Analysis of Casing Strength of Fracturing Sand Control in Deep Well Based on CAE Simulation Technology

It used to be held that fracturing sand control construction would severely affect the strength and duration of casing in deep well. Based on 5 inch and 7inch casings, the article intends to conduct modeling and analysis, by means of the finite element method, of a multi-tube model of casing of different steel grades and a combination of different perforation parameters, under different environmental conditions (different internal and external pressure). The results show that under the same perforation parameters, the equivalent stress within the casing increases with the external pressure and the changes linearly. Equivalent stress within the casing decreases drastically with the increase of internal pressure. When the internal pressure is greater than the external pressure, the equivalent stress of the casing tends to slow down. Stress condition in the casing perforation improves when internal pressure is applied in the casing. The result shows that fracturing sand control construction improves the stress condition of the casing rather than affect the strength and duration of casing.