Volume 32 Issue 2
Mar.  2015
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DU Zicheng, SU Jun, ZENG Ran, YANG Jian, CHEN Dajun. Study on In-situ Authigenic Sealing Diverter Acid[J]. DRILLING FLUID & COMPLETION FLUID, 2015, 32(2): 79-80,84. doi: 10.3969/j.issn.1001-5620.2015.02.021
Citation: DU Zicheng, SU Jun, ZENG Ran, YANG Jian, CHEN Dajun. Study on In-situ Authigenic Sealing Diverter Acid[J]. DRILLING FLUID & COMPLETION FLUID, 2015, 32(2): 79-80,84. doi: 10.3969/j.issn.1001-5620.2015.02.021
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Study on In-situ Authigenic Sealing Diverter Acid

doi: 10.3969/j.issn.1001-5620.2015.02.021

  • A114 of Mingde Building, Southwest Petroleum University, Xindu District, Chengdu, Sichuan 610500, China

  • Received Date: 2014-12-13
  • Publish Date: 2015-03-31
    Abstract
  • A new diverter acid was developed through precipitation reaction between the hydrolysis product of acid chemicals and calcium ions. Laboratory study on the diverter acid showed that this diverter acid had better retarding performance and lower corrosivity than hydrochloric acid. Testing of the diverter acid on medium to low permeability carbonate rock samples showed a diverting capacity of 15%, five times that of hydrochloric acid; the viscosity of the residue diverter acid was almost equal to that of clear water, and the oil-water interfacial tension was less than 10 mN/m, meaning that the diverter acid can be easily removed by backflow. Experiment on the diverter acid with SEM and XRD showed that the diverter acid produced some calcium sulphate (CaSO4·2H2O), which retarded the reaction between acid and rocks, thus pushed the flow of the acid to low permeability area. The use of in-situ authigenic sealing diverter acid makes an even distribution of the acid fluid.

     

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