DHD380 Eccentric Overburden DTH Drilling Tools Eccentric Reamer
System
Description
The eccentric reamer drill is an overburden drilling system
designed for conditions where a cased hole is required. Collapsing
holes tend to make overburden drilling expensive, with lost
drilling equipment and down time.
The eccentric designed bit rotates outward and drills a larger
diameter hole than the casing, avoiding cave-ins, wash-outs, and
other problems common in normal drilling operations in soft and
gravel-type strata or loose rock. Since 90% of the world's
overburden drilling is in loose strata, potential utilization is
enormous.
After reaching the designated depth, the reamer-bit is retracted by
reversing the direction of the rotation and by applying tension on
the reamer-bit, which has a taper and will retract into the casing
for easy removal of the entire drill-string. This leaves the casing
in place for other applications or for removal at a later date. The
method is designed for use with flush joint threaded pipe or
welded-type casing and provides a bit size for a wide variety of
different casing wall thicknesses.
Application
Introduction
Symmetric Drilling & Overburden Drilling
1.Sound drilling straightness and fast drilling speed.
Theoretically, symmetric drilling makes sure the hole in all
formations such as gravel bed, stright,the drilling speed fast and
the drilling torque relatively small.
2.The torque necessary for symmetric drilling is much less than
that for eccentric drilling.
A smooth and steady drilling may be achieved using ring bit on all
conditions and create big holes even if a small drilling rig is
used.
3.Unlocking-relocking can be relatively easily achieved.
Unlocking the system is sometimes required during the drilling
process. Relocking is easy since there are no eccentric components
that must be opened or closed inside the hole.
4.Drilling can be carried out at any angle.
Symmetric drilling can shape the hole at any angle.
5.Effective cutting discharge.
The airflow for cuttings discharge purpose during the symmetric
drilling will instantly ascend along the casing pipe after spurting
out from the pilot bit.Hence, the negligible damage on the wall of
hole can guarantee effective cutting discharge.
6.Easy to operate and system security.
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.Economical and cost effective.
The structure and principle of operation of symmetric drilling
system can guarantee considerable reduction in downtime, fewer
consumables and lower operating costs.
Parametre
| Minimum Order Quantity: | N/A |
| Price: | |
| Packaging Details: | Standard Export Delivery Package |
| Delivery Time: | 7days |
| Payment Terms: | T/T |
| Supply Ability: | Based on Detailed Order |
Certification
Delivery
FAQ
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