Volume 39 Issue 2
Jun.  2022
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LI Bing.A new method for on-site PSD evaluation of oil based mud[J]. Drilling Fluid & Completion Fluid，2022, 39（2）：190-193 doi: 10.12358/j.issn.1001-5620.2022.02.010
Citation: LI Bing.A new method for on-site PSD evaluation of oil based mud[J]. Drilling Fluid & Completion Fluid，2022, 39（2）：190-193 doi: 10.12358/j.issn.1001-5620.2022.02.010
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A New Method for On-site PSD Evaluation of Oil Based Mud

doi: 10.12358/j.issn.1001-5620.2022.02.010

  • Sinopec Shengli Petroleum Engineering Co., Ltd. Southwest Branch，Chengdu，Sichuan 257500

  • Received Date: 2021-10-08
  • Rev Recd Date: 2021-12-25
  • Publish Date: 2022-06-23
    Abstract
  • Particle size distribution (PSD) has major effects on the properties of oil based drilling fluids in field operations, and the on-site determination of the solids particle sizes is therefore important to the controlling and maintenance of the drilling fluid properties. Using the PSD date of field oil based drilling fluids prior to and after passing through solids control equipment, a relationship between the solids removal efficiency of the solids control equipment and the PSD of the drilling fluids was established. The solids removal efficiency of the field solids control equipment can be obtained by measuring the solids content of a drilling fluid, and the range of the solids particle sizes can then be also determined. Field tests of different drilling fluids have shown that there is a strong correlation between the solids removal efficiency of a solids control equipment and the solids PSD, the coefficient of correlation R2 being 0.97. A field oil based drilling fluid, after passing through a set of solids control equipment, had its solids content reduced from 45.0% to 16.2%, the efficiency of solids removal was therefore 36.0%. Using the aforementioned test method, the particle size of the solids was 12.50 μm, falling in the range of particle size peaks (7.11 – 12.73 μm) obtained with laser particle size tester. These data indicate that the proposed test method has good accuracy, making it feasible to be used in measuring the solids sizes of field drilling fluids.

     

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