高密度含盐水泥浆体系抗压强度发展规律研究推荐.docVIP

论文题目 高密度含盐水泥浆体系抗压强度发展规律研究 研究生姓名 导师姓名 学科专业 油气井工程 研究方向 油气井固井与完井  摘 要 随着勘探和钻井技术的飞速发展，深井泥岩、页岩、盐层地层固井越来越多，也遇到了固此类井所带来的问题，从而影响固井质量。对此，国内外学者提出了盐水固井技术，并对盐水水泥浆的性能和抗盐外加剂研制做了大量工作，但是并未对盐水水泥浆的后期强度发展做深入研究。 本文考察了不同盐浓度高密度水泥浆在低温50℃和中温90℃条件下，水泥石的抗压强度发展规律。对工程常用的淡水、含盐量5%、含盐量10%、含盐量18%及饱和盐水浓度的研究，发现饱和盐水对水泥石抗压强度影响最为严重，强度值低于12MPa,不能满足工程性能的要求。研究显示低含盐量的高密度水泥浆抗压强度优于高含盐量的水泥浆。同时，考察了不同盐浓度水泥浆高温130℃条件下水泥石抗压强度发展规律，发现加砂能够改善高温含盐水泥石的抗压强度性能。最后，用饱和盐水浸泡的方法模拟盐层环境，研究不同含盐量水泥石的抗压强度变化规律。结果显示，水泥浆自身含盐量是影响水泥石强度的主要因素，外来源盐对强度影响甚微。 通过对常规加重剂与特殊加重剂抗压强度规律的比较，说明能够配制超高密度2.7 g/cm3以上的密度为7.2 g/cm3的特殊加重剂性能比常规加重剂要好。但是在盐水环境下会产生锈蚀现象，从而影响水泥石的强度发展。基于腐蚀原因，采用加重剂保护膜技术手段来隔离氯离子和加重剂，有效地防止了氯离子的侵蚀。因此，在密度7.2 g/cm3的加重剂颗粒外包裹保护膜，将能够配制出既具有超高密度特性又能在淡水和盐水环境下具有很高抗压强度的水泥浆体系。 关键词 高密度；盐水水泥浆；锈蚀；加重剂；机理 abstract With the rapid development of exploration and drilling technology, cementing in deep mudstone, shale, salt bed formation are more and more common. Faced with the problems arising from such wells, thus affecting the merits of cementing quality. In this regard, domestic and foreign scholars proposed saline cementing technique, did a lot of work on the performance of saline mud and anti-saline additives, but did not do further study on the development of late strength of the saline cement. This paper examines the variation law of the strength of cement through the high-density slurry’s salt content at temperature 50℃ and 90℃ temperature. By the strength study of fresh water, salt content of 5%, salt content 10%, salt content 18% and saturated salt water mud, and found that saturated brine affected the strength of cement compressive most severely and strength is lower than 12MPa which can not meet the engineering performance requirements. Studies have shown that the high density cement of low salinity is better than that of high salinity. At high temperature of 130℃,we studied the influence of the te