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通过对高温条件下高钢级套管进行室内试验,得到了Q125、V140和V150套管屈服和抗拉强度值,并引入强度折减系数,回归出高温条件下相应强度折减系数计算公式.为了满足油田实际设计需要,给出了高钢级套管在150℃和200℃下的统一强度折减系数推荐值,并被中国石油天然气行业标准采纳,推广应用于高温下套管柱设计.根据试验结果及回归公式,对中国西部某深井套管柱进行了设计校核和安全评价.计算结果表明:本文试验结果和回归公式具有很好的通用性,可以满足现场工程需求;高钢级套管屈服强度和抗拉强度随温度增加而显著降低,且屈服强度降低幅度要大于抗拉强度,建议在高温井套管柱设计过程中要考虑温度对管材性能降低的影响.
The yield and tensile strength of Q125, V140 and V150 casing were obtained through laboratory tests of high-grade steel casing under high temperature. The strength reduction factor was introduced and the formula for calculating the corresponding strength reduction factor under high temperature was derived. In order to meet the actual design requirements of the oilfield, the recommended values of the uniform strength reduction coefficient of high-grade steel casing at 150 ℃ and 200 ℃ are given and adopted by China’s oil and gas industry standards, which are popularized and applied to the casing string design at high temperature. According to the test results and the regression formula, the design verification and safety evaluation of a deep well casing string in western China are carried out. The calculation results show that the test results and regression formulas in this paper have good versatility and can meet the needs of on-site engineering. The yield strength and tensile strength of the casing decrease obviously with the increase of temperature, and the yield strength decrease more than the tensile strength. It is suggested that the influence of temperature on the performance of the casing should be considered in the design of casing string of high temperature well.