Casing must have certain properties in order to achieve its functions in a well. The most important performance properties of casing include its rated values for axial tension, burst pressure, and collapse pressure.
Axial tension loading
Which results from the weight of the casing string suspended below the joint of interest.
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Body yield strength
Which is the tensional force required to cause the pipe body to exceed its elastic limit.
Joint strength
Which is the minimal tensional force required to cause joint failure.
Burst pressure rating
Which is the calculated minimum internal pressure that will cause the casing to rupture in the absence of external pressure and axial loading.
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Collapse pressure rating
Which is the minimum external pressure that will cause the casing walls to collapse in the absence of internal pressure and axial loading.
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Biaxial Design
Which is The combination of stresses due to the weight of the casing and external pressures.
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Safety Factors
Exact values of loading are difficult to predict through out the life of the well. Below you will find the usable safety factor while running casing design.
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