METHOD OF PREVENTING FORMATION OF ASPHALTENE, RESINOUS PARAFFIN DEPOSITS (ARPD) IN LIFT PIPES DURING GAS-LIFT OPERATION OF OIL WELLS Russian patent published in 2021 - IPC E21B37/00 

FIELD: oil and gas industry.

SUBSTANCE: invention relates to oil industry, in particular to methods of preventing deposit formation on oil-producing equipment of paraffin and other components of hydrocarbon material, for example, asphaltene-resin-paraffin compositions during its production and transportation. Proposed method comprises pumping working fluid into annular space of the well. Initial data are obtained on component compositions of formation fluid and associated petroleum gas, which is used as a working agent, then it is purified from hydrogen sulphide and carbon dioxide, then, purified associated petroleum gas is pumped without changing its hydrocarbon composition and temperature of oil saturation with paraffin is determined and its formation depth in the well taking into account the oil component composition change during pumping of associated petroleum gas, further, the ratio of light and heavy fractions of injected associated petroleum gas is changed and the temperature of oil saturation with paraffin and the depth of its formation for a given ratio of light and heavy fractions are determined. Then the factors are compared and the optimal version of the required amount of working agent consumption is selected at the lowest temperature of oil saturation with paraffin.

EFFECT: improving operating efficiency of gas lift wells complicated by asphaltene-resin-paraffin deposits, increasing overhaul period of their operation.

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