FIELD: oil and gas production.
SUBSTANCE: round-trip device comprises oil-well tubing, a pipe wrench pipe wrenchand a spider accommodating elements provided with both hardened profiled, and the smooth unhardened surfaces to interact. The invention provides designing of the hardened profiled elements on external surface patches of the oil-well tubing within interface with the oil-well tubing and spider which are provided by the elements with the smooth unhardened surfaces.
EFFECT: higher reliability of the current equipment by decreasing the probability of parting and dropping the various fragments of the round-trip device.
| Title | Year | Author | Number |
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|
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RU2479412C2 |
