FIELD: oil production industry, particularly for tubing string production recovery and preparation to operation.
SUBSTANCE: tubing string comprises threaded end parts, reinforced parts adjoining threaded end parts and having mounting seats for tubing string installation in mounting-and-demounting mechanism during operation thereof. Reinforced parts having lengths of 120 - 200 mm are spaced 0.3 - 0.5 mm from tubing string end. Located on reinforced part surfaces are corrugated strips, which are continuously applied on tubing string perimeter about axis thereof. Strip widths are not less than 0.5 mm. Average corrugation height W is 0.2 - 0.8 mm. Average radius R of strip valleys is 0.2 - 0.8 mm. Distance between neighboring strips along tubing string axis is not more than 20 mm.
EFFECT: increased surface life of tubing string.
5 cl, 5 dwg
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Authors
Dates
2004-11-20—Published
2003-04-01—Filed