Adsorption behavior of polymer-based drilling fluids on SiO2

Quimica nova

关键词: adsorption;    xanthan;    starch.;   

DOI  :  10.1590/S0100-40422007000400028

学科分类：化学（综合）

来源: Sociedade Brasileira de Quimica

【 摘 要 】

Polysaccharide-based drilling fluids have beenoften applied in horizontal wells of petroleum reservoirs in Campos, Rio deJaneiro. The present study aimed to understand the mechanism of adsorption anddesorption of the drill-in fluid, xanthan, modified starch and lubricant onSiO2 by means of ellipsometry. The effect of pH and brine on themean thickness (D) of adsorbed layer was systematically investigated. The adsorptionwas mainly favored under alkaline conditions. A model has been proposed to explainthis effect. The adsorption isotherms determined separately for xanthan andstarch on SiO2 surfaces could be fitted with the Langmuir model,which yielded similar adsorption constant values.

【 授权许可】

CC BY