高温防漏低密度水泥浆体系的研究与应用
发布时间：2018-10-12 06:22
【摘要】：在对当前低密度水泥浆技术进行分析的基础上,利用室内实验和紧密堆积理论,优选了水泥浆的各组分含量,研制了高温防漏低密度水泥浆体系。首先以微珠、微硅粉和石英砂为外掺料,每种外掺料设置3个水平,构建了正交试验方案,测定了每种方案不同密度水泥石的抗压强度进和抗高温性能,确定了水泥浆的基础配方。然后分别对配套的失水剂、缓凝剂、增强剂等外加剂进行了分析研究,确定了各外加剂的类型、最佳加量及适用温度,进而得到了1.20-1.45g/cm3不同密度序列的深井低密度水泥浆体系。对各水泥浆体系的抗高温性、稳定性和渗透性进行了测定,发现1.30 g/cm3以上深井低密度水泥浆的表面比较光滑、均匀、密实,而1.20 g/cm3、1.25 g/cm3水泥石,由于大颗粒微珠加量大,水泥含量相对要少,造成表面比较粗糙,孔隙度较大。最后对1.35g/cm3的水泥浆体系进行了地面模拟实验,实验结果与室内评价结果基本吻合,能够满足干混工艺和地面施工的要求。研制的低密度水泥浆体系在松南地区SN-180、SN-211井进行了现场试验,有效降低了井底液柱压力,能够满足深井长封固井施工要求。
[Abstract]:Based on the analysis of the current low density cement slurry technology, the contents of each component of the cement slurry were optimized by using laboratory experiments and the theory of tight stacking, and the high temperature leakproof low density cement slurry system was developed. Firstly, using microbeads, silica fume and quartz sand as admixtures, three levels of each kind of admixture were set up, and the orthogonal test scheme was constructed, and the compressive strength and high temperature resistance of cement stone with different density of each scheme were measured. The basic formula of cement slurry was determined. Then, the types of admixtures, optimum dosage and applicable temperature are determined, and the low density cement slurry systems with different 1.20-1.45g/cm3 density sequences are obtained. The additives such as water-loss agent, retarder and reinforcer are analyzed and studied respectively. The high temperature resistance, stability and permeability of each cement slurry system were measured. It was found that the surface of the low density cement slurry above 1.30 g/cm3 was smooth, uniform and dense, while 1.20 g / cm ~ (3) C _ (3) / 1.25 g/cm3 cement stone had a large amount of microbeads. Cement content is relatively small, resulting in rough surface, larger porosity. Finally, the ground simulation experiment of 1.35g/cm3 cement slurry system is carried out, and the experimental results are in good agreement with the indoor evaluation results, which can meet the requirements of dry mixing technology and ground construction. The low density cement slurry system has been tested in SN-180,SN-211 well in Songnan area, which can effectively reduce the bottom hole fluid column pressure and meet the requirements of long cementing wells in deep wells.
【学位授予单位】：东北石油大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TE256.6
本文编号：2265104
[Abstract]:Based on the analysis of the current low density cement slurry technology, the contents of each component of the cement slurry were optimized by using laboratory experiments and the theory of tight stacking, and the high temperature leakproof low density cement slurry system was developed. Firstly, using microbeads, silica fume and quartz sand as admixtures, three levels of each kind of admixture were set up, and the orthogonal test scheme was constructed, and the compressive strength and high temperature resistance of cement stone with different density of each scheme were measured. The basic formula of cement slurry was determined. Then, the types of admixtures, optimum dosage and applicable temperature are determined, and the low density cement slurry systems with different 1.20-1.45g/cm3 density sequences are obtained. The additives such as water-loss agent, retarder and reinforcer are analyzed and studied respectively. The high temperature resistance, stability and permeability of each cement slurry system were measured. It was found that the surface of the low density cement slurry above 1.30 g/cm3 was smooth, uniform and dense, while 1.20 g / cm ~ (3) C _ (3) / 1.25 g/cm3 cement stone had a large amount of microbeads. Cement content is relatively small, resulting in rough surface, larger porosity. Finally, the ground simulation experiment of 1.35g/cm3 cement slurry system is carried out, and the experimental results are in good agreement with the indoor evaluation results, which can meet the requirements of dry mixing technology and ground construction. The low density cement slurry system has been tested in SN-180,SN-211 well in Songnan area, which can effectively reduce the bottom hole fluid column pressure and meet the requirements of long cementing wells in deep wells.
【学位授予单位】：东北石油大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TE256.6
【参考文献】
相关硕士学位论文 前1条
1 张庆军;低密度水泥浆体系设计及应用[D];大庆石油学院;2007年
，本文编号：2265104
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