Advanced Cementing Solutions

ThermaLockTM CementFor Corrosive CO2 Environments

• Resists corrosion caused by CO2

• Protects pipe and casing

• Good for all temperatures

• Non-Portland cement formulation

• High strength development and weight retention

The Challenge: Eliminate CementCarbonationCarbon dioxide (CO2) is a common element in downholefluids, whether naturally occurring in ground waters or theresult of CO2 injection processes. When CO2 comes intocontact with the Portland cement that is used to cementwell casings, it produces a deterioration phenomenon in thecement called carbonation. Over time, the loss of cementdue to carbonation can cause serious damage to downholetubulars and destroy zonal isolation integrity, resulting incostly remedial services or even abandonment of a well.

The Solution: Develop A CO2-ResistantFormulationThermaLockTM cement is a specially formulated calciumphosphate cement that is both CO2 and acid resistant.Originally developed jointly by Halliburton, BrookhavenNational Laboratory, and Unocal for high temperature,geothermal wells, ThermaLock is now being promoted asan alternative for Portland cement wherever CO2 may beencountered. It has been laboratory tested and proven attemperatures as low as 140oF and as high as 700oF. Undertest conditions that cause Class G, H, and latex-containingPortland cements to lose up to half their weight,ThermaLock’s properties are only slightly affected or mayactually improve. (See chart on back)

Bottom-Line Benefits For Operators• Greatly reduces concerns about the long-term affects of

CO2 and acid in operators’ wells

• Saves high remedial operation costs

• Saves abandonment, redrilling, and recompletion costs

• Doesn’t require special cementing equipment ortechniques

• Greatly expands operators’ cementing options andopportunities for new applications

Proven in Indonesia and JapanDuring the field testing of the new calcium phosphateformulation, Unocal used ThermaLock cement on severalgeothermal wells in Indonesia. The largest of eight jobsused about 600 bbl of slurry. The slurry’s density was 14.7lb/gal with a yield of 2.74 ft3 per sack (100 lb). Bottomholecirculating temperatures ranged from 110oF to 150oF.Bottomhole static temperatures ranged from 150oF to 300oF.Unocal claimed 100% success on all eight jobs.

At a site in Japan, the slurry density was lowered to 11.4 lb/gal through the addition of Spherelite. Bottomhole circulat-ing temperature was 210oF. Because of ThermaLock’scorrosion resistant properties and successful placement, theoperator—JGK—plans to use ThermaLock on its next steamproducing well.

A visual comparison of ThermaLock cement (right) and Portland cement(left) shows how CO2 deteriorates Portland cement over time, whileleaving ThermaLock cement virtually unaffected.

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© 1999 Halliburton Energy Services, Inc. All Rights Reserved Printed in U.S.A.

Sales of Halliburton products and services will be in accord solely with the terms and conditionscontained in the contract between Halliburton and the customer that is applicable to the sale.

H01458R 06/99

To learn more about Halliburton’s new ThermaLockcement, contact your local Halliburton

representative—your Solution ConnectionSM.

www.halliburton.com

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Days of Exposure

ThermaLock Latex Class H

-500 20 40 60

-40

-30

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Weight Change vs Time in 140˚F Acidic CO2 Solution

This chart shows the results of ThermaLock cement tested against neat Class H cement and Class H cement containing 2 gal oflatex additive.