Properties of Set Aluminate Cement in 600℃ Ultra-High Temperature Xerothermic Environment
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摘要: 油页岩原位开采时井下为超高温干热环境，温度可达500℃以上，对油井水泥环的密封完整性提出了挑战。对此，评价了600℃长期干热环境下铝酸盐水泥石与加砂铝酸盐水泥石性能演变规律，分析了微观结构特征与水化产物变化。研究结果表明，铝酸盐对水泥石高温强度衰退具有一定抑制作用，经过600℃干热环境后，水泥石强度先升高后缓慢降低，这是因为硬度较高的刚玉等矿物取代硬度较低的三水铝石等矿物，水泥石以块状和粒状结构为主，结构尚可，但孔喉尺寸变大，渗透率提高。加砂铝酸盐水泥石强度低于纯铝酸盐水泥石，经过600℃干热养护后石英和刚玉含量显著升高，水泥石微观结构演化规律与纯铝酸盐水泥石基本一致，石英砂参与反应程度低，虽可部分优化水泥石孔喉结构，但其胶结性更差，水泥石内部微裂缝增多，导致渗透率升高。研究结果可为适用于油页岩等原位开采高温工况的铝酸盐水泥体系开发提供参考。Abstract: The downhole environment in in-situ mining of oil shale is ultra-high temperature and xerothermic, with temperatures above 500℃, which poses a challenge to the sealing integrity of the oil well cement sheath. To deal with this challenge, the performance evolution patterns of set aluminate cement and set sand-containing aluminate cement in a long-term xerothermic environment at 600℃ were evaluated, and the microscopic structural characteristics and changes in hydration products analyzed. The results of the research show that aluminate has a certain inhibitive effect on the decline of the high-temperature strength of the set cement. After aging in a xerothermic environment at 600℃, the strength of the set cement first increases and then slowly decreases. This is because minerals with higher hardness such as corundum replace minerals with lower hardness such as gibbsite. The set cement is mainly in the form of blocky and granular structures, and the structure is still acceptable, but the sizes of the pore throats become larger and the permeability increases. The strength of the set sand-containing aluminate cement is lower than that of the set cement of pure aluminate. After dry heat curing at 600℃, the contents of quartz and corundum increase significantly. The microscopic structural evolution pattern of the set sand-containing aluminate cement is basically the same as that of the set cement of pure aluminate. The degree with which the quartz sand participates in the reaction is low. Although it can partially optimize the pore throat structure of the set cement, its cementation property becomes poorer, and the number of microfractures inside the set cement increases, leading to an increase in permeability. The research results can provide a reference for the development of aluminate cement slurries suitable for high-temperature working conditions in in-situ mining of oil shale etc.
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Key words:
- In-situ mining /
- Set aluminate cement /
- Compressive strength /
- Permeability /
- Micro structure /
- Hydration product
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