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The Atmospheric Consistometer is one of the staples of the cement lab. Every cement lab needs at least one for a critical step in preparing cement slurry for further testing.

Conditioning a cement slurry in an Atmospheric Consistometer simulates the action of pumping the slurry down the wellbore. The stirring motion and elevated temperature add enough energy to the slurry to appropriately mimic the pumping environment. And, by following the recommended practice published by the American Petroleum Institute (API), the Atmospheric Consistometer helps ensure your tests are consistent and repeatable.

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Once dry cement is mixed with water, a complex chemical reaction begins. The chemical reactions have a tremendous effect on the physical performance properties of the cement slurry. The addition of other chemicals to the cement mixture further complicates the reaction process as these additives affect the slurry properties. Blends are modified in order to increase or decrease the thickening time, alter the rheologies, or change the fluid loss properties.

Laboratories need the capacity to gauge the performance of the cement slurry in order to accurately predict how that slurry will perform under conditions that are found in an oil well. One of the tools that technicians have at their disposal to prepare slurries for additional testing is the atmospheric consistometer. Originally conceived as an instrument to test the thickening time of cement slurries, the atmospheric consistometer is often used to condition the slurry for additional testing.

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To define the physical properties of a cement slurry, laboratory personnel need to run a complete suite of performance tests. To produce consistent test results that inform how the slurry will perform under field conditions, technicians need to treat the slurry in a manner that is similar to those conditions found downhole. Atmospheric Consistometers are the ideal tool that enables technicians to condition the target slurry for further testing.

Atmospheric Consistometers are a fundamental piece of laboratory equipment. Designed to conform to API Spec 10A/10B2 standards, the Consistometers utilize a heated mineral oil bath to maintain the temperature of the slurry within 2°F (1°C) of the set point. The slurry is conditioned at temperature by rotating at 150 rpm for the duration of the conditioning period.

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