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井下套管摩阻大,大斜度井段易形成岩屑床,加之要求127mm套管下至大斜度井段,井段有两处缩颈,将尾管下到位的难度大;蹩压坐挂、碰压困难。大斜度井段井径不规则,套管在大斜度井段的居中度低,顶替效率差;水泥浆自由水极易聚集在井壁上侧形成连续的水槽或水带或低边水泥颗粒的沉降窜槽,不能有效封固;钻井液中混气的比例高,影响水泥浆的胶结质量。通过白56H井的尾管封固大斜度井段的固井施工难点分析,从井眼准备、管串结构、水泥浆体系设计等方面提出该井尾管固井技术措施。在实际固井施工后,测固井质量一般,通过总结分析后,提出了该井尾管固井技术需要改进的地方。
Downhole casing friction large, easy to form a large inclined well section of cuttings bed, combined with the requirements of 127mm casing down to the high gradient section, section has two necks, the tail pipe to the next place is difficult; Hanging, touch pressure difficult. The large diameter section has an irregular diameter and the casing has a low centering efficiency and a poor replacement efficiency. The free water of the grout can easily gather on the upper side of the shaft to form a continuous sink or water band or low-side cement Particle sedimentation channeling, can not be effectively sealed; the high proportion of drilling fluid in the gas mixture, affecting the cementing quality of cement. Through the analysis of difficulties in cementing construction of high-inclination section sealed by tail pipe of Bai56H well, technical measures of well cementing are put forward from wellbore preparation, pipe string structure and cement slurry system design. After the actual cementing construction, the quality of the measured cementing well is general. After the summary and analysis, it is proposed that the well cementing technology needs improvement.