What is the NQ Inner Tube Head Assembly?

The NQ inner tube head assembly is a precision-engineered component used in wireline core drilling systems, specifically designed for NQ-size core barrels. It plays a vital role in obtaining undisturbed cylindrical core samples from various geological formations, supporting mineral exploration, geotechnical investigations, and environmental studies

Key Components and Structure

The NQ inner tube head assembly consists of several integral parts, each contributing to efficient and reliable core drilling:

• Spearhead: Enables secure latching and retrieval of the inner tube assembly using an overshot tool

• Latch Mechanism: Locks the inner tube in place during drilling and releases it for retrieval

• Spindle and Bearings: Allow the outer tube and drill string to rotate independently of the stationary inner tube, protecting the core sample from rotational disturbance

• Compression Springs: Facilitate smooth core breaking and secure retention within the inner tube

• Shut-off Valve: Provides a fluid pressure signal to indicate a full or blocked inner tube, helping drillers optimize core recovery and minimize downtime

• Inner Tube Cap and Grease Fittings: Seal the assembly and allow for regular lubrication, reducing wear and extending service life

How the NQ Inner Tube Head Assembly Works in Core Drilling

1. Insertion and Latching:
   The inner tube head assembly is lowered into the drill string and latched into position at the bottom of the borehole using the spearhead and latch mechanism

2. Core Sample Collection:
   As drilling progresses, the outer tube and bit rotate to cut into the ground, while the inner tube remains stationary, allowing the core sample to enter the tube undisturbed

3. Core Retention and Indication:
   The core lifter and compression spring grip and break the core at the base when the tube is full. The shut-off valve signals the operator when it’s time to retrieve the core sample, optimizing workflow and reducing guesswork

4. Wireline Retrieval:
   The overshot tool is sent down the drill string to latch onto the head assembly, enabling rapid and safe retrieval of the inner tube and core sample without removing the entire drill string

5. Sample Integrity and Repeatability:
   The spindle bearing assembly ensures the inner tube remains stationary, preserving the core’s original structure. The assembly is then reinserted for continued drilling, maximizing efficiency and sample quality

Benefits for Drilling Projects

• Superior Sample Quality: The stationary inner tube ensures minimal disturbance, yielding high-integrity core samples ideal for laboratory analysis

• Operational Efficiency: Wireline retrieval reduces downtime and increases productivity by allowing core extraction without full drill string removal

• Durability and Compatibility: Manufactured to international standards, the NQ inner tube head assembly is compatible with a wide range of drilling equipment and withstands demanding field conditions

• Enhanced Safety: Reduces manual handling and operational risks through streamlined retrieval processes

• Versatility: Suitable for mineral exploration, geotechnical surveys, and environmental investigations across various rock types and formations

Applications

• Mineral resource exploration (gold, copper, coal, etc.)

• Geotechnical and civil engineering site investigations

• Environmental and hydrogeological core sampling

Why Choose the NQ Inner Tube Head Assembly?

Optimize your drilling operations with the NQ inner tube head assembly-a solution engineered for high-performance core recovery, minimal sample disturbance, and efficient workflow. Its robust design, reliable latching, and advanced spindle bearing technology make it the preferred choice for professionals seeking accuracy, safety, and productivity in every drilling project

Maximize your core drilling success with the NQ inner tube head assembly-delivering precision, durability, and operational excellence for every exploration challenge.