Equations calculate collapse pressures for casing strings

Collapse-resistance values for special casing that undergoes external deformation can be calculated with new pressure equations developed by the Southwest Petroleum Institute, China.These equations can be used for high-collapse resistance casing, non-API standard pipe, and casing with abnormal wall thickness.Up to this point, the industry has not developed standard calculations for specially manufactured casing that uses a special wall thickness to overcome high collapse regimes. According to the theory of elasticity and plasticity, an equation for the estimation of the collapse resistance for non-API casing has been obtained and modified later in consideration of casing manufacturing imp...

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