Casing Optimization for CO2 Corrosion Resistance in the Xushen Gas Field
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摘要: 目前徐深气田钻井中普遍使用的HP13Cr-110套管各项性能虽满足要求，但成本较高。为打破套管材质单一的局面，降低套管成本，在室内对13Cr-95、HP13Cr-110和11Cr-110等3种套管的抗拉性能、硬度性能、韧性和耐CO2腐蚀性能进行了试验，并根据拟合试验所得腐蚀速率随时间的变化曲线，回归得到了各材质套管的腐蚀速率和腐蚀指数计算公式。室内试验表明，11Cr-110与HP13Cr-110套管一样具有良好的机械性能，并具有良好的耐CO2腐蚀性能，且11Cr-110套管价格低于HP13Cr-110套管。在徐深气田3口井选择11Cr-110套管进行了现场试验，结果表明，11Cr-110套管防腐效果良好，平均腐蚀速率仅为0.019 6 mm/a，满足徐深气田现场需求，且平均每口井约可节省费用55万元，能起到降本增效的作用。Abstract: Currently, HP13Cr-110 casing is extensively used in the Xushen Gas Field, its performance can meet all the needs, but the cost is higher. To avoid the use of a single material of casing and lower the cost, the tensile strengths, hardness, toughness and carbon dioxide corrosion resistance of three kinds of casing materials, including 13Cr-95, HP13Cr-110 and 11Cr-110, were tested in lab. Tests obtained the variation curve of corrosion rates with time by fitting test, and the calculation formula to determine the corrosion rates and corrosion indexes for various casing materials. Indoor testing showed that 11Cr-110 possesses good mechanical properties equivalent to HP13Cr-110, and has outstanding resistance to CO2 corrosion. Since the cost of the 11Cr-110 casing is much lower than that of HP13Cr-110 casing, the 11Cr-110 casing has been selected in cementing three wells in Xushen Gasfield. Field tests indicated that the 11Cr-110 casing has excellent anti-corrosion performances, with average corrosion rate of 0.019 6 mm/a only, which can fully meet the demand of Xushen Gas Field, and save 550 000 RMB Yuan in each well on average, playing the role of lowering cost and raising the efficiency.
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Keywords:
- casing /
- mechanical properties /
- carbon dioxide corrosion /
- Xushen Gas Field
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