Effects of Pressure and Temperature on Well Cement Degradation by Supercritical CO 2
Effects of Pressure and Temperature on Well Cement Degradation by Supercritical CO 2
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压力和温度对超临界CO 2 降解井水泥的影响
DOI：
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发表时间：
2010
期刊：
影响因子：
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通讯作者：
S. Irawan
中科院分区：
文献类型：
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作者：
A. Sauki;S. Irawan
本研究的总体目标是研究不同温度和压力条件下超临界CO2对油井水泥的物理和化学影响。比较了CO2饱和盐水和湿超临界CO2两种暴露条件下的侵蚀力差异。本发明所用水泥类型为纯G级水泥，按API推荐操作规程10B-2使用恒速搅拌机配制而成。利用固化室和水泥高压釜进行了水泥浆的养护和CO2暴露试验。在不同的温度和压力条件下，在不同的暴露时间下，测定了水泥抗CO2侵蚀蚀变的测量和演化。利用背散射扫描电子显微镜(BSE-SEM)、能量色散X射线能谱(EDX)、X射线衍射仪(X射线衍射仪)和抗压强度测试仪对测试结果进行了分析和研究。在高温(120℃)时，水泥的强度比低温(40℃)时更快。压力也是如此，压力越大，强度损失越快，140bar，而压力越低，强度越低，105bar。与湿的超临界二氧化碳相比，二氧化碳饱和盐水的强度降低更快。指标术语-超临界二氧化碳、卤水、蚀变、抗压强度、养护。
The overall objective of this study was to investigate the physical and chemical effects of supercritical CO2 attack on well cement at different temperature and pressure condition. The dissimilarity of attack was compared in twoexposure conditions i.e. CO2-saturated brine and wet supercritical CO2. Type of cement used for this invent was neat cement, Class G and was prepared according to API recommended practice 10B-2 by using Constant Speed Mixer. Curing of cement slurry and CO2 exposure test were done by using Curing Chamber and Cement Autoclave. Measurement and evolution of cement alteration against CO2 attack was determined under various temperatures and pressure condition at different exposure duration. Results from BackScattered Electron of Scanning Electron Microscopy (BSE-SEM), Energydispersive X-Ray Spectroscopy (EDX), X-Ray Diffraction (XRD) and compressive strength tester was analysed and studied. At high temperature, 120C, cement will lose its strength faster than lower temperature, 40C. Same goes to pressure, the strength will lose faster in higher pressure, 140 bar as compared to lower pressure, 105 bar. Faster reduction in strength was found in CO2saturated brine exposure compared to wet supercritical CO2. Index Terms – Supercritical CO2, brine, alteration, compressive strength, curing.