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The rig was originally built to meet the demand for a more powerful mobile drilling rig, specifically a demand for rigs capable of boring up to 260 feet (79 m) deep. [2] At the time, Big Stan was claimed to be the largest portable drill rig in the United States, [3] with some estimates placing it as the largest vehicle-mounted drill rig in the ...
By this time, the oil rigs and workover rigs used to drill and complete the well will have moved off the wellbore, and the top is usually outfitted with a collection of valves called a Christmas tree or production tree. These valves regulate pressures, control flows, and allow access to the wellbore in case further completion work is needed.
Seadrill is an offshore drilling contractor providing worldwide offshore drilling services to the oil and gas industry.Its primary business is the ownership and operation of drillships, semi-submersible rigs, and jack-up rigs for operations in shallow to ultra-deep water in both benign and harsh environments.
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