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BQUD Horizontal Wireline Overshot Specially Designed for Horizontal Drifts
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BQUD Horizontal Wireline Overshot is a professional wireline coring fishing tool specially designed for horizontal drift drilling, tunnel advanced exploration and upward inclined boreholes. It matches BQU series horizontal wireline coring drill rods and inner tube assemblies. Optimized for horizontal working conditions such as no gravity feeding, high borehole friction and water gushing, this overshot is hydraulically driven into position by drilling mud. It can retrieve the core barrel efficiently without tripping the whole drill string, greatly improving horizontal drilling efficiency in tunnel and underground mine projects. Certifications: ISO, RoHS, MSDS |
Description
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BQUD Horizontal Wireline Overshot is a professional wireline coring fishing tool specially designed for horizontal drift drilling, tunnel advanced exploration and upward inclined boreholes. It matches BQU series horizontal wireline coring drill rods and inner tube assemblies. Optimized for horizontal working conditions such as no gravity feeding, high borehole friction and water gushing, this overshot is hydraulically driven into position by drilling mud. It can retrieve the core barrel efficiently without tripping the whole drill string, greatly improving horizontal drilling efficiency in tunnel and underground mine projects. Equipped with torsion-release lifting ring, built-in jarring mechanism and self-locking anti-drop fishing head, the BQUD overshot ensures smooth running, firm grabbing and reliable anti-drop performance. The main body is made of high-strength 40Cr steel with heat treatment, and the fishing dogs are alloy quenched for high wear resistance. Compact, durable and easy to maintain, it fully complies with DCDMA standards and is widely interchangeable with mainstream drilling tools. Certifications: ISO, RoHS, MSDS |
Product Features
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1、Hydraulic feeding design dedicated for horizontal boreholes Customized for small-size BQ horizontal and inclined holes. Instead of relying on gravity drop used in vertical-hole overshots, it is pushed downhole by drilling mud pressure, solving the difficulty of free sliding in horizontal boreholes and suiting horizontal coring in tunnels and underground drifts. 2、Self-locking anti-drop structure for high safety Equipped with 3-piece high-strength alloy fishing dogs plus rotary locking sleeve for double self-locking protection. It locks automatically once engaged with the inner tube spear head. No slipping under vibration, mud erosion or negative pressure pulling, completely avoiding inner tube falling and core loss accidents. 3、Built-in buffer jarring assembly for releasing stuck tools Integrated jarring cylinder and jarring rod tackle inner tube sticking caused by high borehole friction, rock powder deposition and mud adhesion. Quick jarring force generated by surface lifting releases jams effectively and cuts down downhole malfunctions. 4、Tapered centralizing guide for smooth running Front tapered guide perfectly matches the inner passage of BQU horizontal drill rods. No scratch on rod inner wall and no blockage during feeding, enabling the overshot to reach the hole bottom steadily and rapidly. 5、Torsion-releasing swivel lifting ring The lifting ring assembly is fitted with thrust bearing and rotary joint, which automatically eliminates wire rope torsion during lifting to prevent twisting and breaking of cables and improve underground operation safety. 6、Standardized size & easy disassembly Manufactured in accordance with DCDMA standards, fully compatible with BQU small-bore horizontal wireline drill rods and inner tube assemblies. Modular overall structure allows quick on-site replacement of worn parts without special tools. |
Core Advantages
1、Customized for small-bore horizontal drilling with superior matching performance
Optimized outer dimension for narrow BQ boreholes with large flow resistance. Compared with general overshots, it runs smoother, gets stuck less frequently and achieves higher fishing success rate, ideal for tunnel advance water exploration and shallow & medium-depth underground horizontal coring.
2、No tripping entire drill string to retrieve cores, greatly boost construction efficiency
Complete core barrels can be pulled out via wireline without lifting the whole drill string, shortening auxiliary tripping time and accelerating horizontal drift drilling progress.
3、High-strength wear-resistant materials for extended service life
Main body adopts quenched & tempered 40Cr steel; fishing dogs are treated by alloy carburizing and quenching. High hardness, impact resistance and anti-abrasion against sandy mud and broken formations, much more durable than ordinary overshots.
4、Low failure rate to cut construction costs
Integrated anti-drop, jam releasing, guiding and torsion releasing functions reduce stuck drilling, tube dropping and re-fishing work, minimizing downtime and maintenance & rework expenses.
5、Complete certifications for domestic & overseas projects
Certified with ISO, RoHS and MSDS. Universal standard size fits mainstream domestic and foreign horizontal wireline coring rigs and tools, supporting engineering bidding and export matching.
