Overshot
Overshots are wireline retrieval tools used to latch onto and recover the inner tube assembly from the core barrel without dismantling the drill rod string.
Role in the Core Drilling System
The overshot plays a critical role in wireline core drilling operations. It is lowered through the drill rod string using a wireline cable to engage with the head assembly and retrieve the inner tube assembly. This enables rapid core recovery without removing drill rods, significantly improving drilling efficiency and reducing downtime.
Product Description
Spenta Engineers manufactures overshots designed for reliable engagement, smooth retrieval, and long service life in demanding drilling conditions. Each overshot is engineered for precise interaction with compatible head assemblies and wireline systems, ensuring consistent performance during repeated retrieval cycles.
Standard Sizes, Lengths & Manufacturing
Overshots are manufactured in standard sizes including AQ, BQ, NQ, HQ, and PQ. Components are produced from high-strength alloy steel with precision machining to ensure accurate latching and release mechanisms. Controlled heat treatment enhances durability and resistance to wear during continuous use.
Standard Specifications
| Available Sizes | AQ, BQ, NQ, HQ, PQ |
| Operating Method | Wireline retrieval |
| Engagement Type | Mechanical latching mechanism |
| Material | High-strength alloy steel |
| Heat Treatment | Controlled heat treatment |
| Typical Application | Wireline core drilling systems |
Selection Guidance
- Select size based on corresponding head assembly and core barrel size
- Ensure compatibility with wireline cable and winch system
- Consider drilling depth and retrieval frequency for optimal performance
Key Advantages
- Enables fast core retrieval without removing drill rods
- Reliable latching and release mechanism
- Precision-machined for smooth wireline operation
- Designed for repeated use in demanding drilling environments
System Compatibility
Overshots must be compatible with the selected head assembly, core barrel, and wireline system. All overshots supplied by Spenta Engineers are designed to integrate seamlessly with standard wireline core drilling system components of corresponding sizes.
Request a Quote for Overshot
Share your drilling requirements and system configuration, and our technical team will assist you in selecting the appropriate overshot for your application.