Adsorption behavior of polymer-based drilling fluids on SiO2

Química Nova

Petri, Denise F. S.¹  Biscaia Jr, Evaristo Chalbaud¹  Queiroz Neto, João C.¹ 

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 been often applied in horizontal wells of petroleum reservoirs in Campos, Rio de Janeiro. The present study aimed to understand the mechanism of adsorption and desorption of the drill-in fluid, xanthan, modified starch and lubricant on SiO2 by means of ellipsometry. The effect of pH and brine on the mean thickness (D) of adsorbed layer was systematically investigated. The adsorption was mainly favored under alkaline conditions. A model has been proposed to explain this effect. The adsorption isotherms determined separately for xanthan and starch on SiO2 surfaces could be fitted with the Langmuir model, which yielded similar adsorption constant values.

【 授权许可】

Unknown