To apply oil industry special purposed floating hoop and shoe on coalmine service borehole casing lowering and consolidation,the main issue need to be solved is how to automatically open the valve,let the slurry pass through when the pumping pressure rising to 2MPa,otherwise the valve will be in off state all along.

The CFD mathematical models is presented to solve the severe slug flow in a declination-riser pipe system and the VOF method is used to track the moving interface between gas-liquid two phase fluids.

Study the influence of tunnel construction on the neighboring underground pipeline;

Probe into the Final Survey Methods of the Underground Pipelines;

General investigation method of underground pipeline in small cities and towns;

Crack Analysis On The Drum Downcomer Union Joint of 20MnMo

This article deals with the method of how to design downcomer self-support structure,and analyze it with the help of Caesar Ⅱ software,as well as how to resolve the problem of overstress by means of increasing the pipe thickness.