A New Nanometer Accelerating Early Strengthen Agent for Oil Well Cement
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摘要: 针对传统油井水泥促凝剂存在的腐蚀套管、增稠及早强作用较弱等问题，根据结构设计，通过溶液法合成了一种新型纳米基促凝早强剂A-1，并对其综合性能及作用机理进行了研究探讨。实验表明，该纳米基促凝早强剂在改善水泥浆流变的同时可显著缩短中低温下水泥浆的稠化时间，明显加快水泥石强度发展，稠化时间之比可达0.33，起强度时间可缩短50%，6 h抗压强度可达净浆的5倍以上，后期强度提高率仍可达29%。此外，该纳米基促凝早强剂还可明显缩短水泥浆静胶凝过渡时间，表现出良好的防窜作用。微观分析表明，该纳米基促凝早强剂可通过成核模板效应改变水泥石微观形貌，加速水泥石水化，使水泥石更加致密，从而改善水泥石力学性能。Abstract: Accelerators used in conventional oil well cement cause casing to corrode, viscosify the cement slurry and cause the cement slurry to have weak early strength. To solve these problems, a new nanometer accelerating early strength agent A-1 is developed through solution synthesis. Study on the general properties and working mechanisms of A-1 indicate that A-1 can both improve the rheology of cement slurries and shorten the thickening time of cement slurries at medium and low temperatures, significantly accelerating the development of the strength of the set cement. The thickening time ratio reaches 0.33, the time for strength development can be shortened by 50%, the 6 h compressive strength can be 5 times higher than that of the base slurry, and the later strength improvement rate can still reach 29%. Moreover, this nanometer accelerating early strength agent can significantly shorten the transition time of the gel strength of cement slurries, showing good anti-channeling performance. Microanalysis results show that the nanometer accelerating early strength agent can alter the micromorphology of set cement through nucleation template effect, thereby accelerating the hydration of set cement, making the set cement denser and hence improving the mechanical performance of set cement.
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表 1 低温下纳米基促凝早强剂对抗压强度发展的影响
A-1/
%p/MPa 10 ℃ 20 ℃ 30 ℃ 12 h 24 h 48 h 8 h 20 h 24 h 6 h 8 h 24 h 0 0 1.9 6.8 0 5.9 6.4 0 0.5 12.2 3 0.3 5.1 13.5 0.5 13.2 15.8 4.9 5.4 24.1 5 1.2 7.5 17.6 1.5 17.6 22.9 6.5 7.9 32.1 
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表 2 中低温下纳米基促凝早强剂对 水泥石抗压强度发展的影响
T/
℃A-1/
%起强度时间/
minp/MPa 6 h 8 h 24 h 30 0.0 296 0.4 1.1 10.9 30 4.0 115 4.0 6.9 18.4 50 0.0 286 2.3 8.0 23.8 50 2.5 142 11.9 16.7 28.1 80 0.0 271 2.2 7.8 24.3 80 2.0 132 12.0 17.0 29.6
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表 3 加入纳米基促凝早强剂A-1对水泥石长期强度的影响
A-1/
%p24 h/MPa p7 d/MPa 40 ℃ 80 ℃ 40 ℃ 80 ℃ 0.0 19.6 26.3 43.0 40.3 2.0 26.3 33.5 44.3 47.6 3.0 32.6 38.6 45.7 51.3 4.0 35.3 39.6 46.3 52.0
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表 4 纳米基促凝早强剂对水泥浆流变性能的影响
A-1/
%T/
℃φ3 φ6 φ100 φ200 φ300 n K/
Pa·sn0 20 23 28 61 73 86 0.31 6.25 2.5 20 20 25 47 61 73 0.40 3.06 3.5 20 15 20 38 50 63 0.46 1.83 5.0 20 16 21 37 50 62 0.47 1.69
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表 5 不同温度下水泥浆静胶凝过渡时间的评价结果
T/
℃A-1/
%静胶凝强度
过渡时间/minT/
℃A-1/
%静胶凝强度
过渡时间/min30 0 106 50 2.5 5 30 2.5 26 80 0.0 20 30 4.0 17 80 1.5 15 50 0 19 80 2.5 12 50 1.5 12
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