| Autor: |
Sara L. Moya, A. Garcia, Edgar Santoyo, G. Espinosa, S Santoyo-Gutiérrez |
| Rok vydání: |
2001 |
| Předmět: |
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| Zdroj: |
Applied Thermal Engineering. 21:283-302 |
| ISSN: |
1359-4311 |
| DOI: |
10.1016/s1359-4311(00)00003-x |
| Popis: |
With the goal of increasing understanding of drilling fluid temperature behaviour during geothermal well drilling operations, and for providing a database for a better development of numerical wellbore simulators, an experimental work based on a rheological evaluation of drilling fluids was carried out. High-temperature drilling fluid systems (HTDFS) which are most commonly used in the Mexican geothermal well drilling industry were selected and evaluated. Eleven water-based drilling fluids were formulated and chemically characterised in order to carry out the rheological evaluation. Dynamic experimental tests considering the non-Newtonian behaviour of such HTDFS were performed using a coaxial cylinder-type viscometer (Fann 50C). Drilling fluid viscosities in a programmed temperature range of 25–180°C (at a constant reservoir pressure and a shear rate of 3448.2 kPa and 170 s −1 , respectively) were measured. These dynamic viscosity measurements were then fitted to derive correlating equations for determining the drilling fluid viscosity as a function of temperature. Details of the experimental rheological tests including a complete description of the equipment and all the HTDFS used as well as the derived viscosity–temperature equations are presented. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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Full Text from ScienceDirect