menu toggle
Download fact sheet
Talk to a product expert

AST TECHNOLOGY

Faster ROP, increased FOOTAGE
and reduced equipment DAMAGE from stabilizing the bit/rock interface.

The patented Tomax downhole regulator (AST) has contributed to more effective drilling in more than 12,000 wells around the world.

Our products
Calculate and order your AST

ADRIATIC SEA

BIG P&A SAVINGS REPEATED

NSC of Italy has repeated a significant step improvement in Plug and Abandonment by completing preparations for cementing in one trip using the latest generation technology from Wellbore Integrity and Tomax.

The string consisted of the Wellbore Integrity 5500 ProMILL for bridge plug setting, section milling and underreaming in one trip. This combo then had the latest generation Tomax XC-AST made up on top the same way as in open-hole drilling and under-reaming. The milling progress was very fast and revealed a big efficiency gain that was confirmed by a corresponding reduction in vibration. The latter was key to keep all tools in the BHA safe and ready for subsequent operations.

More Details in this 

Performance Bulletin (PDF)

Read field reports

Functional
Principle

The AST consists of a mechanical-hydraulic converter placed in the lower part of the drill string.

Optimized drilling process

Under normal, stable conditions, the unit will transfer torque and weight to the bit as a passive part of the Bottom Hole Assembly (BHA).

However, if the loading of the PDC bit becomes unstable, the AST regulator will apply its algorithm to stabilize the cut. The result is an optimized drilling process with less wear and vibration.

Prevents destructive vibrations

In practical terms, this means that the momentary response/closed-loop function of the AST prevents the escalation of local instabilities into destructive vibrations. The tool functions continuously, and no reset is required.

STIFF STRING

Axial excitation is how a PDC drill-bit solves overload in a conventional configuration

AST REGULATOR

The AST regulator adapts the load to the available torque. This happens in less than 30 milliseconds and provides for a steady cut

Speak to an expert
Our Value Proposal

Tomax AST downhole tool size 4 ¾” x-series

4 ¾”

X-Series

Tomax AST downhole tool size 5 ¼” x-series

5 ¼”

X-Series

Tomax AST downhole tool size 6 ¾” x-series

6 ¾”

X-Series

Tomax AST downhole tool size 7” c-series

7’’

C-Series

Tomax AST downhole tool size 8 ¼” x-series

8 ¼”

X-Series

Tomax AST downhole tool size 9 ½” x-series

9 ½”

X-Series

Downhole tool sizes

Use of the AST requires no changes to standard drilling practices. The tool has a wide working range which eliminates the need for service personnel.

See our products
Download fact sheets

12,000+

Wells operating with Tomax

In recent years, the Tomax AST has been the fastest growing new technology in deep drilling.

Please contact us or use this website to help configure the AST products into your plans.

Our Locations

Tomax in different parts of the world

Explore how Tomax supports reliable drilling performance worldwide. Each article highlights local challenges, AST solutions, field results, resources, and regional contacts.