Reverse-Circulation Cementing and High Performance Geothermal Cements

Presenter: Rafael Hernández

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Overview

Reverse Circulation CementingAdvantages of Reverse Circulation CementingChallenges of Reverse Circulation Cementing

Geothermal CementsFoamed Cement

Properties

Latex Cement CaP Cement

Summary

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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

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Reverse Circulation Advantages

Reduced ECDReduced job pump timeShorter slurry thickening times Improved early compressive-strength developmentImproved environmental management Easier cement-slurry selection and design

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Reverse Circulation Advantages

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Conventional vs. Reverse ECDs

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Reverse Circulation Challenges

Determining cement locationRig upJob design and executionFloat equipmentExperience

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Geothermal Cements

Foamed Cement

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Geothermal Cements

Foamed Cement PropertiesLight weightEnergizedImproved displacementDuctilyLow fluid lossNo free waterVariable densityGas migration control

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Foamed Cement Properties

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Foamed Cement Properties

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Geothermal Cements

Latex CementImproved acid resistanceFluid-loss control Excellent wetting propertiesImproved bondingIncreased resiliencySlows CO2 attack

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CaP Cement (Calcium Aluminate Phosphate cement )

CO2 resistantNot subject to corrosionNot subject to strength retrogresionDoes not shrinkGood bonding propertiesTested @ 700 F

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Geothermal Cements

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Geothermal Cements

Neat Class G cement

CaPcement

After 3 months CO2 exposure @ 200F and 2000psi

Latex cement

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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

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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