Collapsing Pressure of Casing Located at the Bend Part of Casing-Exit Sidetracking Well
Depending on the mechanical characteristics of casing located at the bending part of sidetrack horizontal well, the calculation model of casing collapsing strength under the effect of bending load is established, and corresponding theoretical formulae is derived. During the process of deducing formulas, the influence of bending load on the casing section out of roundness is ignored, which made the calculation formula benefits intuition and practicality comparing to the T.Tamano formula. The result of this paper is verified through the simulation value and laboratory test of casing used in the Jilin oilfield. It shows that the formula of this paper can meet the engineering commands; the axial load is significant to affect casing collapsing strength, and in the actual production process should be strictly controlled.
Z. L. Tian et al., "Collapsing Pressure of Casing Located at the Bend Part of Casing-Exit Sidetracking Well", Advanced Materials Research, Vols. 383-390, pp. 1884-1890, 2012