casign line

Study of circulating casing running device with pressure added at the wellhead;

可循环式井口加压下套管装置的研究

A pneumatic casing slip is developed to solve the problems in casing running.

目前下套管作业主要采用吊卡卡持套管和液压大钳或B型大钳上螺纹的作业方式,工人劳动强度大,工作效率低,容易造成单吊环起钻,从而引发重大工程和人身安全事故。

By solving the mechanical model, the casing bearing forces can be obtained under the conditions of different hole types, mud density, casing suspension length and casing running ways.

通过对模型的求解 ,可以得到不同井眼类型、泥浆密度、悬浮长度以及不同下套管方案下的套管受力 ,为大位移井下套管作业提供了力学参考 。

Reinforcing skill of stone arch bridge by reinforced concrete arch-lifted method;

钢筋混凝土下套拱法加固石拱桥技术

The reinforcement and construction of under origin arch is discussed in the paper.

结合工程实例,通过对大跨度石拱桥的病害调查,分析了其产生的原因,提出三种可行性加固方案,并对方案进行了优选,重点介绍了下套拱加固施工方法,有一定的借鉴作用。