Description

What is the HQ Inner Tube Head Assembly?

The HQ inner tube head assembly is a precision-manufactured unit that forms the uppermost part of the HQ core barrel system. It works in conjunction with the HQ inner tube, stop ring, core lifter, and core lifter case, collectively making up the HQ inner tube assembly. Its primary function is to enable fast, safe, and undisturbed retrieval of core samples from the borehole, all without the need to remove the entire drill string-significantly improving drilling efficiency and reducing operational downtime

Key Components and Structure

• Spearhead Mechanism:
  Facilitates secure latching and retrieval of the inner tube assembly using an overshot tool, streamlining core extraction.
• Latch System:
  Locks the inner tube in place during drilling and releases it for retrieval, ensuring operational safety and reliability.
• Spindle Bearing Assembly:
  Allows the outer tube and drill string to rotate independently of the stationary inner tube, preserving the core sample’s structure and minimizing mechanical damage3
• Compression Spring:
  Assists in gripping and breaking the core at the base, enabling secure retention and easy extraction of the sample.
• Shut-off Valve:
  Provides a fluid pressure signal when the inner tube is full or blocked, optimizing core recovery and reducing guesswork.
• Inner Tube Cap and Grease Fittings:
  Seal the assembly and allow for regular lubrication, reducing wear and extending service life.

How the HQ Inner Tube Head Assembly Functions in Core Drilling

1. Insertion and Latching:
   The head assembly is lowered into the drill string and latched into position at the bottom of the borehole using the spearhead and latch system.
2. Core Sample Collection:
   As the outer tube and bit rotate to cut into the ground, the inner tube remains stationary. This design ensures the core sample enters the tube undisturbed, preserving its natural structure
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, streamlining workflow.
4. Wireline Retrieval:
   An 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 ensures the inner tube remains stationary, maintaining high sample integrity. The assembly is then reinserted for continued drilling, maximizing efficiency and sample quality.

Technical Specifications (HQ Size Reference)

• HQ shut-off valve for core barrel
• Efficient HQ sample retrieval
• HQ double tube core barrel
• HQ drilling system components

Benefits for Drilling Projects

• Superior Sample Quality:
  The stationary inner tube ensures minimal disturbance, yielding high-integrity core samples ideal for laboratory analysis and resource evaluation
• 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 HQ 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 HQ Inner Tube Head Assembly?

The HQ inner tube head assembly is 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.

Enhance your core drilling operations with the HQ inner tube head assembly-delivering precision, durability, and operational excellence for every exploration challenge