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Eccentric Drilling Tools with Casing Tube: through the casing. 3. Casing tube is pulled out directly or fixed at the bottom of the hole by means of cement grout or other agglutinants. 4. Drilling continues to the desired depth using ...

Symmetric Drilling Tools with Casing Tube: Symmetric Drilling Tools with Casing Tube Retrievable Symmetric Drilling tools with csing tube step-by-step: 1. When the drilling starts, the central bit drive the ring bit down the hole, meanwhile ...

4'' TND DTH Hammers for DHD340, Mission 40, QL40, COP44, SD4, WOOKE40: piston and internal cylinder guiding system are reasonably structured to achieve the highest efficiency and the largest impacting power. The penetration speed is 10%-30% faster than other products of ...

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Eccentric Drilling Tools with Casing Tube