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Releasing Sub

Reliable Reversing Sub for Stuck Drill Stem Recovery Operations

GREAT DKJ Reversing Sub is a specialized fishing and reversing tool designed for reversing stuck drill stems above the stuck point during drilling and workover operations. The tool functions as both a reversing sub and a fishing pin tap, providing reliable engagement and controlled reversing capability in complex downhole fishing applications.

When conventional reversing or fishing operations fail, the reversing sub allows the fish to be reversed safely, enabling recovery of the fishing assembly and minimizing operational downtime.

Applications

  • Stuck Drill Stem Recovery
  • Reversing Operations
  • Fishing Operations
  • Workover Applications
  • Drill String Retrieval

Key Advantages

  • Reliable reversing capability for stuck drill stems
  • Functions as both reversing tool and fishing pin tap
  • Supports safe disengagement during difficult fishing operations
  • Durable heavy-duty construction
  • Wide range of thread configurations available
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The DKJ Reversing Sub, also known as a reversing spear, is a special downhole tool designed for reversing stuck drill stems above the stuck point during drilling and workover operations. The tool is widely used in fishing and reversing applications where drill strings or fish become stuck and cannot be recovered through standard operations.

During reversing operations, the reversing sub functions similarly to a fishing pin tap, securely engaging the fish while transmitting reversing torque through the drill string. If the fish cannot be reversed or retrieved successfully, the reversing sub enables safe disengagement, allowing the fishing assembly to be tripped out of the hole.

The tool is available in multiple thread configurations, including:

  • Thread Connection LH / Fishing Thread RH
  • Thread Connection RH / Fishing Thread LH
  • Thread Connection RH / Fishing Thread RH

Manufactured from high-strength alloy steel with precision-machined threads, the DKJ Reversing Sub is engineered to withstand high torque loads and severe downhole operating conditions.

Key Features

  • Specialized reversing and fishing tool design
  • Functions as both reversing sub and fishing pin tap
  • Multiple thread direction configurations available
  • High-strength alloy steel construction
  • Precision-machined connection and fishing threads
  • Reliable torque transmission capability
  • Durable performance in severe downhole environments
  • Wide compatibility with drilling and fishing assemblies

Applications

  • Stuck Drill Stem Recovery
  • Fishing Operations
  • Reversing Operations
  • Workover & Well Intervention
  • Drill String Retrieval
  • Downhole Tool Recovery
  • Tubular Fishing Operations
  • Heavy-Duty Well Servicing Applications

Advantages

  • Enables controlled reversing of stuck drill strings
  • Allows safe disengagement if fish cannot be recovered
  • Reduces non-productive time (NPT)
  • Reliable thread engagement during fishing operations
  • High torque handling capability
  • Flexible thread configuration options
  • Improves operational safety during recovery operations
  • Durable construction for repeated downhole use

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