Laboratory Study on Thermal Damage of Formation Properties During#br#
Steam Injection in Heavy Oil Reservoirs

doi:10.11885/j.issn.1674-5086.2013.09.03.01

Abstract

Abstract:

For the problem of thermal damage from steam injection in heavy oil reservoir，the influence of thermal fluids
（high temperature and high pH）on absolute permeability is researched in unconsolidated sandstone. Displacement experiments
are employed to investigate solid-particle migration and permeability variation during hot steam condensate injection
in unconsolidated sandstone. The experiments of hydrothermal reaction are conducted to analyze the migration mechanism
of solid particles during steam injection in unconsolidated sandstone. The results shows that formation permeability gradually
decreases as temperature and pH level increases. At high flow rate，steam and its condensate causes solid-particle migration
and retention to largely decrease formation permeability. Meanwhile，under the condition of elevated temperature and high
pH level，steam condensate accelerates expansion of clay minerals and causes solution and conversion of formation minerals.
Therefore，formation damage is greatly increased resulting from mechanical effects and hydrothermal reactions in heavy oil
reservoirs.

Key words: heavy oil reservoir, thermal damage, solid-particle migration, hydrothermal reaction, laboratory study

CLC Number:

TE345

Pang Zhanxi1*, Qi Chengxiang2, Jing Feng3. Laboratory Study on Thermal Damage of Formation Properties During#br# Steam Injection in Heavy Oil Reservoirs[J]. 西南石油大学学报(自然科学版), DOI: 10.11885/j.issn.1674-5086.2013.09.03.01.

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Laboratory Study on Thermal Damage of Formation Properties During#br# Steam Injection in Heavy Oil Reservoirs

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