针对热解析后脱油钻屑处理难和处理方式单一的问题,开展了将油基钻屑残渣制备成免烧压裂支撑剂的研究,研究了钻屑与水泥比、CMC添加量、石膏添加量和养护天数共4个因素对免烧压裂支撑剂性能影响.结果表明,在原料配比较优的情况下,制备工艺为钻屑水泥比0.67(质量比),石膏添加量为6%(质量分数),CMC添加量为4%(质量分数),养护时间28 d.该条件下制得的压裂支撑剂颗粒体积密度为1.47 g/cm3,视密度为2.52 g/cm3,35 MPa下颗粒破碎率为1.57%.经扫描电子显微镜与X射线衍射仪分析发现,此时压裂支撑剂内部结构致密,孔隙封闭,水化产物CaO·SiO2·nH2O凝胶和钙长石类物质有利于提高压裂支撑剂的综合物理性能.为脱油钻屑残渣利用提供新的方向.
In view of the difficulty in treating deoiled drilling cuttings after thermal analysis and lack of treatment method choices,the research on preparing non-burn fracturing proppant from oil-based drilling cuttings residue was carried out.The research explored the effects of drilling cuttings/cement ratio,CMC addition,gypsum addition and curing days on the perfor-mance of non-bum fracturing proppant.The results show that under the condition of excellent raw material ratio,the preparation process is as follows:the drilling cuttings/cement ratio is 0.67(mass ratio),the gypsum content is 6%(mass fraction),the CMC content is 4%(mass fraction),and the curing time is 28 days.The volume density of fracturing proppant particles prepared under this condition is 1.47 g/cm3,the apparent density is 2.52 g/cm3,and the particle crushing rate under 35 MPa is 1.57%.Through the analysis of scanning electron microscope and X-ray diffraction,it is found that at this time,the internal structure of the fracturing proppant is compact,the pores are closed,and the hydration products C-S-H gel and anorthite are conducive to improving the comprehensive physical properties of the fracturing proppant.It provides a new direction for the utilization of deoiled drilling cuttings residue.