Tuned® Defense™ Cement Spacer

Tuned Defense

Tuned® Defense™ cement spacer is the next generation Halliburton spacer built on the leading performance of the Tuned® spacer family, now with the superior capability to help prevent lost circulation while cementing.

Reduce risk of losses and help lower NPT
Lost circulation is a common challenge while drilling and cementing, and is the largest contributor to non-productive time (NPT). Losses during primary cementing can cause low top of cement, added rig time, costly remediation and/or sustained casing pressure. This innovative cement spacer is tailored to help minimize such risks by reducing the permeability of pores and fractures.

Control rheological behavior to enable dependable barriers
The critical importance of fluid rheologies for optimum mud removal has been proven through 100 years of Halliburton solving challenges. The Tuned® Defense™ cement spacer has an easily adjustable yield point to achieve rheological hierarchy and enable a dependable barrier.


  • Helps eliminate circulation losses and cement fallback
  • Optimized fluid rheology
  • Non-damaging to the formation
  • Operations up to 325°F/163°C* and 19 lb/gal
  • Enhanced to treat severe losses with BridgeMaker II lost circulation material (LCM)


  • Provides effective mud displacement
  • Helps achieve planned top of cement in challenging well conditions
  • Enables a dependable barrier to maximize production
  • Minimizes NPT while drilling and cementing

*Defense Mod™ 325 additive may be added above 300°F/149°C 

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