
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
1. Shipping time for an order
We have many stock. As usual, we can delivery the goods as soon as
we get the full payment.
2. Quality Control
Strict inspection and testing for every order before shipping out .
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Beijing Jincheng Mining Technology Co., Ltd.
Beijing Jincheng Mining Technology Co., Ltd. (JCDRILL) is located in Beijing, China. For more than 20 years, we have specialized in the research, development, and production of rock blasting drilling rigs, water well drilling rigs, diamond core drilling rigs, anchor drilling rigs, and related accessories & drilling services. With our advanced technology, high-quality equipment, rigorous testing processes, and comprehensive service network, we consistently provide professional drilling solutions to our customers. These strengths have helped establish the “JCDRILL” brand as a trusted name in the market. Currently, JCDRILL products account for 50% of the domestic market and are exported to more than 40 countries. In November 2002, we were awarded ISO9001:2000 certification.
Our manufacturing facilities, covering an area of 9,625 square meters, specialize in the production of rock blasting drilling rigs, water well drilling rigs, diamond core drilling rigs, anchor drilling rigs, and related accessories. We employ more than 500 staff, including 26 experienced engineers from Ingersoll Rand and the former Xuanhua Mining Machinery Company. With our strong technological expertise and robust market service capabilities, we have developed both an efficient marketing system and an excellent service support system, earning the trust of customers worldwide.
Additionally, we serve as an authorized agent for mobile double-screw air compressors from Atlas Copco, Sullair, and Liutech. This allows us to offer drilling rig users high-quality, professional air compressor solutions along with reliable after-sales services.
At JCDRILL, we are committed to our strategic vision: “Survival by Quality, Development by Credit.” We strive to provide users with high-quality drilling solutions. Our after-sales service system follows a strict control framework based on ISO-9000 standards. This system ensures that technical data, problem-solving solutions, and preventive measures are provided for every maintenance project. All spare parts are sourced from new OEM products and come with installation instructions, packing lists, manufacturer documentation, qualification certificates, and warranty certificates.
We uphold the principle of “One Equipment, One Case, Endless Service”—our after-sales support begins from the moment an order is confirmed and lasts throughout the equipment’s entire operational life.