Abstract
In order to understand the rheological behavior of concentrated aqueous Algerian bentonite dispersions of drilling (sodium bentonite of Mostaganem “m’zila”), rheological tests were carried out. By varying the concentration of bentonite, flow tests have allowed to estimate the yield stress and apparent viscosity for each concentration and to see their influence on the rheological behavior of these dispersions. In addition dynamic tests (oscillatory) are used to define the linear region of our samples, the state of our fluid (elastic solid or viscous liquid) and understanding the mechanisms of structuring of the particles constituting the material. In parallel, other tests coupled with rheological measurements such as x-rays diffraction to know the mineralogical composition and granulometry to estimate the bentonite particle size.
Highlights
During oil drilling, many problems can be encountered due to the interactions between the various geological formations crossed and the drilling fluid used; this latter is formulated on the surface by using various components where bentonite is the main one for water based mud
Little research has been carried out on understanding the mechanisms of structuring of bentonite dispersions often used in drilling fluids in Algerian oil fields
It is with this objective that this study contributes by studying these mechanisms through rheological tests coupled with other methods such as X-ray diffraction (XRD) and particle size to better understand and reinforce the results obtained by identifying the origin of the observed properties
Summary
Many problems can be encountered due to the interactions between the various geological formations crossed and the drilling fluid used; this latter is formulated on the surface by using various components where bentonite is the main one for water based mud. The bentonite used in this study comes from Mostaganem (m’zila, west of Algeria) It currently indicates the name of smectites which consist essentially of montmorillonite where are found three levels of organization which are: the sheet, the primary particle and the aggregate [1]. Little research has been carried out on understanding the mechanisms of structuring of bentonite dispersions often used in drilling fluids in Algerian oil fields. It is with this objective that this study contributes by studying these mechanisms through rheological tests coupled with other methods such as X-ray diffraction (XRD) and particle size to better understand and reinforce the results obtained by identifying the origin of the observed properties
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