METHOD OF DESTRUCTION OF HYDRATE-PARAFFIN AND MECHANICAL DEPOSITS Russian patent published in 2020 - IPC E21B37/00 

FIELD: oil, gas and coke-chemical industries.

SUBSTANCE: invention relates to the field of overhaul and current repair of oil and gas wells. Method comprises insertion of flexible pipe into tubular annulus, lowering flexible tube between inner walls of casing string, wherein the flexible pipe on the surface is pre-connected to the high pressure pump, the heat carrier is supplied to the annular space of the well, the return flow of the heat carrier is discharged into the granary. After passage of the lower boundary of the hydrate paraffin deposits by the flexible pipe, the movement is stopped until the return flow of the heat carrier reaches the specified temperature, the downhole pump is switched on, the well is switched to the common direct circulation mode by pumping the heat carrier from the annular space to the flow column, and the heat carrier is discharged into the granary through the previously opened elevator gate valve.

EFFECT: increased efficiency and cleaning rate of inter-pipe space from hydratoparaffin or mechanical deposits, flushing of inner space of flow string from sediments.

5 cl, 3 dwg