SELF-ELEVATING MAST EMPLOYING DRAW WORKS

摘要

A system comprising a support structure having a plurality of vertically extending members arranged to define a mast channel, the support structure attached to a platform having a rig floor and the support structure positioned above an opening in the rig floor; a first mast section that is attached to the support structure; a second mast section that is attached to the support structure and the first mast section; and a third mast section; wherein the system has a first arrangement in which the third mast section is located below the rig floor in a vertical position and is vertically spaced from the second mast; and wherein the system has a second arrangement in which the third mast section is attached to the second mast section and at least a portion of the third mast extends within the opening of the rig floor.

主权项

1. An apparatus comprising;
a support structure having a plurality of vertically extending members arranged to define an inner perimeter of a mast channel, the support structure attached to a platform having a platform floor and the support structure positioned above an opening in the platform floor; a first mast section configured to be attached, using a first plurality of holding pins located on the support structure, to the support structure, at least a portion of the first mast section located within the mast channel, the first mast section having a lower first mast portion and an upper first mast portion, the first mast section configured to be attached to a pulley system;
wherein the pulley system comprises
a hoist attached to the platform;a line attached to the hoist and operably coupled to a pulley, the pulley attached to the upper first mast portion; anda hook coupled to the line, the line and the hook located within the mast channel; and a second mast section configured to be attached, using a second plurality of holding pins located on the support structure, to the support structure; wherein the second mast section is configured to be raised, using the pulley system, from a first location below the platform to a second location directly below the first mast section; wherein an upper second mast portion of the second mast section is configured to be attached to the lower first mast portion; wherein the first mast section is configured to detach from the support structure while the first mast section is supported by an overhead source located above the first support structure and connected to the first mast section; wherein the second mast section is configured to detach from the support structure while the second mast section is supported by the overhead source; and wherein the first mast section and the second mast section are configured to be raised by the overhead source to a third location where the second mast section can attach to the support structure using the first plurality of holding pins.