Study on the Performance of a New Low Temperature Early Strength Agent for Well Cement Slurries
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摘要: 针对浅层低温导致水泥浆强度发展缓慢的问题，通过分散-共沉淀法制备了一种新型低温固井早强剂ES-22,并对制备早强剂的粒径及微观结构进行分析。比较了在低温条件下，新型早强剂ES-22与其他无机早强剂对水泥浆强度发展的影响，并研究了新型早强剂不同加量对水泥浆性能的影响规律。研究表明，制备的早强剂ES-22粒径主要集中在15～25 μm之间。与其他早强剂相比，新型早强剂ES-22对水泥石早期抗压强度提升最大，且制备的早强剂在低温环境下对水泥石力学性能提升更大。早强剂掺入水泥浆中对水泥浆流变性影响不大，稠化时间无大幅度缩短，失水量降低。在20 ℃下养护24 h后，含4%早强剂水泥石的抗压强度和抗折强度比空白水泥石分别提高了204%和136%。新型早强剂在固井水泥浆中有很好的应用效果。Abstract: A new low temperature early-strength agent ES-22 has been developed through dispersion-coprecipitation method to solve the slow strength development of cement slurries in shallow and low temperature well cementing. In laboratory experiment, the particle size distribution and micro-structure of ES-22 were analyzed, the effects of ES-22 and other inorganic early-strength agents on the strength development of cement slurries at low temperatures were compared. The effects of ES-22 of different concentrations on the properties of cement slurries were also studied. It was found that ES-22 has particle sizes distributed between 15 μm and 25 μm. Compared with other early-strength agents, ES-22 is the best early-strength agent for the development of the early compressive strength of set cement. At low temperatures, ES-22 has even greater contribution to the development of the mechanical property of the set cement. ES-22 has little, if any, effects on the rheology of the cement slurry, the thickening time of the cement slurry becomes only a little short, and the volume of filter loss is reduced. In laboratory experiment, a set cement containing 4% ES-22 had its compressive strength and flexural strength increased by 204% and 136% respectively over the compressive strength and flexural strength of the blank set cement after aging at 20 ℃ for 24 hours. These results indicate that the early-strength agent ES-22 performs very well in oil well cement slurries.
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Key words:
- Cement slurry /
- Low temperature /
- Well cementing /
- Early-strength agent /
- Compressive strength
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早强剂 加量/% 粒径 抗压强度提高率/% 水化硅酸钙I 2 20 nm 46 聚羧酸/C—S—H 2 370 nm 40 水化硅酸钙II 3 1 μm 160 ES-22 2/3/4 21.59 μm 67/195/204 
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表 2 不同早强剂加量下的水泥浆流变性对比
早强剂/% φ300 φ200 φ100 φ6 φ3 游离液/% 0 202 142 74 4 3 0.2 2 218 156 79 6 4 0 4 235 172 88 9 6 0 6 252 191 101 14 11 0
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