Well Construction - gekengineering.com

well Construction Basics How Wells are Designed & Constructed Minimum Expectations and Best Practices Assessing Completion Reliability and Risk Key Performance Indicators Tubular Design and Downhole Equipment casing is run to: prevent fill (formation fragments) from entering the wellbore protect fresh water zones from other fluids isolate zones - prevent or channel flow make drilling possible: mud weight has to stay in the window between a minimum that will control the pore pressure (and formation heaving) and a maximum that will not fracture the formation. casing is also sometimes used where it is not needed.

This is one type of a well head flange. This unit slips on the top of the casing string and is welded to give a seal. The port in the side gives access to the

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  Construction, Well, Casing, Well construction

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