HDD means horizontal directional drilling or Directional boring, is a steerable trenchless method of installing underground pipes, conduits and cables in a shallow arc along a prescribed bore path by using a surface-launched drilling rig, with minimal impact on the surrounding area.
HDD fluids system
Drilling fluids have several important functions. They cool and lubricate the drill bit, stem and other down hole tools. The fluid also assists in sealing the sides of the bore, therefore stabilizing the borehole. Finally, drilling fluids are designed to carry the cuttings out of the hole.
The most widely used drilling fluids for HDD applications are bentonite, even if they are not so expensive compared with oilfield drilling fluids, but it is still a pollution for the environment, especially usually they dig a mud pit for HDD and pump the drilling fluids from the mud pit to shale shaker. After the directional boring, how to treat the used drilling mud become a problem.
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The mud cleaning system produced by GN solids control is widely used for horizontal directional drilling , water welling drilling ,coal bed methane, geothermal hole and mining diamond core drilling , it is used to separate the drill cuttings from the mud, so that the clean mud can be re-circulated to continue the drilling process.
As the Geothermal drilling usually close or inside the downtown, this requires the mud system to be compact with less footprint and user friendly with less noisy. Also Geothermal well drilling sometimes require high capacity performance for deep wells. Below is the jobsite photo of mud cleaning system for geothermal drilling, which is produced and commissioning by GN solids control.
Geothermal mud cleaning system
Like water well drilling, mud rotary drilling is also the desired method for installing geothermal loops. As the bit penetrates the soil, it creates smaller fragmented pieces that are called drill cuttings. The mud carries these cuttings to surface to create an open hole from the top down to the bottom. The drill cuttings are collected into a mud pan or settling pit on surface and then the mud is re-circulated to continue the drilling process.
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