a cylinder with a diameter of 40-45 mm and a length of 1000 mm, having through round holes with a diameter of 8-20 mm in the amount of 1-150 pieces per 1 linear meter, and a perforated pipe is connected with a perforated filter by an intermediate coupling. Next, a submersible well container is placed under the pump, the pump is lowered into the well and the pump is put into operation.

EFFECT: increasing the efficiency of protection of downhole pumping equipment from salt and asphaltene-resin-paraffin deposits.

1 cl, 1 dwg