FIELD: mining.
SUBSTANCE: group of inventions relates to mining equipment, in particular to oil or gas obtaining, and relates to devices for connection of casing and tubing. Coupling for connection of tubing or casing pipes includes a cylindrical housing formed by upper and lower housings connected to each other through a threaded connection. On inner surface of at least one of housings there are rollers fixed on axes. Thread for connection with pipes is made on the ends of each of the housings. Rollers are arranged so that the surface of the flexible tubing string transported inside the coupling simultaneously rests on at least two rollers.
EFFECT: reduction of friction coefficient in inclined horizontal sections of wells, as well as in curvature gain intervals of wells, when performing works in tubing string and in casing strings when performing lowering and lifting operations of tools and instruments on coil tubing.
11 cl, 3 dwg
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