Volume 32 Issue 4
May  2015
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SUN Qiang, HU Jinjun, ZHANG Xinglai, XIA Xiaochun, LI Guozhao, GENG Tie. Evaluation and Field Application of Aluminum Complex as Chemical Sealing Agent[J]. DRILLING FLUID & COMPLETION FLUID, 2015, 32(4): 28-31. doi: 10.3969/j.issn.1001-5620.2015.04.008
Citation: SUN Qiang, HU Jinjun, ZHANG Xinglai, XIA Xiaochun, LI Guozhao, GENG Tie. Evaluation and Field Application of Aluminum Complex as Chemical Sealing Agent[J]. DRILLING FLUID & COMPLETION FLUID, 2015, 32(4): 28-31. doi: 10.3969/j.issn.1001-5620.2015.04.008
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Evaluation and Field Application of Aluminum Complex as Chemical Sealing Agent

doi: 10.3969/j.issn.1001-5620.2015.04.008

  • Oilfield Chemistry R&D Institute, COSL, P. O. Box 255, Beijing 101149, China

  • Received Date: 2015-04-13
  • Publish Date: 2015-07-31
    Abstract
  • This paper discusses the chemical principles of aluminum complex as chemical sealing agent. In laboratory studies, an aluminum complex, PF-ChemSeal, was evaluated using SEM for its ability in sealing pore throats and micro fractures of shales. PF-ChemSeal precipitates on the surface of shales and borehole walls to form a dense layer of aluminum complex. In dynamic pore pressure transmission studies, the semi-membrane efficiency of shales is increased to higher than 80% with the use of PF-ChemSeal. The content of PF-ChemSeal in drilling fluids can be monitored by measuring the concentration in drilling fluids of fluorine ions. PFChemSeal has been used in the Block CFD in Bohai Bay, and is well compatible with other water base mud agents. Gauge holes have been drilled with PF-ChemSeal treated muds. PF-ChemSeal minimizes the transmission of pore pressure in shales, hence making the shales more stable.

     

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