Both bits connect with the casing pipes, just the different of thread & ID. The casing shoe bits' ID size can thru core barrel, the casing bits ID is small and can't thru the core barrel.
Casing bits can drilling and then coring. The casing shoe bits alongwith the casing pipes to drill together, the coring rock stay in the casing pipes, after the casing pipes drilling, then to drill use the core barrel which inside in the casings.
Use casing bits drilling, when core barrel coring must extract the casings & casing bits to change to casing shoe bits, and then put the core barrel.
Use casing bits drilling can't put the core barrel, however because of use the casing bits to coring, the integrity and core recovery will be better, so the coring will be choose to use casing pipes & casing bits in the soft formation and shallow hole, and change to core barrel after in the hard formation, the casing pipes must be in the hard formation.
Notes:
Imp. - Impregnated Diamond Type
S.S. - Surface set Diamond Type
T.C. - Tungsten Carbide Type
E.P. - Electroplated Diamond Type
Q: What's your delivery time?
A: Commonly produce need 20 days to produce. Within 3 days if in stock.
Q: What methods of payment are accepted?
A: We agree T/T, L/C, West Union, One touch, Alipay, Money Gram, Paypal.
Q: What about the shipment?
A: Based on order quantity. We can send it to you by Express, by Air, by Sea, and by Train. Or send the goods to your chinese agent.
Q: How to control the quality?
A: We should be checking & testing everyone drill bit before shipment.
Q: Do you agree sample order?
A: Yes, we are welcome your sample order to testing our quality.
Q: Can we select the color of the drill bit?
A: Yes, we have standard rock hardness select index to choose drill bit matrix hardness. If you need, we can make the drill bit color based on yours.
Q: Do you have after-sale service and warranty service?
A: Any quality or quantity problem once confirmed, we will be compensate you the same. Any question or problem we will be reply you within 24 hours.
