WELL DECOLMATATION DEVICE Russian patent published in 2020 - IPC E21B37/00 B08B9/32 

FIELD: oil, gas and coke-chemical industries.

SUBSTANCE: invention relates to oil and gas industry and is intended for recovery of productive formation permeability in bottomhole zone of the well after hydraulic fracturing of the formation. Proposed device comprises housing with annular projection on outer side with first nozzle head fitted thereon. Nozzle head has shape of hollow cylinder and is equipped with throttle opening, with inclination to axis of rotation of housing and displacement relative to its axis. Second nozzle head is located under annular ledge and provided with reflector in form of sector on outer side. Lower end of the body is equipped with a lock nut, on the outer side of which there is a breaker in the form of a sector. Throttles of the nozzle heads are oriented in opposite directions.

EFFECT: technical result is improved quality of well cleaning due to pulsed sign-changing action on sediment layer, at neutralization of reactive torque from rotation to flexible pipe string.

1 cl, 6 dwg