Downhole Products' EXPAND-O-LIZER ES (Extreme Service) is the patented, engineered solution for a complete under-reamed casing operation, ensuring the best possible conditions for cement placement. A one piece spring steel unit eliminated welded bows, the ES combines extremely robust manufacture with a proven drag reduction method of deployment.


  • The engineered solution for under-reamed hole applications where annual clearance is greater than 1-1/4”
  • Non-welded blades, robust design
  • Unique design significantly reduces running forces in cased hole sections
  • Integral bi-directional drive collar complete with engineered high holding force set screws
  • Providing excellent standoff in the open hole sections
  • Testing criteria surpassing API requirements
  • Offering the best possible conditions for cement placement in the under-reamed hole section


  • Dedicated engineering support team
  • Centralizer placement/T&D analysis available
  • Sizes from 4-1/2” through 28”

For specifications, application solutions, and EXPAND-O-LIZER ES availability, please contact your local Downhole Products representative.