Geological Exploration Drill Pipe Specifications

Geological Exploration Drill Pipe Specifications: 

In the field of geological core drilling, drill pipes are essential tools for obtaining underground core samples and exploring mineral resources. The Q-series wireline coring drill pipes under the internationally recognized DCDMA standard are currently the most widely used specification system.

Q-series wireline coring drill pipe specifications:

1. AQ type drill pipe: Outer diameter 1.625 inches (approximately 41.3 mm), inner diameter 27.0 mm.
Application: Primarily used for shallow hole drilling to depths not exceeding 300 meters; single pipe length 1.5 m or 3.0 m.

2. BQ type drill pipe: Outer diameter 2.125 inches (approximately 54.0 mm), inner diameter 36.5 mm.
Application: Suitable for medium-shallow hole drilling to depths of 300 to 600 meters; single pipe length 1.5 m or 3.0 m.

3. NQ type drill pipe: Outer diameter 2.750 inches (approximately 69.9 mm), inner diameter 47.6 mm.
Applications: Suitable for medium-depth drilling (600-1000 meters), this is the most frequently used model in geological exploration. Single pipe lengths are 1.5 meters or 3.0 meters.

4. HQ Drill Pipe: Outer diameter is 3.750 inches (approximately 95.3 mm), and inner diameter is 63.5 mm.
Applications: Suitable for deeper boreholes (1000-1500 meters), allowing for the extraction of larger diameter core samples. Single pipe lengths are 1.5 meters or 3.0 meters.

5. PQ Drill Pipe: Outer diameter is 4.500 inches (approximately 114.3 mm), and inner diameter is 83.3 mm.
Applications: Suitable for deep-hole drilling (1500-2000 meters and above), providing ultra-large diameter core samples. Single pipe lengths are 1.5 meters or 3.0 meters.

In addition, thicker specifications such as NQ3 and HQ3 are used in some drilling scenarios to suit deeper or more complex formations.

Features and Applications of Q-Series Models:

AQ Drill Pipe: Smallest outer diameter, lightweight, and easy to transport; primarily used in ultra-shallow holes or scenarios with extremely low drilling load requirements.
BQ Drill Pipe: Entry-level model, suitable for shallow to medium geological surveys and exploration.
NQ Drill Pipe: The most frequently used model, achieving a good balance between performance and portability; suitable for most medium-depth solid mineral exploration projects.
HQ Drill Pipe: Used for deeper boreholes or projects requiring large-diameter cores; better able to handle fractured formations and improve core recovery rates.
PQ Drill Pipe: Largest outer diameter and core diameter; primarily used for deep ore body exploration and scientific research requiring large-size cores.
 

Drill Pipe Material: 

Q-series drill pipes are typically made of alloy structural steel such as R780, ZT series, or 42CrMo. These materials, after quenching and tempering, possess high strength, high toughness, and good fatigue resistance, effectively handling torsional, tensile, and impact loads generated during drilling in complex formations.

When selecting geological exploration drill pipes, it is necessary to comprehensively consider the exploration depth, target core diameter, drilling rig capacity, and on-site transportation conditions. The NQ model, as the most balanced option, is the top choice for most geological projects. However, for deep mineral exploration projects, it is recommended to prioritize the HQ or PQ models to obtain more reliable core samples and higher drilling efficiency.

Conclusion:

This article introduces a list of common drill pipe sizes and specifications, the application range and characteristics of each drill pipe. When selecting drill pipe, factors such as well depth and the hardness and density of the well wall must be taken into consideration. Proper selection of drill pipe can improve drilling efficiency and reduce costs.

Go here to learn more: Drill Pipe HS Code

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