Cement analyzer measures gas migration and compressive strength
AssigneeHongfeng BI
InventorHongfeng Bi
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Abstract
The present invention pertains to a method and experimental apparatus for studying properties of cement slurry to be used in an oil or gas well under varied pressure and temperature conditions. This apparatus can be used to predict the likelihood of gas migration, compressive strength and static gel strength of cement slurry. It comprises a servo motor and coupling magnets to drive a paddle at a very slow speed through the cement in a pressure vessel, a pair of acoustic transducers to generate an acoustic signal and measure the transit time of the acoustic signal after it transits the cement, and a gas injection system to predict the severity of gas migration in cement.
Claims6
A cement analyzer instrument is used to determine gas migration and compressive strength, including:
- a) a pressure vessel filled with a sample fluid,
- b) a gas inlet to provide gas injection,
- c) a means to measure a pressure difference of said sample fluid when said gas migrates through said sample fluid,
- d) a pair of ultrasonic transducers to generate and record an acoustic signal transmitted through said sample fluid, and
- e) a means to measure a transit time of said acoustic signal through said sample fluid.
Dependencies are inferred from the claim text.