70mm & 73mm CHD Drill Rods MCHD Specifications

CHD Drill Rods 70mm & 73mm MCHD Specifications

Deep Hole CHD Wireline Core Rod

CHD Drill Rod was designed for deep hole wire line applications, with its strong tool joints, and flexible mid body, it excels in directional drilling applications.

CHD Drill Rod with a communication channel is designed for horizontal directional drilling using a telemetry system.

Deep Hole CHD Wireline Core Rod

CHD wireline drill rod was originally developed to address a requirement for a dependable drill string for deep hole gold exploration in the South African mining industry. As its reputation grew as a reliable deep hole coring drill rod it was used extensively in the slim hole oil and gas industry with applications worldwide by companies such as Standard Oil, Texaco, and Total S.A.  The North American geothermal industry also found the CHD drill string an excellent match for their deep coring applications.

From a design standpoint the HD drill rod is an internally upset product with a robust tool joint fused to a lighter wall mid-body using plasma arc welding technology.

ROSCHEN CHD Drill Rods feature a double buttress thread which is unique in that it can deliver both exceptional strength for depth and the durability perform on larger drill rigs used in deep hole coring operations. CHD strings are commonly known as CHD 76 / CHD 101 / CHD 134 for their respective hole diameters. The CHD drill rod is available in diameters 69.9 mm – 94mm – 127 mm in lengths up to 6 meters.

Overview

1. CHD Drill Rod was designed for deep hole wire line applications, with its strong tool joints, and flexible mid body, it excels in directional drilling applications.

2. Welded tool joints of specially heat treated steel with very high mechanical resistance

3. Superior welding process and weld inspection to ensure optimum concentricity

4. Mid body of annealed cold-drawn, seamless steel tubing

5. Straightness and Hoop Stress controlled tubing

6. Specific thread design for deep hole drilling with very high resistance as to torque and as to extension

Can be supplied fitted with RCS inserts

The 73mm MCHD drill rod was developed specifically for challenging deep applications, offering over 150% increase in torque strength.

Rod Communication System (RCS)

The need for better drilling management and efficiency in the directional drilling community paved the way for RCS. Using the RCS in DPI rods allows the driller to receive real time survey data to not only directionally drill but also to provide sampling data of the formation being drilled. This improves drilling time and penetration rates by negating the waiting periods for gathering conventional survey data.  Each rod added to the drill string automatically increases the wireline length and is ready for surveying.