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<p>valve to prevent the increased gas pressure from forcing sand into the casing, enabling them to reach a depth of 445 ft, and past the 285 ft thick quicksand formation.  At a depth of 645 ft, they adopted eighteen-hour shifts for continuous operations, drilling during the day, and keeping circulation going at night, to prevent a gas <a href="page.php?w=blowout_%28well_drilling%29">blowout</a>.  In early December, they hit a pocket of coarse water sand, when they adopted another innovation, mixing mud into the water which prevented the "heavier"</p><p>
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