博文

目前显示的是 十月, 2018的博文

Trend of HDD&Trenchless System

图片
The mud used in the HDD&Trenchless system must be a mixture of freshwater and mud materials that meet the geological conditions, not just clear water, because the flowing water does not have the corresponding carrying capacity and wall protection performance, and it will also continuously penetrate into the surrounding rock strata, leading to borehole collapse or Shrinkage will increase the drag and rotation pressure and cause excessive wear on drill pipes and drilling tools. At present, the main methods of HDD&Trenchless system in China are similar to oil drilling methods, such as dilution, precipitation and mechanical removal. The three way is not to use one single type, but to mix and match each other. Solid state control system is a commonly used method for horizontal directional crossing mud recovery. He can separate the large solid particles from the mud effectively, and keep a large amount of bentonite and other drugs in the mud. Only a small amount of bentonite c