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Behavior and Expanding Mechanism of MgO Expansive Agent at High Temperature and High Pressure
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Gang SUN1, Fengze CAO2, Yibo LIAO1, Dan DAI1, Peiyu YAN2
Journal of the Chinese Ceramic Society | 2021, 49(8) : 1683 - 1690
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Journal of the Chinese Ceramic Society | 2021, 49(8): 1683-1690
• Research Article •
Behavior and Expanding Mechanism of MgO Expansive Agent at High Temperature and High Pressure
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Gang SUN1, Fengze CAO2, Yibo LIAO1, Dan DAI1, Peiyu YAN2
Affiliations
  • 1.China Oilfield Services Limited, Sanhe 065201, Hebei, China
  • 2.Department of Civil Engineering, Tsinghua University, Beijing 100084, China

    • SUN Gang (1978-), male, Engineer. E-mail:

About Author:

SUN Gang (1978-), male, Engineer. E-mail:

Published: 2021-08-20 doi: 10.14062/j.issn.0454-5648.20200451
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High-temperature high-pressure (HTHP) working conditions of oil-well cement paste alter the expansive mechanism of MgO expansive agent, thus significantly accelerating the expansion speed and increasing the ultimate expansion. The free expansion rate of shrinkage-compensating pastes with MgO expansive agent at different contents was investigated. The microstructural characteristics, including morphology and porosity, were evaluated to reveal the expansive mechanism of MgO expansive agent in HTHP environment. It is indicated that the shrinkage of oil-well cement paste can be compensated by admixing MgO expansive agent at proper contents and reactivity. At 150℃ and 20 MPa, S-type (220 s) MgO with a relatively low reactivity is recommended and its dosage is less than 4%. At HTHP, the migration of Mg2+ from MgO particles is accelerated. Besides the formation of expanding mircocracks, Mg(OH)2 crystals also are interlocked with tobermorite crystals as a hydration product of cement, thus enlarging their gap and causing an extraordinary expansion, compared to the expansive binder cured at normal temperature and pressure.

magnesium oxide  /  expansive agent  /  oil-well cement  /  high-temperature-high-pressure environment  /  expanding mechanism
孙刚, 曹丰泽, 廖易波, 代丹, 阎培渝. 高温高压环境中MgO膨胀剂的性能与作用机理. 硅酸盐学报, 2021 , 49 (8) : 1683 -1690 . DOI: 10.14062/j.issn.0454-5648.20200451
Gang SUN, Fengze CAO, Yibo LIAO, Dan DAI, Peiyu YAN. Behavior and Expanding Mechanism of MgO Expansive Agent at High Temperature and High Pressure[J]. Journal of the Chinese Ceramic Society, 2021 , 49 (8) : 1683 -1690 . DOI: 10.14062/j.issn.0454-5648.20200451
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Year 2021 volume 49 Issue 8
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Article Info
doi: 10.14062/j.issn.0454-5648.20200451
  • Receive Date：2020-06-24
  • Online Date：2026-10-30
  • Published：2021-08-20
Article Data
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History
  • Received：2020-06-24
  • Revised：2020-12-10
Funding
Affiliations
    1.China Oilfield Services Limited, Sanhe 065201, Hebei, China
    2.Department of Civil Engineering, Tsinghua University, Beijing 100084, China

Corresponding:

YAN Peiyu (1955-), male, Ph. D., Professor. E-mail:
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表12种不同金属材料的力学参数
科
Family		 属数
Number of
genus		 种数
Number of
species		 占总种数比例
Percentage of
total species (%)		 属
Genus		 种数
Number of
species		 占总种数比例
Percentage of total
species (%)
鹅膏菌科Amanitaceae 2 11 5.26 鹅膏菌属 Amanita 10 4.78
小菇科 Mycenaceae 2 12 5.74 丝盖伞属 Inocybe 5 2.39
多孔菌科 Polyporaceae 8 14 6.70 蜡蘑属 Laccaria 5 2.39
红菇科 Russulaceae 3 23 11.00 小皮伞属 Marasmius 6 2.87
小菇属 Mycena 11 5.26
光柄菇属 Pluteus 5 2.39
红菇属 Russula 17 8.13
栓菌属 Trametes 5 2.39
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