Volume 38 Issue 1
Aug.  2021
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LI Zhaochuan, ZHENG Lihui, WU Tong, HUANG Weian. A New Method of Measuring Rheological Properties of Drilling Fluids with Marsh Funnel Viscometer[J]. DRILLING FLUID & COMPLETION FLUID, 2021, 38(1): 54-61,67. doi: 10.3969/j.issn.1001-5620.2021.01.009
Citation: LI Zhaochuan, ZHENG Lihui, WU Tong, HUANG Weian. A New Method of Measuring Rheological Properties of Drilling Fluids with Marsh Funnel Viscometer[J]. DRILLING FLUID & COMPLETION FLUID, 2021, 38(1): 54-61,67. doi: 10.3969/j.issn.1001-5620.2021.01.009

A New Method of Measuring Rheological Properties of Drilling Fluids with Marsh Funnel Viscometer

doi: 10.3969/j.issn.1001-5620.2021.01.009
  • Received Date: 2020-10-17
    Available Online: 2021-08-16
  • The Marsh funnel viscometer is now used as a rheometer to measure the rheology of drilling fluids. The mathematical model obtained from the use of Marsh funnel viscometer, which has tedious calculation process and poor precision, is unable to satisfy the needs of measuring the rheological properties of the drilling fluids at rig site. This paper discusses the optimization of the mathematical models of flow coefficient, shear rate and shear stress prevailing at the borehole wall, and rheological curve for Newtonian and non-Newtonian fluids. Based on the study a new mathematical model for calculating the Newtonian viscosity, apparent viscosity, plastic viscosity and yield point was obtained. It was found that there is a strong positive correlation between the rheological curves obtained from the model for mineral oils, synthetic oil, fuel oil, follicle flushing fluid and formate drilling fluid, and the rheological curves of these fluids obtained on HAAKE MARS Model III rheometer. The errors between the Newtonian viscosity, apparent viscosity, plastic viscosity and yield point of five fluids obtained with the new model and those obtained with ZNN-6 rotational viscometer are 1.40%, 4.29%, 2.78% and 10.13%, respectively, indicating that the new model as a simple way can be used to reliably measure the rheological properties of drilling fluids and gives results that satisfy the needs of rheological design at the rig site.

     

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