Volume 32 Issue 2
Mar.  2015
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Article Navigation >  DRILLING FLUID & COMPLETION FLUID  > 2015  >  32(2): 64-66,71
YAN Siming, WANG Fuhui, GAO Jin, LI Xingwu, LIAO Yongmei. Study on Working Mechanism of Oil Well Cement Retarder BH[J]. DRILLING FLUID & COMPLETION FLUID, 2015, 32(2): 64-66,71. doi: 10.3969/j.issn.1001-5620.2015.02.017
Citation: YAN Siming, WANG Fuhui, GAO Jin, LI Xingwu, LIAO Yongmei. Study on Working Mechanism of Oil Well Cement Retarder BH[J]. DRILLING FLUID & COMPLETION FLUID, 2015, 32(2): 64-66,71. doi: 10.3969/j.issn.1001-5620.2015.02.017
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Study on Working Mechanism of Oil Well Cement Retarder BH

doi: 10.3969/j.issn.1001-5620.2015.02.017

  • Southwest Petroleum University, Xindu District, Chengdu, Sichuan 610500, China

  • Received Date: 2015-01-22
  • Publish Date: 2015-03-31
    Abstract
  • The reaction mechanism of the hydration process of oil well cement in induction period, and the effect of an oil well cement retarder, BH, (a long branched chain carbonic acid, sulfonic acid) on the induction period were studied through a series of laboratory experiments. Ca(OH)2 content in the cement clinker at the early hydration stage was about 2%, and went up to 45% at the end of the induction period. This indicates that the induction period is controlled by the concentration of Ca(OH)2 in the liquid phase. BH can be adsorbed fast on the surface of cement particles to form a wrapping layer, retarding further hydration of cement. The complexion of Ca2+ by BH increased the super-saturation solubility of Ca(OH)2 to 1.97 g/mL, inhibiting the formation of Ca(OH)2 crystal nucleus and prolonging the induction period of the cement slurry. SEM charts show that BH changed the appearance of the Ca(OH)2 crystals and inhibited its growth, further prolonging the thickening time, and retarding the hydration of cement.

     

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