CORE DRILLING TOOLS

Inner and outer tubes

Core barrel tubes · sold separately

Inner and outer tubes can be ordered separately or supplied for an existing core barrel. Both are available in NQ, HQ and PQ models with 1.5 m and 3 m lengths, matched by the corresponding model. Specify tube type, model, length and quantity for replacement or matched supply.

NQ / HQ / PQ · 1.5 m / 3 m · separate supply

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Product overview

The inner tube receives core; the outer tube carries the tooling

The inner tube sits inside the outer tube and receives the core. The outer tube carries the lower assembly, with the shell and bit below it. An inner tube alone is not a complete inner tube assembly, which also includes the head and core-lifter components.

Three classes and two lengths

Inner and outer tubes are available in NQ, HQ and PQ models, each in 1.5 m and 3 m lengths. Tubes connect through the matching core barrel model. For mixed orders, list inner and outer tubes, models and lengths separately.

Prepare a clear tube supply list

List tube type, model, length and quantity: for example, NQ 1.5 m inner tubes and NQ 3 m outer tubes as separate items. List head assemblies or other components separately to clarify each item in the order.

Inner tubes

Can be ordered separately

Request inner tubes

Outer tubes

Can be ordered separately

Request outer tubes

Technical data and sizes

Tube models and lengths

Model	Length m	Tube supply
NQ	1.5 / 3	Inner or outer, ordered separately
HQ	1.5 / 3	Inner or outer, ordered separately
PQ	1.5 / 3	Inner or outer, ordered separately

Sizes and supply options

Model series	Available lengths
NQ	1.5 m / 3 m
HQ	1.5 m / 3 m
PQ	1.5 m / 3 m

Tube type	Inner tubes / outer tubes
Model series	NQ / HQ / PQ
Lengths	1.5 m / 3 m
Connection matching	Match the corresponding tooling model
Supply options	Inner and outer tubes can be ordered separately

Values are for equipment selection; supplied configurations follow the quotation and equipment documents.

Selection questions

Is the outer tube retrieved on every core run?

During a normal wireline core run, the inner assembly and core are recovered through the rods, while the outer tube remains downhole with the drill string. Bit changes or servicing may still require pulling the string.

Can inner or outer tubes be ordered on their own?

Yes. Both tube types are available separately in NQ, HQ and PQ, in 1.5 m and 3 m lengths. Specify type, matching model, length and quantity.