Mechanical and microscopic properties of API G cement after exposed to the supercritical CO2

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Abstract

An experiment on API G-level(American Petroleum Institute) cement is conducted after curing under a supercritical carbon dioxide environment. First, cement paste is prepared to generate a uniaxial compressive specimen, after which the specimen is exposed to the supercritical carbon dioxide environment (temperature = 70 °C; pressure = 20 MPa) for curing at different numbers of days (7∼84 days). Subsequently, the physical and chemical changes in the cement are simulated at 1500∼2000 m below the injection well during CO2 sequestration. Results show that the uniaxial compressive strength of the specimen decreases as the number of curing days increases, indicating that the specimen sustains considerable damage when cured under humid environments. This result also implies a declining trend in the longitudinal and transverse waves of the cured specimen. On the basis of the analytical results for the materials, we determine that carbon dioxide reacts with the calcium hydroxide, water, and calcium silicate in the cement. The carbon dioxide is then converted into calcium carbonate and results in different degrees of carbonization depending on the number of curing days.

Original languageEnglish
JournalTerrestrial, Atmospheric and Oceanic Sciences
Volume28
Issue number3
DOIs
Publication statusPublished - 2017 Jun 1

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cement
carbon dioxide
calcium
humid environment
compressive strength
calcium carbonate
carbon sequestration
hydroxide
silicate
petroleum
well
damage
experiment
temperature
water

All Science Journal Classification (ASJC) codes

  • Oceanography
  • Atmospheric Science
  • Earth and Planetary Sciences (miscellaneous)

Cite this

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title = "Mechanical and microscopic properties of API G cement after exposed to the supercritical CO2",
abstract = "An experiment on API G-level(American Petroleum Institute) cement is conducted after curing under a supercritical carbon dioxide environment. First, cement paste is prepared to generate a uniaxial compressive specimen, after which the specimen is exposed to the supercritical carbon dioxide environment (temperature = 70 °C; pressure = 20 MPa) for curing at different numbers of days (7∼84 days). Subsequently, the physical and chemical changes in the cement are simulated at 1500∼2000 m below the injection well during CO2 sequestration. Results show that the uniaxial compressive strength of the specimen decreases as the number of curing days increases, indicating that the specimen sustains considerable damage when cured under humid environments. This result also implies a declining trend in the longitudinal and transverse waves of the cured specimen. On the basis of the analytical results for the materials, we determine that carbon dioxide reacts with the calcium hydroxide, water, and calcium silicate in the cement. The carbon dioxide is then converted into calcium carbonate and results in different degrees of carbonization depending on the number of curing days.",
author = "Kuo, {C. C.} and Chein-Lee Wang and Hsing-I Hsiang",
year = "2017",
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AU - Kuo, C. C.

AU - Wang, Chein-Lee

AU - Hsiang, Hsing-I

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Y1 - 2017/6/1

N2 - An experiment on API G-level(American Petroleum Institute) cement is conducted after curing under a supercritical carbon dioxide environment. First, cement paste is prepared to generate a uniaxial compressive specimen, after which the specimen is exposed to the supercritical carbon dioxide environment (temperature = 70 °C; pressure = 20 MPa) for curing at different numbers of days (7∼84 days). Subsequently, the physical and chemical changes in the cement are simulated at 1500∼2000 m below the injection well during CO2 sequestration. Results show that the uniaxial compressive strength of the specimen decreases as the number of curing days increases, indicating that the specimen sustains considerable damage when cured under humid environments. This result also implies a declining trend in the longitudinal and transverse waves of the cured specimen. On the basis of the analytical results for the materials, we determine that carbon dioxide reacts with the calcium hydroxide, water, and calcium silicate in the cement. The carbon dioxide is then converted into calcium carbonate and results in different degrees of carbonization depending on the number of curing days.

AB - An experiment on API G-level(American Petroleum Institute) cement is conducted after curing under a supercritical carbon dioxide environment. First, cement paste is prepared to generate a uniaxial compressive specimen, after which the specimen is exposed to the supercritical carbon dioxide environment (temperature = 70 °C; pressure = 20 MPa) for curing at different numbers of days (7∼84 days). Subsequently, the physical and chemical changes in the cement are simulated at 1500∼2000 m below the injection well during CO2 sequestration. Results show that the uniaxial compressive strength of the specimen decreases as the number of curing days increases, indicating that the specimen sustains considerable damage when cured under humid environments. This result also implies a declining trend in the longitudinal and transverse waves of the cured specimen. On the basis of the analytical results for the materials, we determine that carbon dioxide reacts with the calcium hydroxide, water, and calcium silicate in the cement. The carbon dioxide is then converted into calcium carbonate and results in different degrees of carbonization depending on the number of curing days.

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