HWL Overshot
HWL Overshot
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The HWL overshot is a tool used in diamond core drilling operations to retrieve and extract the core barrel from the borehole. HWL refers to "Hole Quarter" or "High Quality," indicating a core size with a diameter of approximately 2.5 inches or 63.5 millimetres.
The overshot is designed to engage with the core barrel and provide a secure connection for lifting and removing it from the borehole. It consists of several key components that work together to facilitate the retrieval process.
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Body: The overshot body is typically a cylindrical component with a threaded connection compatible with the core barrel. It serves as the main housing for the overshot and provides the structural support and strength required for the lifting operation.
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Gripping Mechanism: The overshot features a gripping mechanism, such as retractable fingers or wedges, located within the body. This mechanism is designed to securely grip and hold the core barrel during retrieval. When activated, the gripping mechanism firmly engages with the core barrel, ensuring a tight connection.
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Lifting Dogs: The overshot may have lifting dogs or lugs on its upper portion. These dogs provide attachment points for lifting equipment, such as a hoist or winch, to facilitate the upward movement of the core barrel.
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Release Mechanism: To release the overshot from the core barrel once it reaches the surface, there is typically a release mechanism incorporated into the design. This mechanism allows the gripping mechanism to disengage from the core barrel, allowing for its removal.
During the retrieval process, the overshot is lowered into the borehole until the gripping mechanism engages with the core barrel. Once engaged, the overshot is lifted using appropriate lifting equipment, applying upward force to the core barrel. The gripping mechanism securely holds the core barrel, allowing it to be safely extracted from the borehole.
The HWL overshot is specifically designed for use with HWL-sized core barrels, which have a diameter of approximately 2.5 inches. It is crucial to match the overshot size and compatibility with the corresponding core barrel and drilling equipment to ensure effective operation.
HWL Core Barrel
An HWL core barrel typically comprises key components, including an outer tube, inner tube, and a core lifter. The core lifter is a crucial mechanism designed to securely hold and extract the core sample from the geological formation. The inner tube is used to collect the core sample, while the outer tube provides protection to the core sample during drilling and retrieval. HWL core barrels adhere to specific dimensions, with an inner tube diameter of approximately 3.0 inches (76.2 millimetres).
This standardized size allows HWL core barrels to be compatible with a variety of drilling equipment and systems. HWL core barrels are commonly used in drilling projects related to geological exploration, mineral sampling, geotechnical investigations, and other applications that require a moderately-sized core sample for analysis.
Our Core Barrel Components
Our Core Barrel Accessories is a comprehensive collection of specialized tools and components designed to enhance and optimize the core barrel drilling process. Developed by industry experts with extensive knowledge in core sampling and exploration, these accessories offer practical solutions to overcome challenges and maximize efficiency in various geological and mining applications.