FIELD: oil and gas industry.
SUBSTANCE: during this method implementation reagent is supplied to pump cavity through check three-position valve installed above vent hole of pump. Delivery and accumulation of reagent is performed in tubing through flexible reinforced pipe lowered from wellhead for the period of treatment or previously installed fixed inside tubing string or along inter-tube space of well. Accumulated volume of reagent above the pump and check valve is forced in the pump through check three-position valve by generation of required pressure differential in tubing string from wellhead for check three-position valve opening in backward direction.
EFFECT: improving efficiency of pump flushing method.
2 cl, 1 dwg
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