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<p>be termed a <b>gas well</b>. Wells are created by drilling down into an <a href="page.php?w=Petroleum_reservoir">oil or gas reserve</a> and if necessary equipped with extraction devices such as <a href="page.php?w=pumpjack">pumpjack</a>s. Creating the wells can be an expensive process, costing at least hundreds of thousands of dollars, and costing much more when in difficult-to-access locations, e.g., <a href="page.php?w=oil_platform">offshore</a>. The process of modern drilling for wells first started in the 19th century but was made more efficient</p><p>
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