To What Degree Thermal Cycles Affect Chalk Strength

Tijana Livada, Anders Nermoen, Reidar Inger Korsnes, Ida Lykke Fabricius

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Abstract

Chalk reservoirs could potentially undergo destabilization as the result of repeated cold water injection into a hot reservoir during water flooding. Preliminary results of an ongoing study are presented in this paper, which compare the impact of temperature cycling on mechanical behavior on dry and water saturated chalk. Sixty disks of dry Kansas chalk exposed to different number of temperature cycles were tested for tensile strength using a Brazilian test. Changes in elastic properties as function of number of temperature cycles of the same chalk, but now saturated in water, were studied using triaxial cell experiments. For dry rock, no significant effects of temperature cycling was found on average tensile strength, however the range of the tensile failure stress is doubled for the samples exposed to 50 temperature cycles, as opposed to those to none. For water saturated cores, the temperature cycling had a significant effect and a significant accumulative irreversible deformation was seen for the core exposed to cyclical temperature variations, so that the elastic bulk modulus consequently increased more than for a core that had been tested at constant temperature. The inconsistency of the results from the two tests suggests the importance of the pore fluid.
Original languageEnglish
Publication date2016
Number of pages7
Publication statusPublished - 2016
Event30th Society of Core Analysts' International Symposium - The Westin Snowmass Resort , Snowmass, CO, United States
Duration: 21 Aug 201626 Aug 2016
Conference number: 30

Conference

Conference30th Society of Core Analysts' International Symposium
Number30
LocationThe Westin Snowmass Resort
CountryUnited States
CitySnowmass, CO
Period21/08/201626/08/2016

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