Initiation Assembly

Stimulation of Deepest Stages in Cemented Wellbores


Tartan Completion’s Cemented Initiation Assembly enables operators to initiate stimulation operations through the toe and perform a full first-stage limited-entry stimulation in cemented wellbores. By combining Tartan’s patented Cemented Initiation Sub (CIS) and MultiFrac™ limited entry sleeves, the Initiation Assembly can be customized to the desired stimulation rate.

Since all tools — including the CIS — are incorporated into the stage design, no rock will go untreated. Because the toe stage will have the same number of points as a regular entry stage, there is no need to pump a smaller stage for the toe of the well or pump guns down to perforate the remainder of the toe/first stage.

The CIS and MultiFrac sleeves feature patent-pending BurstPoint™ ports that improve stimulation treatment placement and effectiveness and keep the system internals completely closed during installation and the cementing process, eliminating the risk of debris and cement invasion.

The MultiFrac hydro-mechanical sleeves are activated with standard or dissolvable balls and enable cluster stimulation by opening multiple sleeves with one ball. Once the sleeves are shifted, liner pressure is increased to fully open the BurstPoint ports to achieve calculated limited entry stimulation with +90% cluster efficiency.


  • Eliminates coiled tubing and perforating costs for first stage initiation in cemented wellbores
  • Enables full stimulation and production of toe zone
  • Efficient cluster stimulation of lower zones in extended reach laterals
  • Ball-drop CIS option provides ability to pressure test the liner prior to stimulation operations

Features and benefits

  • Provides increased operational efficiency resulting in reduced costs
  • BurstPoint ports can be sized to control the stimulation fluid rate on a per sleeve basis
  • BurstPoint port inserts prevent erosion, allowing cluster efficiency of +90% throughout the treatment stage
  • No communication with the annulus until BurstPoint port rupture pressure is reached
  • No special cementing procedures required
  • Surface pressure indications are an accurate monitor of tool performance

Fill out your information to receive the Initiation Assembly data sheet.

Case Studies


Tartan MultiFrac systems successfully stimulated 18 months post-install.


Tartan successfully completes cemented EnerFrac™ ball-drop systems in the Montney.


Tartan cemented MultiFrac limited entry ball-drop systems increase production by 12.5%.

What Our Customers are Saying

“EOG has dealt with Tartan Completions since 2010, during which time they provided us completions equipment and services in our Rockies Region in the USA. Tartan has helped EOG lower costs through increased efficiency and equipment reliability and have always provided knowledgeable operational support for our daily completions operations. We can confidently recommend Tartan Completions as a solid and reliable supplier, and experts in completions equipment and services.”
EOG Resources
“Tartan Completions has been providing Crescent Point Energy with downhole milling services since 2009 when they started milling out frac ports in Saskatchewan. They have completed hundreds of jobs for us and still are our trusted service provider to do milling and fishing work in both Alberta and Saskatchewan. For any company looking for downhole milling services, we highly recommend Tartan Completion’s continued repeatable and reliable services and support.”
Crescent Point Energy Group

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