METHOD FOR INHIBITION OF A WELL WITH A SUCKER ROD PUMPING UNIT IN CONDITIONS COMPLICATED BY SCALE DEPOSITION IN DOWNHOLE PUMPING EQUIPMENT Russian patent published in 2022 - IPC E21B37/06 

FIELD: oil and gas industry.

SUBSTANCE: invention relates to the oil and gas industry, namely to the operation of wells by rod well pumping units in conditions complicated by salt deposition in deep-pumping equipment. The method includes well shut-in, injection of a solution of a scale inhibitor into the well along a tubing string run to the top of the formation, creating a seal, squeezing the chemical into the formation with a spacer fluid, rigging down of equipment, running of the downhole pumping equipment of a sucker rod well pumping unit, well completion and well fluid extraction. The reservoir injectivity is preliminarily determined, with a well injectivity of less than 250 m³/day at an injection pressure of 70-80 atm, after pumping a scale inhibitor solution, the calculated volume of a hydrophobic emulsion solution is pumped with the addition of a scale inhibitor providing an seal, and with a well injectivity of 250 m³/day or more at an injection pressure of 70-80 atm the inhibitor is injected in portions of first 50%, then 30%, then 20% of the total volume of injection of the inhibitor with alternating injection of pills of hydrophobic emulsion solution between batches of the inhibitor. The water solution of a surfactant composition with added scale inhibitor is injected into the formation. After installation of the downhole sucker rod pump, the oscillation frequency of the pump drive balancer is reduced from the initial frequency by 2-3 times using a variable frequency electric drive, the well is put commissioned and completed for 16-24 hours, then the variable frequency electric drive is turned off and operation continues with the initial oscillation frequency of the pump drive balancer with periodic sampling to monitor the inhibitor production. A hydrophobic emulsion based on petroleum and petroleum distillate with a density of 1010-1070 kg/m³ and a viscosity of 120-200 MPa·s is used.

EFFECT: invention increases the efficiency of the inhibitor increases, expands the range of technological capabilities of well inhibition.

2 cl, 2 dwg.