| 摘要 |
A derrick is disclosed. The derrick has a bottom section and a bottom-mid section. The derrick further may include a top-mid section and a top section, wherein a crown is disposed atop the top section and a travelling block is operatively coupled to the crown. The bottom section is separable into two split sections and the two split sections are configured so as to be disposed around the top-mid section such that the two split sections encompass the top-mid section. A hydraulic cylinder and plate mechanism (“locking dog mechanism”) is disposed on bottom section, wherein the mechanism is configured to hold the top-mid section when actuated. The bottom-mid section is sized to be moved into a space defined within the bottom section after the top-mid section has been raised above the bottom section. When fully erected, the top section is affixed to and above the top-mid section, the top-mid section is affixed to and above the bottom-mid section, and the bottom-mid section is affixed to and above the bottom section. |
| 主权项 |
1. A telescoping derrick comprising:
a top section, the top section adapted to support a crown block; one or more middle sections, at least one middle section adapted to couple to and support the top section, at least one middle section adapted to be moved into a space defined within the bottom section; a bottom section, the bottom section adapted to support and couple to at least one of the one or more middle sections; and at least one pulley coupled to at least one of the one or more middle sections, the pulley adapted to pass a scoping cable coupled to the bottom section, the scoping cable adapted to, when put under tension, raise the at least one of the one or more middle sections. |
