摘要
低密度水泥浆在油田应用日益广泛,主要为了防止低压易漏层的漏失及满足深井一次性长封的需求,目前国内各油田对低密度水泥的研究日趋增多,但水泥浆密度在1.20g/cm3~(-1).35g/cm~3范围内的体系,其水泥石强度相对较低,一般低于14MPa,且水泥浆成本过高,因此,在现场应用中受到了很大的限制。
本文通过新型低密度水泥浆外掺料的优选,并通过不同颗粒的物化性能的分析研究,合理应用颗粒级配及紧密堆积理论,并通过大量的室内实验研究,研制出一套水泥浆密度在1.20g/cm3—1.35g/cm~3范围的新型高强低密度水泥浆体系,水泥浆沉降稳定性好,应用范围宽,水泥石抗压强度高,在一定程度上控制了水泥浆体系的应用成本,并且解决了普通漂珠低密度高压下密度升高的技术难题,为油田的勘探开发提供有效的技术支持。
Low-density cement slurry application in the field becomes more extensive, Mainly in order to prevent the loss of easy leakage layer with low pressure and to meet the demand for one-time long closure, at present, the oil field study of low-density cement growing, However, the density of the slurry within the scope of 1.20g/cm3-1.35g/cm3 system, its intensity of cement is relatively low and are generally lower than 14MPa, with the cost of excessive mud and water, so applications in the field has been greatly hindered.
In this paper, new type of low-density cement slurry through the addition of the preferred admixture and different physico-chemical properties of particle analysis, a reasonable application of particle size distribution and the closest packing theory, and a large number of laboratory studies, the development of a cement slurry density in 1.20g/cm3-1.35g/cm3 range of new high-strength low-density cement slurry system, water mud deposition has good stability, wide range of applications, high compressive strength of cement, to a certain extent control the application of slurry system costs, and the resolution of ordinary Cenosphere density increased under low-density high-pressure technical issues for the oil field exploration and development to provide effective technical support.
引文
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