FIELD: oil production, particularly to create optimal thermal regime in producing oil wells to prevent paraffin-hydrate deposits inside wells.
SUBSTANCE: method involves lowering cable with heating unit in tubing string to depth where well fluid temperature exceeds paraffin-hydrate crystallization initiation temperature, wherein the heating unit includes at least two coaxial parts, namely inner and outer ones; linking heating unit of the cable to controllable power source; providing specific power generation by heating unit along tubing string. One part of heating unit has uniform electric resistance along the full length thereof. At least one section of another heating unit part has electric resistance distributed along length thereof in direct proportion to specific power of elementary heating unit section at depth thereof. Distribution of specific power generated by heating unit along tubing string is determined from analytic formula.
EFFECT: decreased power inputs and increased reliability.
6 dwg
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