Eccentric Overburden DTH Drilling Tools （DHD380）

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

Certification

Delivery

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