TREATMENT METHOD OF BOTTOMHOLE ZONE Russian patent published in 2014 - IPC E21B37/06 

FIELD: oil and gas industry.

SUBSTANCE: invention relates to the oil and gas industry and can be used for well cleanout. At a wellhead a discharge line is mounted so that it passes through a heat exchanging device tied up with a mobile steam plant and road-tankers with a solvent and a process fluid, which are tied up with the pumping unit. The mobile steam plant and the pumping unit are started simultaneously; the production string and tubing sting run through it are filled with the solvent heated up at the heat exchanging device up to 75-80°C. The solvent temperature at the output from the heat exchanging device is maintained by changes in the capacity of the pump feeding the solvent from the road-tanker at a permanent temperature and consumption of steam generated by the mobile steam plant at its output. Filling with the solvent is made with simultaneous displacement of the well fluid to the oil pipeline. When filling with the solvent is over, steam delivery is stopped to the heat exchanging device and the process fluid is delivered by the pumping unit to the discharge line in a volume of 1.0 m³ and the solvent is pumped to the well. The well is withheld for 4 hours, thereafter a borehole pump is started in a circulation mode, the well operation is started and the used solvent is pumped out to the oil pipeline.

EFFECT: improved efficiency and reliability of treatment, reduced duration of treatment and improved production standards.

1 dwg