METHOD OF CLEANING FROM PARAFFIN DEPOSITS IN WELL Russian patent published in 2020 - IPC E21B37/00 

FIELD: oil and gas industry.

SUBSTANCE: invention relates to oil and gas industry and can be used in cleaning oil and gas well and downhole equipment from paraffin and / or similar deposits. Method comprises lowering a process string with a valve and a flow diverting device on the end into the well with the tubing and the deep-well pump in the interval of paraffin deposition on the walls of the pipes, pumping by heat carrier process string till liquid heating inside tubing at the wellhead to temperature not lower than melting temperature of paraffins. Process string is lowered from outside the tubing after pump operation is stopped. Flow deflecting device is installed below the valve and is made in form of a pipe plugged from below with radial unidirectional holes, which diameter and height arrangement are selected proceeding from provision of uniform steam flow in height. Valve opening effort is selected to ensure superheated liquid pumping of heat carrier through the process string and steam injection through the branch pipe to the tubing wall. After provision of steam-liquid mixture discharge from annulus and fluid heating inside tubing string at the wellhead to temperature not lower than paraffin melting temperature, the pump is started to work, and annulus is filled with liquid with temperature not lower than melting point of paraffins in volume of not less than internal volume of well from mouth to inlet of pump and capacity of not less than capacity of pump for lifting paraffin deposits from tubing to surface.

EFFECT: reduced power consumption for heating due to operation in a nonworking well, higher efficiency of destruction of external deposits on the surface of flow tubes due to their treatment with steam-gas jets.

1 cl, 1 dwg