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Influence of solids concentration and solid/polymer interaction on the apparent viscosity of drilling fluids
Brazilian Journal of Chemical Engineering ( IF 1.2 ) Pub Date : 2020-10-23 , DOI: 10.1007/s43153-020-00072-4
Victor Gabriel de Paula Saide , Beatriz Rosas de Oliveira , Camila Santos do Nascimento , Rodrigo Fernando de Oliveira Borges , Cláudia Miriam Scheid , Luís Américo Calçada

Drilling fluids perform several functions such as lubrication and cooling of the drill bit, carrying the cuttings to the surface and also maintaining the stability of the well. The physicochemical characteristics of solid particles affect the drilling fluid properties, such as density, chemical composition, and surface charge. In this research, the effects of concentration, surface charge, and adsorption of different solid additives (Barite, Calcite, and Glass spheres) in carboxymethylcellulose (CMC) aqueous solutions were evaluated to quantify its influence on the apparent viscosity of drilling fluids. A study of the polymer hydration time was also carried out. The suspensions were characterized and analyzed by the rheological parameters, the morphology, the surface charge, and the chemical composition. The results showed that suspensions with solids concentration higher than 25% (m/v) presented an increase of the frictional effect of solids, leading to a significant increase in the apparent viscosity of the suspensions. The morphology of the glass spheres facilitated the fluid flow, leading to the lowest apparent viscosity among the suspensions. Ca2+ ions from calcite solids reduced the energy barrier against flocculation, making the apparent viscosity of calcite suspensions the highest. The barite suspensions showed the highest zeta potential value (in modulus) among all suspensions. The appearance of two bands related to the carbonyl in the FTIR spectrum of barite suspensions proves chemical adsorption with the CMC polymer, justifying its lower apparent viscosity compared to calcite suspensions.

中文翻译:

固体浓度和固体/聚合物相互作用对钻井液表观粘度的影响

钻井液具有多种功能,例如润滑和冷却钻头、将钻屑带到地面以及保持井的稳定性。固体颗粒的物理化学特性会影响钻井液的特性,如密度、化学成分和表面电荷。在这项研究中,评估了羧甲基纤维素 (CMC) 水溶液中不同固体添加剂(重晶石、方解石和玻璃球)的浓度、表面电荷和吸附的影响,以量化其对钻井液表观粘度的影响。还进行了聚合物水合时间的研究。通过流变学参数、形态、表面电荷和化学成分对悬浮液进行表征和分析。结果表明,固含量高于25%(m/v)的悬浮液呈现出固体摩擦效应的增加,导致悬浮液的表观粘度显着增加。玻璃球的形态有利于流体流动,导致悬浮液中最低的表观粘度。方解石固体中的 Ca2+ 离子降低了抗絮凝的能垒,使方解石悬浮液的表观粘度最高。重晶石悬浮液在所有悬浮液中显示出最高的 zeta 电位值(模量)。重晶石悬浮液的 FTIR 光谱中与羰基相关的两条带的出现证明了 CMC 聚合物的化学吸附,证明其与方解石悬浮液相比具有较低的表观粘度。
更新日期:2020-10-23
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