Core Barrel
Boart Longyear currently offers three models of the wireline core barrel system: Genuine QTM, QTKTM, and Q3TM. Genuine QTM/QTMTK wireline systems consist of the core barrel assembly and the overshot assembly. Both assemblies are integral to the wireline system. The core barrel assembly is composed of the inner-tube group and outer-tube group.
Click here to learn more about the Genuine QTM Wireline System
The inner-tube group is composed of:
- Head Assembly
- Inner Tube
- Core Lifter Case
- Core Lifter
- Stop Ring
The inner-tube group collects the core sample during the drilling process and is independent of the outer-tube group.
The outer-tube group is composed of the remainder of the core barrel components:
- Locking Coupling
- Adapter Coupling
- Outer Tube
The outer-tube group always remains at the bottom of the hole and houses the inner-tube group during the drilling process.
QTM3 wireline systems consist of the same groups as the QTM and QTMTK but utilize a third tube called an inner-tube liner or split tube that is placed inside the inner tube.
 | System Components
The core barrel system consists of various components engineered to optimize core retrieval. View major components and their functionality. |  | System Configuration
Both core barrel and inner-tube assemblies are independently configurable and include a distinct set of components. |
