<p>With the strengthening of exploration and development of deep strata and offshore oil and gas resources, more and more deep wells and deep-water wells have put forward higher requirements for drilling fluid performance. The high-temperature high-pressure of deep well and the low temperature environment of deep well have important influence on the rheology and density of drilling fluid. A new method for calculating the rheology and density of high -temperature high-pressure （HTHP） drilling fluid is proposed and studied in this paper. In this paper, the HTHP rheological data are used to predict the shear stress under different shear rates, and then the wellbore rheological parameters are predicted and analyzed. For the calculation of drilling fluid density, the classical component method static density calculation model established by Hoberock model based on drilling fluid components is analyzed and improved in this paper. The obtained model predicts that the maximum absolute error of drilling fluid density under different temperature and pressure is 0.02 g/cm3, and the absolute error is controlled within 2 %. Using this new method of predicting wellbore rheological parameters, the rheological performance distribution curve of wellbore drilling fluid during drilling can be predicted through high-temperature high-pressure rheological experimental data, which provides basic parameters for improving the accuracy of wellbore pressure calculation in controlled pressure drilling.</p>

Research on Calculation Method of Density and Rheology of High-Temperature High-Pressure Drilling Fluid_x000B_

Paper Proceedings: https://asmedigitalcollection.asme.org/OMAE/OMAE2021/volume/85116

OMAE 2021

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