Barretón o Kelly

Es un accesorio de la perforadora, el cual consiste

de un cuerpo compuesto por varias camisas (de

dos a cinco), insertadas unas en otras, las cuales

forman un barretón o kelly telescópico (camisa

exterior, camisas intermedias y camisa interior).

Los hay de fricción y de bloqueo mecánico; estos

últimos son los que ofrecen las mejores ventajas,

ya que con el sistema de rotación transmiten el

torque y el empuje vertical a la herramienta de

ataque. El kelly es suspendido con un malacate de

la misma perforadora. El número de secciones

telescópicas y la suma de sus longitudes

individuales determinan el alcance de perforación

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