Sentinel TRSV Flow Tube Exercise Tool

Our Sentinel TRSV flow tube exercise tool is a wireline-deployed accessory tool designed to shift or “exercise” a fouled, or stuck, flow tube of a downhole tubing-retrievable safety valve.

Render of  Subsurface Safety Valve Flow Tube Tool
  • Description Description
  • Ruler Specifications
  • Resources Resources

Our Sentinel™ tubing-retrievable safety valve (TRSV) flow tube exercise tool (FTET) is a wireline-deployed accessory tool designed to shift or "exercise" a fouled, or stuck, flow tube of a downhole TRSV. Flow tube fouling can occur from wellbore fluid precipitates falling out of solution during production and solidifying around the inside of the TRSV. Scale and other solids can accumulate around the outside of the flow tube over time and increase the operating friction within the valve. The increase in friction can lead to situations in which the safety valve power spring cannot adequately close the flapper and the hydraulic piston cannot open the flapper. When this occurs, the FTET is required to manually shift the flow tube, physically assisting in clearing the debris or scale. Used in conjunction with the hydraulics, the FTET can manipulate the flow tube until normal operation is restored.

The FTET is deployed with standard wireline equipment (spang jar and weight bars) until it lands on the no-go shoulder within the safety valve. Mechanical jarring engages the FTET’s grip segments within the TRSV’s flow tube. Upward jarring engages the flow tube, clearing debris and scale while pulling it into the fully closed position. Cycling the safety valve with alternating hydraulic pressure and upward jarring will help free the flow tube. Continued upward jarring will release the flow tube grip segments and allow the FTET to be easily recovered from the well.

The FTET is a simple, proven, and robust accessory tool for manipulating stuck smooth-bore flow tubes within downhole safety valves, sliding sleeves, or other tools. It does not require fluid within the well or additional wellbore hydraulic pressure to successfully function, and it can be modified to accommodate internal fishing profiles if needed.


  • Simple, robust design
  • Straightforward operation
  • Interchangeable no-go ring for different lock profiles
  • Minimal components
  • Easily field redressed
  • Long, low-stress slips
  • Modular and adjustable slip designs, if required


  • Standard wireline operations
  • Flow tube manipulation achieved with minimal wireline operation
  • All tool components collapse within the outside diameter
  • Used with smooth-bore safety valve flow tubes


  • TRSV flow tube exercise or shifting

Sentinel Flow Tube Exercise Tool Engineering Data

Tubing size

2.875 in. (73.03 mm)

3.500 in. (88.90 mm)

Max. OD

2.298 in. (58.37 mm)

2.395 in. (59.92 mm)

2.796 in. (71.02 mm)

2.859 in. (72.62 mm)

Polished bore diameter

2.250 in. (57.15 mm)

2.313 in. (58.75 mm)

2.750 in. (69.85 mm)

2.813 in. (71.45 mm)

Overall length

63.64 in. (161.65 mm)

63.64 in. (161.65 mm)


42.50 lb (19.27 kg)

89.56 lb (40.62 kg)

  • TRSV Flow Tube Exercise Tool (FTET) Data Sheet
A subsurface safety valve TRSV Flow Tube exercise tool sits in a display case at an event

Related Products

Contact Us

Please provide specific location and contact information so we can expedite your request.