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
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1
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2
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First, ring drill and tube boots are welded with sleeves. Then lock the guide head and the ring bit to ensure that the guide bit is engaged with the pipe boots.
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The impact of the impactor can be spread to the guide bit and the ring bit to start the rock breaking, and driving the casing downward.
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3
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4
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Completed task, the drill is retrieved by a lightly reverse transfer port and unlocked. The ring bit is left in the hole, and when the hole is finished, we can take out it with casing.
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If you want to continue to drill in bedrock,please replace drill bit with suitable standard bit.
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