| 摘要 |
The present disclosure sets forth a portable workover rig which is formed of a base which can be adjusted through two degrees of freedom to position a rectangular framework leveled with respect to gravity to thereby support derrick sections. The base supports the derrick sections within a derrick support mechanism which is an upstanding axially hollow structure having a side door. Each section of the derrick is inserted into the side door and can be selectively raised by a hydraulic mechanism. Each derrick section is raised to receive another derrick section to extend the derrick from the bottom up to avoid climbing. A crown assembly is placed on the derrick to adjustably position appropriate sheaves for engaging load lines extending from the well head area up to the crown and back to the well head to carry out workover of a producing well. Assembly of the derrick section by section is done from the bottom to avoid climbing the derrick. Guy wires are affixed to assure a vertical derrick. Assembly and disassembly is by section so that the derrick system is then portable.
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