Volume 38 Issue 6
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YANG Xin, HU Ya’nan, YAO Rugang, et al.Factors affecting colloid fraction of organophilic clay used in oil based drilling fluids[J]. Drilling Fluid & Completion Fluid，2021, 38（6）：732-737 doi: 10.12358/j.issn.1001-5620.2021.06.011
Citation: YANG Xin, HU Ya’nan, YAO Rugang, et al.Factors affecting colloid fraction of organophilic clay used in oil based drilling fluids[J]. Drilling Fluid & Completion Fluid，2021, 38（6）：732-737 doi: 10.12358/j.issn.1001-5620.2021.06.011
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Factors Affecting Colloid Fraction of Organophilic Clay Used in Oil Based Drilling Fluids

doi: 10.12358/j.issn.1001-5620.2021.06.011

  • Drilling Fluid Branch of GWDC, CNPC, Panjin, Liaoning 124010

  • Received Date: 2021-06-19
  • Accepted Date: 2021-04-19
  • Publish Date: 2021-11-30
    Abstract
  • Two organophilic clay samples (1# and 2#) were taken to study the factors affecting the colloid fraction of the clays. Factors studied include type of base oil, type and concentration of polar solvent (activator), shear rate and time of shearing. It was found that the colloid fraction (expressed as percentage) of organophilic clay 1# was 100% in 0# diesel oil, and 20% in 5# diesel oil. When different polar solvents were added to the 5# diesel oil, the colloid fraction can be increased to 100%. The colloid fractions of the organophilic clay 2# in the 0#, 3# and 5# diesels were all less than 10%. After adding polar solvent in the three diesel oils, the colloid fractions of the organophilic clay in the three diesel oils were increased at different levels. When the stirring speed of the agitator was increased from 3000 r/min to 13,000 r/min, the colloid fractions of the organophilic clays were increased from 18% to 29%. When the time of shearing was increased from 5 min to 40 min, the colloid fractions of the organophilic clays were increased from 22% to 40%. Analysis of the experimental data has revealed the mechanism on which how activator affects the colloid fraction of organophilic clays. It is suggested in this paper that the conditions under which the colloid fraction test is performed should be specified, for example, the time of shearing, stirring speed and temperature etc. These factors also affect the colloid fraction of the organophilic clay.

     

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