高压、超高压油气井装备抗内压强度设计计算分析*

为解决传统计算公式与方法已几乎无法满足目前对高压、超高压油气井装备强度设计的需求，利用理论分析方法，对不同抗内压强度计算公式进行详细分析，引入压力容器行业高压、超高压的计算公式与方法，并对某高温高压井抗内压强度进行分析，提出适用于超高压油气井的油套管抗内压强度计算公式。研究结果表明:不同抗内压强度公式的基本思想与设计准则不同，在使用时应注意限制条件，现有的抗内压强度计算公式不适用于高压、超高压油气井，材料性能不能充分利用且存在一定安全隐患；对超过100 MPa的油气井，可以采用弹塑性理念计算抗内压强度，对于油套管可以减小强度等级同时增加壁厚来满足抗内压强度要求。研究结果对高压、超高压油气井装备抗内压强度设计具有一定参考价值。

Calculation and analysis on internal pressure strength design forequipment of high pressure and ultra-high pressure oil and gas wells

To address the need for strength design for high pressure and ultra-high pressure oil and gas wells that traditional calculation formulas and methods can no longer meet.Different formulas for calculating the internal pressure strength were analyzed in detail by theoretical analysis.The calculation formulas and methods of high pressure and ultra-high pressure in the pressure vessel industry were introduced,and the internal pressure strength of a hightemperature and highpressure well was analyzed.A formula for calculating the internal pressure strength of oil casing in the ultra-high pressure oil and gas wells was proposed.The results showed that the basic idea and design criteria of different internal pressure strength formulas were different,and the conditions should be paid attention to when using them.The existing internal pressure strength calculation formulas were not applicable to the highpressure and ultra-high pressure oil and gas wells,and the material properties could not be fully utilized and there were certain potential safety hazards.For the oil and gas wells over 100 MPa,the elastic-plastic concept was used to calculate the internal pressure strength.For the oil casing,therequirements of internal pressure strength could be met by reducing the strength grade and increasing the wall thickness.The research has certain reference value for the design of internal pressure strength of equipmentin the high pressure and ultra-high pressure oil and gas wells.