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室内确定了一种适用于热采井(井深约2000 m,蒸汽驱时温度为350℃)的抗高温低密度水泥浆体系。该水泥浆体系密度在1.40—1.60 g/cm~3之间可调;失水量低;低温(40℃)养护后,早期强度大于15 MPa,远高于一般的低密度水泥浆体系;高温(350℃)养护后,水泥石强度仍大于10MPa,体现了其优异的抗高温强度衰退性能。同时对该体系的降失水、调凝、增加早期强度和抗高温的作用机理作了初步的探讨。
The laboratory has determined a high temperature and low density cement slurry system suitable for thermal recovery wells (about 2000 m in depth and 350 ° C in steam flooding). The density of the cement slurry system is adjustable between 1.40 and 1.60 g / cm ~ 3; the water loss is low; the early strength is higher than 15 MPa after curing at low temperature (40 ° C), which is much higher than the common low density cement slurry system; 350 ℃) After curing, the strength of cement stone is still greater than 10MPa, reflecting its excellent resistance to high temperature strength decay performance. At the same time, the mechanism of lowering water loss, adjusting coagulation, increasing early strength and high temperature resistance of the system was also discussed.