METHOD OF CLEANING WELL FROM SAND PLUG AND JET GUN NOZZLE FOR ITS IMPLEMENTATION Russian patent published in 2020 - IPC E21B37/00 E21B21/00 

FIELD: oil and gas industry.

SUBSTANCE: group of inventions relates to oil and gas industry, namely, to cleaning and flushing of well from sand plug. Method comprises lowering a housing with a jet port and end cutting tool to the well on the tubing string to a sand plug roof, injection of washing solution in them, destruction of the sand plug by flushing end tool and flushing out of the sand plug with jets, extraction of the flushing pipes string from the well. Before lowering hollow cylindrical body is equipped with taper constriction playing the role of jetting channel. After lowering of housing into well upper, softer layer of sand plug is flushed at lower rate of jet of flushing liquid directed towards plug, and low, denser layers – with higher due to discharge from mouth of jet nozzle with cone section, made with possibility of interaction with tapered narrowing of housing, and central water hole through which flushing liquid is pumped. Jet nozzle comprises cylindrical case with cavity, face cutting tool and thrust ring for valve. Thrust ring is equipped with water jet channel for hydraulic connection of body cavity with well space and is made in the form of conical narrowing of inner cavity acting as jet port. Valve is made in the form of jet nozzle with conical section for tapering narrowing of housing and central water hole.

EFFECT: reduced consumption of liquid due to change of operation mode, higher efficiency of cleaning.

2 cl, 1 dwg