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随着油气田勘探开发技术的深入发展，深井，超深井的数量不断增多，深井，超深井的特点是：井深，温度高，水泥环薄，固井难度大，而各种增产工艺，措施和后期作业对油气井固井质量也提出了更高的要求。水泥本身具有硬和脆的性质，受后续施工，射孔或由由于地层条件下复杂作用力的影响，易发生脆裂，或与套管，井壁剥离，影响油气井后期开采，缩短油气井的寿命，文章通过研究深井塑性水泥原理，提出评价方法和塑性水泥配方，进行了塑性水泥施工性能的力学性能的大量实验，并在此基础上完成了20井次注水泥施工，实践表明，塑性水泥具有优良的综合性能和抗外冲击能力，施工方便，能提高深井复杂井的固井质量。

RESEARCH AND APPLICATIONOF PLASTIC CEMENT SLURRY SYSTEM OF DEEP WELL IN SICHUAN

Along with the technological progress in oil and gas field exploration and development,the amount of deep wells ultradeep wells will be continuously increased.The characteristics of the deep wells and ultradeep wells include a large depth,high temperation,a thin cement sheath and being very difficult to make well cementing.Meanwhile a higher demand on the quality of oil and gas well cementing is put forward for making various stimulation techniques and measures and late workings.Because cement has rigidity and brittleness,it is easy of embrittlement or peeling off with casing pipe or wellface due to the effects of late workings and perforation or of the complex acting force under formation conditions,thus affecting the late production of oil and gas well and shortening the life of the well.Through studying the principle of the plastic cement slurry of deep well,the evaluation method and the formulation of the plastic cement slurry were proposed. At the same time,a lare mumber of experiments about the working performance and mechanical performance of the plastic cement slurry had been made and on the basis of this,20 well times of cementing practice were completed.Through practice it is shown that the plastic cement slurry is of excellent synthetic performance and the capacity of resisting external impact force and it can make the cementing practice convenient and improve the quality of cementing in deep wells and complex wells.