Abstract
Perforated casing eyehole stress concentration and sanding and compaction are the main reasons of casing abnormal damage during the exploitation. To understand the impact of reservoir sanding on perforated casing strength, fracture mechanics is applied to analyze the stress concentration of casing caused by perforating, while rock mechanics is applied to analyze the load of perforated casing of reservoir sanding limited bailed section, and on this basis, the impact of reservoir sanding on perforated casing strength is analyzed by the three-dimensional finite element model building. The analysis results show that the finite element solution and the theoretical solution of stresses of the perforated casing of reservoir sanding limited bailed section can be verified with each other. Under the same condition, the theoretical solution is bigger than the finite element solution, this is mainly due to the perforated casing additional bending stress effect is considered in the fracture mechanics theoretical analysis. It is conservative to estimate the perforated casing safety by finite element solution, while the theoretical solution is economical.
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