FIELD: oil industry.
SUBSTANCE: invention relates to oil industry, particularly to techniques for removal of paraffin deposits from inner surface of tubing string (TS) of oil producing wells equipped with electric centrifugal and other borehole pumps without drive from earth's surface. Method involves arrangement of scraper movement inside pipe string from below upwards, cutting layer deposits from inner surface. Scraper is formed from magnetic liquid by means of directed electromagnetic field emitted by electromagnetic activators, uniformly and discretely located along whole length of tubing string. If necessary magnetic properties of formed scraper can be reduced to zero due to reverse operation of electromagnetic activators towards demagnetisation liquid scraper. Decision on necessity of scraper receives control station by readings of pressure sensor located in lower part of tubing string, and electromagnetic sensors activity in a set of each activator.
EFFECT: possibility to control of properties of scraper and trouble-free operation of oil producing wells.
4 cl, 1 dwg
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