Conventional land-based drilling rigs comprise up to 40 trucks of equipment. Costs can reach $950,000 to take down and set up again in a different location (slot) no matter how close it is. When several wells must to be drilled close by each other, the cost per well can be cut dramatically by moving the drilling rig from slot to slot. Walking rigs were developed for this reason. They can move up to 150 ft at up to 100 ft/hr, rotated, and located over a series of wells as required...
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