Burst Strength Analysis of Casing With Geometrical Imperfections

Abstract

Accurately predicting the burst strength is very important in the casing design for the oil and gas industry. In this paper, finite element analysis is performed for an infinitely long thick walled casing with geometrical imperfections subjected to internal pressure. A comparison with a series of full-scale experiments was conducted to verify the accuracy and reliability of the finite element analysis. Furthermore, three predictive equations were evaluated using the test data, and the Klever equation was concluded to give the most accurate prediction of burst strength. The finite element analysis was then extended to study the effects of major factors on the casing burst strength. Results showed that the initial eccentricity and material hardening parameter had important effects on the burst strength, while the effect of the initial ovality was small.

Bursting pressure of mild steel cylindrical vessels

“…Test data are found to be within the expected P min and P max values from equations (7) and (8). Most of the test data are close to P min values (see Table 2) Table 2 Geometric details of casings, strength properties (yield strength, s ys ; ultimate tensile strength, s ult ) of different steels and comparison of failure pressure (P min ) estimates from equation (7) with compiled test results of burst pressure (P b ) by Huang et al [7].…”

“…Huang et al [7] Outer diameter D o (mm) Fig. 3 and Table 3 are found to be higher than the P max estimates and hence Faupel's bursting pressure formula (6) gives a failure pressure lower than the test results.…”

“…Figs. 1 and 2 shows a comparison of the burst pressure estimates from Faupel's formula (6) and FEA of Huang et al [7] with test results. Test data are found to be within the expected P min and P max values from equations (7) and (8).…”

“…Huang et al [7] have compiled test data of different steels and sizes of casing to examine the adequacy of the burst pressure evaluation by performing FEA using ABAQUS. Figs.…”

Reliability Analysis of Vertical Well Casing: Comparison of API 5C3 and ISO 10400

“…Casing burst strength can be predicted based on its modes of failure which are ductile instability and brittle fracture [4]. In 1998, Parslay, Cernocky and Wink [5] have developed equations in predicting the burst strength of casing based on the ductile instability.…”