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在酸性环境下,屈服失效准则已不适用,环境断裂是主要的失效模式.因此,有针对性地改变油套管的设计和选材,将能够减少或防止油套管失效事故的发生.在满足屈服准则设计的基础上,对T95抗硫套管和C110准抗硫套管进行断裂力学设计,根据NACE D法试验计算出材料的临界应力强度因子K_(ISSC),利用失效评估图(FAD)求出在不同条件下的T95和C110抗内压断裂强度.计算结果表明C110的抗内压断裂强度都要低于T95,对己下入C110套管的井,防止后期作业诱发裂纹至关重要.因此,酸性油气田油套管设计在满足屈服设计准则时,也要满足断裂力学设计准则,这一新的断裂力学设计方法为酸性油气田油套管设计和选材提供了重要参考价值.
In acid environment, the failure criterion of yield failure is not applicable and the environmental failure is the main failure mode. Therefore, the purpose of changing the design and selection of the oil casing will be to reduce or prevent the occurrence of oil casing failure. Based on the design of yield criterion, the fracture mechanics design of T95 sulfur-tolerant casing and C110 quasi-sulfur-tolerant casing was carried out. The critical stress intensity factor K ISSC was calculated according to NACE D test. The failure assessment diagram (FAD) The T95 and C110 internal crush strength under different conditions were calculated.The results show that the internal crush strength of C110 is lower than T95 and it is very important to prevent the cracks Therefore, the design of oil casing in acid oil and gas fields should also meet the design criteria of fracture mechanics to meet yield design criteria. This new fracture mechanics design method provides an important reference value for the design and material selection of oil casing in acid oil and gas fields.