| 摘要 |
<p>A method and apparatus for erecting a vertical mast on a drill platform in the absence of a functioning drawworks. A guide section is first placed on the platform. The guide section has one vertical side for slidably receiving the mast top section, mast bottom section, and one or more mast intermediate sections, all of which, have approximately the same horizontal cross section. The bottom of top section is pivotally coupled to the top of intermediate section. Top section and intermediate section are then raised by a winch which is mounted on guide section until intermediate section is vertically disposed and slidably engaged by guide section. Top section and intermediate section are then rigidly coupled. The process is repeated until other intermediate sections, if any, and bottom section are vertically disposed on platform.</p> |
