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《Oilfield Chemistry》 2005-01
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A Mechanistic Study on Early Hydration of Oil Based Cement

SONG Bi-Tao, YAO Xiao, XU Zhong-Zi (College of Materials Science and Engineering, Nanjing University of Technology, Nanjing, Jiangsu 210009 ,P R of China)  
Oil base cement slurries (OBCSs) are an excellent water shutoff agent. The early hydration of oil base oilwell cement of grade G, original as received and finely ground, is studied by using TAM Air 8 way calorimeter. The evolution of hydration heat proceeds much slower in OBCSs than in an ordinary water base slurry; the hydration heat of cement in OBCSs increases with the water to oil slurry (W/S) ratio; with finely ground cement taken in the OBCSs, the hydration of cement accelerates but the hydration heat evolved decreases. There exists a notable induction period in cement hydration in OBCSs and the larger the W/S ratio of OBCS the longer the induction period of hydration is. Mechanical measurements show that the compressional strength of hardened oil base cement varies significantly with changing the W/S ratio of OBCS and the highest strength is observed at intermediate W/S ratios of 0.2—0.3; the early stength is higher when finely ground cement is taken in preparing OBCSs. The loss on ignition measurements show that the hydration degree of hardened oil base cement is affected mainly by the W/S ratio of OBCSs and in less extent by the curing temperature and the cement fineness and is low inough, accounting 33—64% in 7 days, for the hardened cement strength to develop further in some extent.
【CateGory Index】: TE358.3;TE39
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【Co-citations】
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1 SONG Bi-tao, YAO Xiao, XU Zhong-zi(College of Materials Science & Engineering, Nanjing University of Technology, Nanjing 210009,China);Study on hydration of oil based cement slurry and its strength development[J];Journal of Nanjing University of Technology;2004-04
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