【摘要】 80℃水浴养护环境下,研究了不同掺量富镁矿渣对G级油井水泥浆体膨胀性能及其他基本性能的影响,考察了40%富镁矿渣掺量下水泥浆体的工程性能,同时研究了富镁矿渣的水化机理。实验结果表明,掺加富镁矿渣的水泥浆体具有微膨胀性能,其中掺40%富镁矿渣的水泥浆1d线膨胀率为0.0035%,28d线膨胀率为0.0255%;富镁矿渣掺量对水泥浆体凝结时间、流动度、密度影响不大;水化放热量和水泥石早期强度(3d前)均随富镁矿渣掺量的增加而降低,而后期强度(28d后)逐渐升高并高于净浆水泥石;硬化体中Ca(OH)2含量随富镁矿渣掺量增加和养护龄期的延长而降低;40%富镁矿渣掺量下,浆体各项工程性能基本满足固井施工基本技术要求。更多还原

【Abstract】 At the water-bath curing temperature of 80℃,effects of magnesium-rich slag on expansive property and other basic properties of class G oil well cement slurry were studied,and the engineering properties of cement slurry with 40%slag were determined,and its hydration mechanism were researched at the same time.The results show that the cement slurry with magnesium-rich slag has micro-expansive property.The linear expansivity of cement slurry with 40% magnesium-rich slag is 0.0035%on the first day and 0.0255%on the 28th day.The mixing amount of magnesium-rich slag has no significant effect on setting time,fluidity and density of cement paste.The hydration heat and early strength(three days ago)of cement slurry decrease with increasing content of magnesium-rich slag,but the late strength(after 28days)gradually increase even more than the strength of pure cement slurry.The contents of calcium hydroxide in the cement stone decrease with the increase of magnesium-rich slag and the intension of curing periods.The various engineering properties of cement slurry containing 40% magnesium-rich slag meet the basic technology requirements of cementing operation.更多还原