PIPE-RACKING APPARATUS FOR OIL WELL DERRICKS OR THE LIKE

摘要

The pipe-racking apparatus disclosed in detail hereinafter is intended for use in a derrick during the drilling of oil and gas wells or the like. During trips into and out of the wellbore, drill pipe is removed or added in the form of stands made up of a plurality of short pipe sections. This pipe-racking apparatus includes a transfer arm that consists of a pantograph mechanism carrying a pipe engaging and supporting member. The transfer arm is movable on tracks whereby the stands of pipe can be moved in the vertical position between the pipe-racking area and the centerline of the wellbore.