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Reverse-Circulation Cementing and High Performance Geothermal Cements
Presenter: Rafael Hernández
© 2009 Halliburton. All Rights Reserved. 2
Overview
Reverse Circulation CementingAdvantages of Reverse Circulation CementingChallenges of Reverse Circulation Cementing
Geothermal CementsFoamed Cement
Properties
Latex Cement CaP Cement
Summary
© 2009 Halliburton. All Rights Reserved. 3
Reverse Circulation CementingIn conventional cementing, the spacers and cement are pumped down the casing or tubing and the drilling fluid is returned through the annulus
In reverse cementing, the spacers and cement are pumped down the annulus directly and the drilling fluid is returned through the casing or tubing
© 2009 Halliburton. All Rights Reserved. 4
Reverse Circulation Advantages
Reduced ECDReduced job pump timeShorter slurry thickening times Improved early compressive-strength developmentImproved environmental management Easier cement-slurry selection and design
© 2009 Halliburton. All Rights Reserved. 5
Reverse Circulation Advantages
© 2009 Halliburton. All Rights Reserved. 6
Conventional vs. Reverse ECDs
© 2009 Halliburton. All Rights Reserved. 7
Reverse Circulation Challenges
Determining cement locationRig upJob design and executionFloat equipmentExperience
© 2009 Halliburton. All Rights Reserved. 8
Geothermal Cements
Foamed Cement
© 2009 Halliburton. All Rights Reserved. 9
Geothermal Cements
Foamed Cement PropertiesLight weightEnergizedImproved displacementDuctilyLow fluid lossNo free waterVariable densityGas migration control
© 2009 Halliburton. All Rights Reserved. 10
Foamed Cement Properties
© 2009 Halliburton. All Rights Reserved. 11
Foamed Cement Properties
© 2009 Halliburton. All Rights Reserved. 12
Geothermal Cements
Latex CementImproved acid resistanceFluid-loss control Excellent wetting propertiesImproved bondingIncreased resiliencySlows CO2 attack
© 2009 Halliburton. All Rights Reserved. 13
CaP Cement (Calcium Aluminate Phosphate cement )
CO2 resistantNot subject to corrosionNot subject to strength retrogresionDoes not shrinkGood bonding propertiesTested @ 700 F
© 2009 Halliburton. All Rights Reserved. 14
Geothermal Cements
© 2009 Halliburton. All Rights Reserved. 15
Geothermal Cements
Neat Class G cement
CaPcement
After 3 months CO2 exposure @ 200F and 2000psi
Latex cement
© 2009 Halliburton. All Rights Reserved. 16
Benefits of CaP Cement
Thermo-Gravimetric Spectra
500 550 600 650 700 750 800 850 900 950 1000
Temp (C)
CorrosaCem Neat G (15.8) ultra-low permLatex Cement CaP CementNeat G
© 2009 Halliburton. All Rights Reserved. 17
Summary
RCC is a viable option available to the geothermal industryRCC is becoming a common and acceptable cementing techniqueRCC can be the best method used to cement a wellRCC can increase the chances of achieving good zonal isolationMechanical properties of foamed cement may enhancethe life of the wellGeothemal cements may reduce CO2 attack effects