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4 closest

4" Cement Support Tool

  • Work String Range 4" - 6.5" ID
  • Hole / Casing Size 8" - 42" ID
The 4" Black Model is designed for larger scale operations, fitting work strings from 4" to 6.5". Its capability to support cement plugs in holes or casings sized from 8" to 42" makes it ideal for heavy-duty applications.

Choosing the right CST size is straightforward and depends on two key factors: the inner diameter of your work string and the inner diameter of the open or cased hole where the cement plug will be set.

Why should you choose CST?

High Success Rate: CST dramatically reduces the failure rate for setting cement plugs, boasting a success rate of over 95%.

Efficient and Reliable: Designed for easy pumping through long work strings, CST ensures reliable support for off-bottom cement plugs, simplifying the cementing process.

Flexibility: Available in five standard sizes and a customized version for coiled tubing, CST covers a wide range of needs in various operational scenarios.

No Extra Tools or Training Needed: CST is easy to deploy without the need for additional tools or extensive training, making it cost-effective and user-friendly.

Versatility: CST functions as a floating piston in the fluid, with no limitations on angle or depth, and has been used in hole depths greater than 7,000 meters and angles up to 90 degrees.

Quality Materials: Made of aluminum, fiberglass, and strong fabrics, CST prevents heavy cement slurry from swapping places with well fluid below the cement plug.

Globally Proven: With thousands of units deployed globally since 2002, CST is a trusted solution recognized by industry professionals worldwide.

Effective Plugging: CST expands to create a robust support base, providing effective and reliable plugging in both open and cased holes.


Want the details?

4" Cement Support Tool

Download our technical product sheet for the 4" Cement Support Tool for more insight.

Access product sheets:

4 700+ Number of CSTs delivered world wide
45+ Number of countries delivered to
97.2% Current success rate for the Cement Support Tool
FAQ for the Cement Support Tool

Curious about the questions we hear most often?

Here are some of the common questions that frequently come up. Want more detailed information or have different questions altogether?
Reach out to us - we're here to help you.

In what ways can the CST be installed in a well?
The most common way to install the CST is to pump it through the drill pipe work string before the cement is pumped downhole.
That being said, it can also be pre-installed in a pipe and run into the well in front of a coil tubing.
Can the CST be used in cased hole applications? Yes, the CST can be used in both cased hole and open hole applications.
Can the CST be used if there are washouts or uneven hole geometry?
Yes, the CST is designed to fill uneven wellbores provided the maximum wellbore diameter is smaller than the maximum hole/casing diameter for the specific CST.
Can the CST be tagged after it is deployed in the well? The CST is not designed to anchor, and tagging it might move the CST, or in worse case damage it. Hence, we do not recommend to tag the CST.
How much cement can the CST support? As the CST simply separates the cement above and the well fluid below, it can support unlimited volumes of cement.
How much differential pressure can the CST withstand? The CST does not hold differential pressure as it is designed to act as a floating piston and simply separate the cement above and the well fluid below it. The CST will therefore move slightly and find equilibrium state prior to hardening of the cement.
Can the CST be used in highly deviated and horizontal applications? Yes, the CST is not restricted by the deviation of the wellbore. When a cement plug is set in horizontal wells it is important to ensure the cement stay in place also in the top end of the cement plug. A second CST can be used for such application.
Is the CST drillable? The CST is fully drillable. Clients often report back that they didn’t even notice the CST when they drilled out the cement plug.
Can the CST be used in fluid loss applications? Yes, the CST can be set below the loss zone to help divert the loss material into the loss zone.
What is the lead time for CST supply? We normally have the CSTs ready on the shelf and since it can be airfreighted it can be expressed delivered to most location within a week.
What material is the CST made out of? The CST is mainly made out of aluminium, composite and canvas, with a few ounces of mild steel.
What is the shelf life for the CST? When the CST is stored in a dry environment inside the original shipping packaging, the shelf life is set to 5 years. After 5 years, we recommend to dispose the CST or send it back to Perigon for refurbishment.
How is the success rate calculated? Our definition is that when the cement plug is placed at desired depth and the plug’s objective is met, the cement plug is considered as success and thereby the CST has assisted in this success. The CST success rate is 97%.

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