127-DHD3.5 concentric drill bits suitable for drilling water wells
Application Range: It is suitable for drilling water wells, geothermal wells, Micro piles, medium mini-type grouting hole of building, dam and harbor project.
Design Principles: Make the casing follow easy and the equipment and operation simple.
Outstanding Advantages:Simple structure, easy operation, reliable quality, retrievable drilling tools, and long service life.
Operation Procedure:
1. As soon as the drilling starts, the reamer opens and enlarges the hole to drive the casing shoe and casing tube down.
2.When drilling in over-burden formation is done, Start reverse circulation to close the reamer, and then pull up the assembly through the casing tube.
3.The casing tube can be left in the hole, or can be pulled out by means of grout sealing material.
4.Use the normal drilling tools to drill and achieve to the desired depth.
----------------------------------------------FAQ----------------------------------------------
Q: Which payment terms can you accept, if we need place an order of 127-DHD3.5 concentric drill bits?
A: Normally we prefer 30% advance payment after purchase order by T/T, 70% remaining payment before shipping by T/T. And 100% advance payment after purchase order by T/T for small orders.
Q: 127-DHD3.5 concentric drill bits which field will be using?
A: Application Range: It is suitable for drilling water wells, geothermal wells, Micro piles, medium mini-type grouting hole of building, dam and harbor project.
Q. Do you have different type for different kind of stone?
A.Yes,according hardness of stone and stone's feature, we have different type respectively.
Q: How long is your delivery time?
A: Generally speaking, 5-10 days if have stock.Regular order delivery in 20~30 days if without stock.Otherwise it depends on your order Quantity.
