Slickline Anti Blowout Tool

Description

Slickline Anti Blow-Up Tool: Technical Description and Specifications

The Slickline Anti Blow-Up Tool (ABUT) is a critical downhole safety component installed directly into the tool string, typically above sensitive instruments (like memory gauges). Its primary function is to mechanically anchor the tool string within the production tubing to prevent uncontrolled upward travel, or “blow-up,” caused by sudden, excessive upward fluid velocity or differential pressure surges (e.g., cross-flow from highly pressurized zones).

Key Technical Specifications and Operation

• Function: To automatically engage and stop the tool string’s upward movement in the event that the upward hydrostatic or fluid drag force exceeds the combined downward weight of the tool string (stem).

• Mechanism: The tool operates hydraulically and mechanically based on differential load:

  1. The tool is run with the dogs/arms retracted, held in place by the weight of the lower tool string (often the memory gauge carrier).

  2. If an upward force (surge) lifts the bottom equipment, a cone or mandrel inside the ABUT moves upward, forcing spring-loaded dogs or arms radially outward to mechanically lock onto the inner wall of the production tubing.

  3. This engagement creates a massive drag/holding force, preventing further upward movement.

• Release: The lock is released by applying a controlled, downward pull or set-down weight on the slickline, which moves the internal cone/mandrel back to its original position, retracting the dogs.

• Connection (Customizable):

  • Standard interfaces include industry-standard slickline pin threads (e.g., $15/16″-10$ UN) and proprietary connections.

  • Custom order connections are available to ensure full compatibility with all quick-connect systems (e.g., QLS, HQC) and non-standard tool string threads.

• Material (Customizable):

  • Standard construction uses high-yield alloy steel.

  • Custom material options are available to meet environmental specifications, including NACE MR0175 compliant alloys for sour service, ensuring the mechanical integrity of the locking dogs/arms in corrosive fluids.

• Critical Parameters (Customizable Size):

  • Tubing ID Range: Each tool is rated for a specific range of tubing IDs (e.g., $2-3/8″$ through $3-1/2″$).

  • Custom Dog/Arm Span: Fabricated to ensure optimal engagement force and clearance across a specific or non-standard tubing ID. Clients must specify the target tubing ID and the maximum allowable OD restriction when ordering.

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Secondary: Tool String Anti-Ejection Device, Downhole Pressure Surge Tool, Safety Dog Tool.