Additives, Chemicals, Materials

Additives are chemicals and materials blended into base cement slurries to alter the performance of the cement. Due to the inherent nature of base cements (Neat, Portland and Pozzolanic) and because of the demands placed on the cement sheath throughout the life of the well, the performance properties of the cementing slurry are modified to address the specific and unique conditions of each well.

Additives are used to enhance cement slurries in all wellbore conditions. Variations in additive concentration may cause significant changes in thickening time, compressive strength, and viscosity, so determining the optimum balance of additives to achieve a reliable annular seal, particularly in extreme or corrosive downhole conditions, can be complex. Thus, field-proven technical solutions, laboratory-driven empirical data from analytical tests, and finite element analysis models play an important role when engineering an optimized slurry blend.

All of Halliburton's additive advancements were made with one goal in mind: to help operators benefit from a long-term tight annular seal and cement-sheath resilience for superior zonal isolation, even in technically demanding wells or environmentally sensitive areas. Here are some examples:
     
Additive, Chemical or Material Challenge Results
Accelerators Staged casing operations Control the time for a slurry to set.
Hydrocarbon  responsive agents Sustained casing pressure Material embedded in the sheath able to seal flow paths in and around cement sheath in the event of any flow of unwanted hydrocarbons
Dispersants Deep offshore wells
Long horizontal wells
High temperatures
Ultra-deep wells
Mix more easily and lower friction during pumping.
Fluid loss additives Deep offshore wells
Long horizontal wells
High temperatures
Ultra-deep wells
Retain proper water levels rather than allow pressure differential to reduce the water content, thus ensuring the integrity of the designs for viscosity, thickening time, rheology and compressive-strength development.
Gel strength modifiers Gas migration Shorten the transition time from slurry to hard set to resist gas channeling through the unset cement.
Latex systems High formation pressures
Corrosive elements
Reduce permeability of the cement sheath and improve the ability for solids to remain suspended in the slurry
Light-weight additives Weak formations Yield slurries 25% lighter than water yet with desired mechanical properties maintained.
Non-Portland systems Corrosive elements downhole (i.e. CO2 injector wells / CO2 storage wells) Increase resistance to corrosion that can destabilize the bonding.
Retarders Deep offshore wells
Long horizontal wells
High temperatures
Ultra-deep wells
Control the time for a slurry to remain fluid and pumpable.
Weighting agents High formation pressures Increase cement density to restrain formation-fluid flow back while improving mud displacement and cement placement.

Additives, Chemicals, Materials

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Summary SentinelCem™ Cement Cures Losses in Iraq Wells Jul 2017
Summary BaraShield®-664 & BaraLock®-666 LCMs Help Cure Total Losses & Improve Cement Job in Known Thief Zone Jun 2017
Summary Customized LCM Squeeze Pill Cures Losses in Depleted Sandstones and Eliminates Additional Trips Jun 2017
Summary WellSET® treatment helps operator avoid losses while drilling severely depleted sands Feb 2016
Summary Static loss rate drops to zero after use of DUO-SQUEEZE® R LCM pills Dec 2015
Summary Static loss rate drops 87% after use of DUO-SQUEEZE® R LCM pills Dec 2015
Summary STEELSEAL®/BARACARB® LCM pill saves $4 million on deepwater well Nov 2015
Summary STOPPIT® LCM Pills Cure Loss Rate for Oman Operator Oct 2015
Summary Combo pills provide Immediate Impact Intervention Solution through rapid seal in severe loss zone Sep 2015
Summary BARAFLAKE® acid-soluble lost circulation material pill cures losses Jul 2015
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