Rotary traction short section

Abstract

The invention discloses a rotary traction short section, and belongs to the field of drilling engineering equipment. The rotary traction short section comprises centralizers and a mandrel. Two ends ofthe centralizers are correspondingly and fixedly connected with one ends of two centralizer bushings, the other ends of the two centralizer bushings are correspondingly and fixedly connected with themandrel, and the centralizer bushings are connected with the mandrel through splines. The lower part of the mandrel is in threaded connection with a lower joint; the lower part of the lower joint isin threaded connection with a drill string; radial bosses are correspondingly arranged at the left ends and the right ends of the centralizer bushings; and the centralizer bushings are divided into upper parts and lower parts along an axial symmetrical surface, and the upper parts and the lower parts are correspondingly connected with two centralizers. According to the rotary traction short section, the assembling relation between a conventional centralizer and the mandrel can be changed, sliding friction resistance between the centralizers and the well wall is changed into rotating friction resistance, and the effect of reducing friction resistance can be achieved; and the eccentric centralizer can be used for unclamping during clamping and burying.

Description

technical field [0001] The invention belongs to the field of drilling engineering equipment, in particular to a rotary traction nipple. Background technique [0002] In the field of drilling engineering applications, centralizers and drill strings are often used. Centralizers, also known as stabilizers, are petroleum downhole tools that are connected to the oil drill string or as part of the bottom hole assembly. It can be divided into two categories: drill string centralizer and bottom hole assembly. Its functions include: controlling the wellbore trajectory, playing the role of centralizer and fulcrum in the drill string, and controlling the wellbore trajectory and curvature together with other components of the drill string ; Wellbore trimming, when the centralizer is drilling with the drill string, it can expand the diameter of the wellbore or bend it to a certain extent, and repair the irregularities of the wellbore wall to improve the quality of the wellbore; String v...

AI Technical Summary

Problems solved by technology

[0004] In view of the problems existing in the background technology, the object of the present invention is to provide a rotary traction nipple to solve the problem that the drill pipe is stuck in the hole during the drilling operation

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