Study On The Cementitious System Of The Slag And Fly Ash Mixture

Energy saving and efficiency increasing are always the problems which have been attracted the attentions in the petroleum manufacturing and developing in our country. This dissertation is put forward by the principal target as achieve the manufacturing and developing of low-cost and saving energy materials that are used in oil and gas well cementing job. It is put as the center content that using the industrial discharge slag and fly ash as the fundamental material to develop the new cementing material without cement clinker. Through doing the best to launch the systematical experiment and theoretical research to the system, looking for and developing the practicable way and the system design method of new cementing material can be contented to the conventional cementing job demand. The completion of the dissertation research achievement, not only can directly reduce the cementing material cost and enhance the benefit of oil and gas field exploiting, but also can expand the apply of industrial waster in production. It also has very important significance in some parts such as saving production resources and energy and protecting environment. The research contents and results are as follows:Firstly, the forming, function, physical and chemical properties of mixed gel system using industrial waste of slag and fly ash as substrate materials of a basic admixture materials mixed system was discussed in this paper. Through the analysis of the characteristics of mixed material system,effective use of the proposed gel system is not only favorable to the environment protection, but also can satisfy the requirement of conventional cementing operation by means of matching organic ratio of multiple components.Secondly, on the basic of grain concept of high packing density theory, by contrast of different proportion of powder particle gradation and gel strength of the specimen, which are made of different fineness of fly ash and slag, on the strength of cement grinding specimens when gel particle gradation tend to close up was analyzed.Thirdly, the characteristics of synergetic hydraulic effect, which is stimulated by alkaline chemicals in the mixed gel system of slag and flying ash, was analyzed,and it provides an available method in the study of mixed gel system of slag and flying ash.The hydration products of the mixed gel system under atmospheric conditions was analyzed and studied in detail by using equipment as XRD and SEM etc, the hydration characteristic of the slag-fly ash materials and strength characteristics are revealed, and through carrying on the related survey and analysis to the main engineering capacity transformation of the multi-component system formed by slag and fly ash in different component addition, different activator and additives component and addition, different water-cement ratio condition, such as flow property, rheological property, thickening property, water loss, permeability and strength property etc. It puts forward the law that the factors as grain fraction, component addition, water-cement ratio etc. of slag, fly ash and alkali-activator and other additives affect the engineering capacity of mixed gel system.At last, according to the oil field actual requirements of shallow cementing operation, the conclusion obtained is the mixed gel system of the density 1.78~1.80 g/cm3,the fluidity 19 ~ 22cm, the initial setting time 1 hour 30 minutes to 3 hour 30 minutes, and the final setting time within 1h,which can supply the technical development theory, the experiment foundation and the practicable way for exploring the saving energy, protecting environment and low-cost cementing fluid system.In this paper, the innovative organic combination of the fly ash pollutants and blast furnace slag is applied to the oil industry cementing technique. Through the further research on chemical properties of slag, fly ash and related admixtures multiple components, the influence law of cementing mud system performance and strength at different ratio gel system is analyzed, It puts forward new approaches and design method of cementation cementing slurry system to satisfy regular cementing operation requirements. This study not only reduces the cost of cementing operation but also fill a vacancy in full use of waste residue to improve cementing quality, enriches and develops oil well slurry system material science theory ,and further expands and deepens the industrial waste in new applications, realizes the effective utilization of slag resources and the effective treatment of fly ash pollutants, has great significance in saving energy utilization and environmental protection aspect.