Cemented Initiation Sub: Hydraulically Activated Toe Port for Cemented Wellbores

Cemented Initiation Sub


Tartan’s patented Cemented Initiation Sub (CIS) is a simple, reliable hydraulically activated toe port that provides the ability to initiate stimulation operations in cemented horizontal wellbores. The CIS eliminates the coiled tubing conveyed perforating (TCP) run for first stage initiation in plug-and-perf operations. No communication with the wellbore exists until the BurstPoint™ ports are opened, which is immediately followed by the fracturing process. This enables a quick start to fracturing the well, resulting in increased efficiency and reduced costs.


  • Simple, reliable and rugged design for cemented liner installations
  • Eliminates coiled tubing and perforating costs for first stage initiation in plug-and-perf operations
  • Can also be used as a flow path to initiate Tartan’s cemented MultiFrac™ or EnerFrac™ ball-drop systems
  • Can pump full stimulation treatment through BurstPoint ports for first stage stimulation

Features and Benefits

  • Provides increased operational efficiency resulting in reduced costs
  • BurstPoint ports within the CIS can be sized to control the stimulation fluid rate
  • Full drift ID – no drill out required
  • No special cementing procedures required
  • Surface pressure indication is an accurate monitor of BurstPoint port opening

Tartan Energy Group Case Studies

At Tartan Energy Group, we design our tools with reliability, flexibility, and simplicity in mind. To learn more about the successful application of our completion technologies, please read our case studies.

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