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1. 1.1. Types of Casing ‫التعريف‬
The number and size of the casing will vary with each well, but the
typical casing arrangement consists of four strings: conductor, surface,
intermediate, and production casing. While the casing program for
different wells vary, each string of casing serves a specific purposeand
are important to the completion of the well.
‫وضائف‬ Functionsof Casing
.
1- Isolate troublesome zones(high-pressuredzones,weakandfractured
formations,unconsolidatedformations,
and sloughingshales) andtoallow
drillingtothe total depth.
2- Preventthe hole fromcavingin
3- To isolate porousmediawithdifferentfluid/pressureregimes
fromcontaminatingthe payzone
4- To keepthe hole openandto provide asupportfor weak,or
fracture
5- Preventnear-surface freshwaterzonesfrom
contaminationwithdrillingmuddformations