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<p>Modern drilling techniques utilize long drill shafts, producing holes much narrower and deeper than could be produced by digging.</p>

<p>Well drilling can be done either manually or mechanically and the nature of required equipment varies from extremely simple and cheap to very sophisticated.</p>

<p>In many jurisdictions, drilling activities are regulated to protect groundwater sources from <a href="page.php?w=Pollution">contamination</a>.</p>

<p><b>Managed Pressure Drilling</b> (MPD) is defined by the International Association of Drilling</p><p>
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