High pressure ODex drilling system concentric drill bit 219-DHD360

Concentric Casing System

Working Principle of Drill:

1. Ring bit and casing shoe assembly is welded to casing prior to drilling. Lock the assembly into pilot bit with hammer. The pilot bit' shoulder engages the shoulder of the casing shoe.

2. Hammer's percussive energy is transferred through the pilot and ring bit, crusing rock. Part of impact energy advances casing.

3. On completion of drilling and casing, the drill string wit pilot bit is retrieved by a slight reverse rotation to unlock the bayonet coupling. The ring bit stays in the hole, and can be recovered only if the casing is retrieved.

4. If further drilling is required on the bedrock, the pilot bit is simply replaced by an appropriate size of standard DTH bit.

Advantages of Concentric Drilling:

1. Drilling straight and fast.

2.The torque for Concentric drilling is much less than for eccentric drilling

3. Easily unlocking-relocking.

4. Drilling in any angle.

5. Effective cuttings discharge.

6. Easy-to-operate and system security.

7. Economical and cost-effective.

-------------------------------------------------------------------------FAQ-------------------------------------------------------------------

Q: What kind of payment terms do you offer and what is your best payment terms?

A: We offer different payment terms, including T/T, D/A, D/P, L/C and O/A, etc.  

Q: Do you offer warranty on your products?

A: Yes, for different products we offer different warranty that cover all manufacturing defects in materials and workmanship. The longest period of warranty is 2 years after shipping date.

Q: Do you offer OEM service?

A: Yes, we can offer OEM service if you have regular requirement.

Q:Can I have a sample for testing?

A:Samples are still to be paid but discounted price can be provided.

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.