Mineralogical Changes of a Well Cement in Various H2S-CO2(-Brine)Fluids at High Pressure and Temperature

NICOLAS JACQUEMET; JACQUES PIRONON; JEREMIE SAINT-MARC

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Mineralogical Changes of a Well Cement in Various H2S-CO2(-Brine)Fluids at High Pressure and Temperature

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The reactivity of a crushed well cement in contact with(1)a brine with dissolved H2S-CO2;(2)a dry H2S-CO2 supercritical phase;(3)a two-phase fluid associating a brine with dissolved H2S-CO2 and a H2S-CO2 supercritical phase was investigated in batch experiments at 500 bar and 120,200°C.All of the experiments showed that following 15-60 days cement carbonation occurred.The H2S reactivity with cement is limited since it only transformed the ferrites(minor phases)by sulfidation.It appeared that the primary parameter controlling the degree of carbonation(i.e.,the rate of calcium carbonates precipitation and CSH(Calcium Silicate Hydrates)decalcification)is the physical state of the fluid phase contacting the minerals.The carbonation degree is complete when the minerals contact at least the dry H2S-CO2 supercritical phase and partial when they contactthe brine with dissolved H2S-CO2.Aragonite(calcium carbonate polymorph)precipitated specifically within the dry H2S-CO2 supercritical phase.CSH cristallinity is improved by partial carbonation while CSH are amorphized by complete carbonation.However,the features evidenced in this study cannot be directly related to effective features of cement as a monolith.Further studies involving cement as a monolith are necessary to ascertain textural,petrophysical,and mechanical evolution of cement.

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《Environmental Science & Technology: ES&T》 |2008年第1期|282-288|共7页
作者
NICOLAS JACQUEMET; JACQUES PIRONON; JEREMIE SAINT-MARC;
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作者单位

Faculte des Sciences,Universite Nancy I,G2R-CREGU,BP 239,54506 Vandoeuvre-les-Nancy Cedex,France,and Centre Scientiflque et Technique Jean Feger,TOTAL,avenue Larribau,64018 Pau Cedex,France;

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收录信息美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
原文格式 PDF
正文语种英语
中图分类环境化学;
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Mineralogical Changes of a Well Cement in Various H2S-CO2(-Brine)Fluids at High Pressure and Temperature

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