Based on conventional casing collapsing strength computational formula of American Petroleum Institute,combined with gas drainage well casing practice of Guqiao coalmine,Huainan Mining Group,carried out theoretical computation first,then correction based on correction factor obtained from large numbers of test,thereby practical casing collapsing strength acquired.

Influence of formation void on the collapsing strength of casing;

Finite element ANSYS analysis method of bending casing collapsing strength

Collapsing Strength Analysis of Extra-heavy Wall Casing Under Nonuniform Loads

Non-uniform loading can reduce the collapse resistance of worn casings.

The effects of outer diameter/wall thickness,material yield strength,ovality,eccentricity and residual stress on the casing collapse resistance are analyzed in this paper.

Casing collapse resistance is a very active research field worldwide.

Method study on reliability analysis of casing collapse strength;

But the key factor of calculating casing collapse strength is wall thickness of expandable casing, which is concerned by the petroleum engineers.

Then the collapse strength of the perforated casing under non-uniform load is numerically simulated.

The paper uses the worn casing collapse strength equation to calculate the remaining strength.