FIELD: oil and gas industry.
SUBSTANCE: over spinned thread joint of the coupling (2) and casing string (1) an pulse electric current (6) flows, its amperage and duration are as during spot welding, when at contact points on projections of the rough surfaces of the coupling (8) and string (7) welding connecting spots (9) are made ensuring immobility of the joint elements for the entire service life.
EFFECT: tightness keeping of casing strings for the full service life.
4 dwg
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