HPI Thru-Tubing Release Systems (TTRS) allow users to disengage the upper portion of an E-line toolstring from the lower portion. Users have the option to disengage at any time while in the well. TTRS allow users to release from stuck tools, avoid fishing jobs and retrieve expensive wireline tools i.e., shooting gamma guns, CCLs, weight bars, etc. TTRS are easily redressed and reused in the field.

Typical reasons to disengage are; a stuck toolstring, a toolstring not able to re-enter tubing, features developing on the lower portion of the toolstring, features that make it preferable to drop the lower portion to bottom, e.g., bowed perforating guns, burrs on perforating guns, stuck anchor buttons on chemical cutters, swollen cutters and severing tools, etc.

HPI offers selective and automatic TTRS. Selective models release upon command, i.e., the E-Line operator sends a signal to disengage. Automatic models are placed at the top of perforating guns and cutters. They automatically disengage when the tool fires. Once a TTRS has disengaged the lower tool portion is left behind with a standard fishing profile looking back to the surface.

HPI offers numerous release systems:

• Light-duty systems (LD-TTRS) are used with wire guns, strip guns, and small diameter chemical cutters and severing tools.
  

• Medium-duty systems (MD-TTRS) are used with short and long RTG perforating guns, and all sizes of wire guns, strip guns, severing tools and cutters.
  

• HP/HT systems (HP/HT-TTRS) are used in extreme service conditions up to 25,000 psig (1,724 bar) and/or 500°F (260°C).
  

• Heavy-duty systems (HD-TTRS) are used with 3-3/8” to 7” hollow carrier guns and large diameter cutters (Contact HPI for more information on this tool).