Volume 38 Issue 6
Nov.  2021
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Article Navigation >  DRILLING FLUID & COMPLETION FLUID  > 2021  >  38(6): 698-704
ZHANG Geng, LI Jun, LIU Gonghui, et al.A precise model for prediction of annular ECD in offshore HTHP wells[J]. Drilling Fluid & Completion Fluid，2021, 38（6）：698-704 doi: 10.12358/j.issn.1001-5620.2021.06.006
Citation: ZHANG Geng, LI Jun, LIU Gonghui, et al.A precise model for prediction of annular ECD in offshore HTHP wells[J]. Drilling Fluid & Completion Fluid，2021, 38（6）：698-704 doi: 10.12358/j.issn.1001-5620.2021.06.006
shu

A Precise Model for Prediction of Annular ECD in Offshore HTHP Wells

doi: 10.12358/j.issn.1001-5620.2021.06.006
  • 1.

    College of Petroleum Engineering, China University of Petroleum (Beijing), Beijing, 102249

  • 2.

    China University of Petroleum (Beijing) Karamay Campus, Karamay Xinjiang,834000

  • Received Date: 2021-07-31
  • Accepted Date: 2021-08-11
  • Publish Date: 2021-11-30
    Abstract
  • To accurately predict the annular ECD of high temperature high pressure (HTHP) wells, a model for calculating the density and rheology of drilling fluids was established through multielement nonlinear regression based on the rheological data of drilling fluids obtained under HTHP conditions. By coupling this model with the heat transfer model of wellbore, a precise prediction model for calculating the annular ECD of drilling fluids under HTHP conditions was established. Compared with the results obtained using the Drillbench software, this model gives results that are closer to the measured PWD data. Results from the model using actual operation data showed that during drilling operation, as the temperatures in the lower part of the annulus are continuously decreasing, the density and consistency index of the drilling fluid are continuously increasing, resulting in continuous increase in the annulus ECD. The flow rate of drilling fluid and the geothermal gradient are two key factors affecting annular ECD; the higher the flow rate, the higher the annular pressure losses, and hence the higher the annular ECD. Geothermal gradient directly affects the distribution of temperatures in the annulus, and increase in the geothermal gradient results in continuous decrease in annular ECD.

     

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