Product Overview

The Junchi (SANMON) Taper Tap is a fundamental internal catch fishing tool used in workover and drilling operations to retrieve stuck or parted tubulars from the wellbore. The tool features a precision-machined tapered body with aggressive left-hand or right-hand wicker threads that cut into the internal diameter of the fish when rotated. This cutting action creates a secure mechanical engagement, allowing high pulling forces to be applied for fish retrieval. Unlike external catch tools, the taper tap engages from inside the fish, making it ideal for retrieving tubulars where the external surface is inaccessible or damaged.

Manufactured from premium AISI 4145H alloy steel with full-length heat treatment, our taper taps deliver exceptional strength, hardness, and toughness for demanding fishing operations. The tapered nose profile guides the tool into the fish ID, while the progressively deepening wicker threads ensure reliable engagement with the pipe wall. Each taper tap is individually serialized, dimensionally inspected, and hardness tested before shipment from our Tianjin manufacturing facility.

Technical Specifications

Applications

• Stuck Drill Pipe Retrieval: Internal catch of stuck drill pipe when the tool joint or external surface is damaged or inaccessible.

• Tubing Fish Recovery: Grabbing parted or stuck production tubing, particularly in wells where external catch tools cannot access the fish top.

• Casing Fish Retrieval: Recovery of casing fish with damaged or mushroomed tops where external engagement is not possible.

• Emergency Fishing: Quick deployment fishing solution when the fish top condition is unknown and multiple catch options are needed.

• Junk Basket Backup: Used as a contingency tool when junk baskets or magnets have been unsuccessful in retrieving small tubular pieces.

Advantages

• Internal Engagement: Grabs from inside the fish ID, ideal when the external surface is damaged, mushroomed, or inaccessible due to wellbore restrictions.

• Self-Guiding Design: Tapered nose profile automatically centers and guides the tool into the fish opening, reducing mis-stab incidents.

• Progressive Cutting Action: Tapered wicker threads gradually cut deeper into the fish wall as rotation continues, creating increasingly secure engagement.

• High Torque Capacity: Robust body construction withstands the high rotational torque required to cut wicker threads into the fish material.

• Left-Hand Option: Available with left-hand wickers for use with left-hand Drill Strings, enabling rotation without backing off tool joints above.

• Optional Circulation: Central bore configuration allows circulation through the tool for washing over or equalizing pressure before pulling.

Why Choose SANMON

SANMON leverages our comprehensive manufacturing capabilities to produce fishing tools that meet the demanding requirements of oilfield operations. Our Tianjin facility features precision CNC lathes for thread cutting, computer-controlled heat treatment furnaces for consistent hardness profiles, and calibrated testing equipment including tensile testers and Rockwell hardness testers. Each taper tap undergoes a rigorous quality control process: dimensional inspection of the taper profile, thread pitch verification, hardness testing at multiple points, and full-length visual inspection for surface defects. Our manufacturing team has extensive experience producing API-specification fishing tools and can accommodate custom sizes and thread configurations. With proven field performance, competitive pricing, and responsive customer service, Junchi/SANMON taper taps provide reliable fishing solutions for workover operations worldwide.

FAQ

Q: Should I choose left-hand or right-hand wickers?
A: Right-hand is standard for conventional drill strings. Left-hand is used when you need to rotate left without backing off tool joints, typically when running on a left-hand work string.

Q: How do I determine the correct taper tap size?
A: Select a taper tap whose nose diameter is slightly smaller than the fish ID and whose maximum diameter is slightly larger than the fish ID. Our technical team can assist with proper sizing.

Q: Can the taper tap be released after engagement?
A: Unlike releasing overshots, taper taps create a non-releasing engagement by design. If the fish cannot be pulled free, the entire BHA must be retrieved together.

Q: Is circulation through the tool possible?
A: Optional central bore configurations allow circulation. Please specify circulation requirement when ordering.

Q: What documentation is provided?
A: Each taper tap is supplied with a material certificate, dimensional inspection report, hardness test results, and a certificate of conformance.