Advantages Of Symmetric Drilling
1. Great verticality of the hole and fast drilling speed.
Vertical holes can be drilled in all strata, such as gravel, sand and pebble, and drilling speed is fast. This is based on the principle of work.
2. The torque necessary for symmertic drilling is much less than for eccentric dirlling.
A smooth and steady drilling may be achieved using ring bit on all conditions and create big hole even if a small drilling rig is used.
3. Unlocking-relocking can be relatively easily achieved.
When the system needs to be unlocked during drilling, it is easier to unlock than eccentric drilling without opening and closing eccentric components in the hole.
4. Drilling can be carried out at ant angle.
Symmetric drilling can shape the hole at any angle.
5. Effective cuttings discharge.
The gas used for slag discharge in the center drilling rises along the casing immediately after it is ejected from the guide bit, so the damage to the hole wall is small and the slag discharge effect is good.
6. Easy operation and system safety
Drilling workers are relieved of the need to maintain their continuous and constant attention on drilling process since symmetric drilling can carry on smoothly.
7. Low cost
The structure and principle of operation of symmetric drilling system can guarantee considerable reduction in downtime,fewer consumable and lower operation costs.
Drilling Steps For Core Heel Pipe
Specification Of Symmetric Overburden Drilling Equipment
|Product model||Casing OD（mm）||Casing wall max （mm）||Ring bit OD（mm）||Pilot bte OD（mm）||hammer|
|Ring bit OD|