Why is bentonite used in bored pile?

Why is bentonite used in bored pile?

 

Mud bentonite is made of high quality Liaoning bentonite by artificial sodium. What is the difference between mud bentonite and common mud clay? In the process of rotary drilling, mud should always be adhered to in the hole. The mud is pumped to the bottom of the hole through the hollow drill pipe, then flows out of the open space of the drill bit, and then rises to the surface through the annular space between the well wall and the drill pipe and flows into the mud pit. The function of mud is to remove the cuttings and exhaust the gas, and then go down from the mud pit to the borehole to restrict the water in the formation to enter the borehole. And an impermeable layer is formed on the hole wall to prevent water from entering the formation from the drilling fluid. This thin impermeable layer has certain strength and resistance. Only in this way can the corrosion caused by drilling collapse and drill pipe grinding be avoided. In the process of drilling, the change of electrolyte concentration requires that the viscosity and thixotropy of mud change little. This is not available for ordinary mud, so the mud bentonite should be used for Bored Pile! Beipiao Tongxin bentonite Co., Ltd