【作者】 何鑫； 王胜； 张统得； 陈绍华； 陈礼仪；

【Author】 HE Xin;WANG Sheng;ZHANG Tongde;CHEN Shaohua;CHEN Liyi;State Key Laboratory of Geohazard Prevention and Geoenvironment Protection,Chengdu University of Technology;Institute of Exploration Technology,CAGS;Natural Resources Bureau of Zhongshan District;

【机构】 成都理工大学地质灾害防治与地质环境保护国家重点实验室； 中国地质科学院探矿工艺研究所； 钟山区自然资源局；

【摘要】 针对地热开采过程中孔壁发生垮塌、漏失,而常规水泥基材料在高温条件下各方面性能恶化,满足不了护壁堵漏技术要求。采用理论分析和试验,系统地开展常规水泥材料的比较研究,筛选出多种材料及试剂进行正交试验,获得了优化配方。通过试验,以初始流动度、可泵期、凝结时间和抗压强度4个性能指标比较了普通硅酸盐水泥和G级油井水泥的抗高温性能,评选出适于研究的高温下性能相对稳定的水泥;针对高温下水泥性能衰退的问题,筛选了几种含硅材料与试剂,通过正交试验优化了配方,优化配方为:25%GS+0.6%SiO₂+0.3%JSS+1.5%SN+0.03%SC+0.3%纳米材料。性能评价结果表明,该配方流动度等性能满足一定施工要求,在高温下具有较好的抗压强度。更多还原

【Abstract】 As the hole wall collapse and leakage in the process of geothermal development,and the conventional cement-based materials deteriorates under the condition of high temperature,which can not meet the requirements of the wall protection and leakage control.A series of experiments and theoretical analysis were studied to solve such realistic problems.A variety of materials and reagents are selected for orthogonal experiment to obtain the optimal formula.Through experiments,high temperature resistance is compared between ordinary Portland cement and G-grade oil well cement in terms of four performance indexes of initial fluidity,pumping period,setting time and compressive strength,and the relatively stable cement suitable for research at high temperature is selected;In order to solve the problem of cement performance degradation at high temperature,several silica containing materials and reagents were selected,and the formula was optimized by orthogonal test.The optimized formula was as follows:25%GS+0.6% SiO₂+0.3% JSS+1.5% SN+0.03% SC+0.3% nano material.The performance evaluation results show that the fluidity and other properties of the formula meet certain construction requirements,and have good compressive strength at high temperature.更多还原