intermediate casing
drilling technology
Quick Summary
Intermediate casing is steel pipe inserted into an oil well during the drilling process to prevent fluid transfer between the borehole and surrounding formations. As drilling progresses, the borehole diameter decreases below each string of casing. Deep wells may utilize up to five progressively smaller intermediate casing strings. After drilling, casing is cemented to the borehole wall to further isolate formations. Production tubing is then inserted within the casing to bring oil or gas to the surface.12
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