| 20080296063 | LOW GROUND PRESSURE AND AMPHIBIOUS CORING SYSTEM - An amphibious coring apparatus is provided for operations on ground including wetlands. A rig deck is supported above a substructure. The substructure has mobile, low ground pressure, wetland-engaging ground components. Between the deck and the substructure is an articulation interface for leveling the rig deck. A top drive is movable in a derrick for rotating a drill string. Hydraulic rams supported from the deck raise and lower the top drive, such as by a cable extending over a sheave at a top end of each ram. A pipe handler racks pipe to and from multiple tiers and a live bottom trough assists with tripping pipe. | 12-04-2008 |
