钻井井壁可缩性接头位置的优化分析

Optimization Analysis for the Location of the Compressive Joint for the Drilling Shaft Lining

针对地层沉降条件下提出的可缩性钻井井壁结构,应用分析软件对可缩性接头位置进行了优化分析,分析表明:新型可缩性钻井井壁结构能有效地减少作用在井壁上的竖向附加力(即负摩擦力),放置在风化基岩中部的可缩接头能减少井壁附加力达58%。研究成果可供可缩性钻井井壁结构的设计和应用参考。

Aiming at the retractable drilling shaft lining structure proposed under the condition of stratum subsiding, optimization analysis for the location of the compressive joint is carried out by 2D-σanalysis software The results of analysis indicate that the vertical additional forces forced on the shaft lining can be effectively released; the value of vertical additional forces can be released by about 58% when the compressive joint is located in the middle of weathering bed-rocked. The results of the study can be used as a reference for the design and application of retractable drilling shaft lining structure.