Water-based drilling fluids: the contribution of xanthan gum and carboxymethylcellulose on filtration control
Water-based drilling fluids: the contribution of xanthan gum and carboxymethylcellulose on filtration control
复制标题
DOI：
10.1007/s11696-017-0231-7
复制
发表时间：
2017-12-01
期刊：
影响因子：
2.2
通讯作者：
Balaban, Rosangela de C.
中科院分区：
文献类型：
--
作者：
da Luz, Railson C. S.;Fagundes, Fabio P.;Balaban, Rosangela de C.
本研究主要旨在评价黄原胶（XG）和羧甲基纤维素（CMC）在水基钻井液过滤过程中的影响，考虑加入不同浓度（0.17、0.34和0.51 M）盐（NaCl）后聚电解质的构象变化。还通过添加方解石（碳酸钙，CaCO3）来评估流体的行为。制备了十六种钻井液，其黄原胶浓度相同（主要用作输送岩屑的增稠剂），但盐度不同，并且含有或不含有恒定浓度的CMC和方解石。采用这种策略来评估每种添加剂在控制过滤性能方面的真正贡献，这在论文中经常不清楚。一般来说，与用甜水制备的流体相比，用所有盐水制备的流体都表现出较低的粘度和较高的滤液损失。这种效应在仅含有 XG 的液体中更为强烈。 CMC的加入增强了粘度并减少了滤液损失。然而，当添加方解石时获得了最好的结果。结果表明，即使存在方解石，XG 作为增稠剂的贡献也不足以有效控制流体过滤。然而，XG盐溶液中添加CMC和方解石增加了粘度并显着降低了滤失量。这一结果归因于 XG、CMC 和方解石之间的协同相互作用。
This study aimed mainly to evaluate the influence of xanthan gum (XG) and carboxymethylcellulose (CMC) in the filtration process of water-based drilling fluids, considering the conformational changes suffered by the polyelectrolyte with the addition of salt (NaCl) in different concentrations (0.17, 0.34 and 0.51 M). It was also evaluated the behavior of the fluid by the addition of calcite (calcium carbonate, CaCO3). Sixteen drilling fluids were prepared with the same xanthan gum concentration (major application as thickener to transport the cuttings), but different salinities and having or not CMC and calcite at constant concentrations. This strategy was adopted to evaluate the real contribution of each additive in the control of filtration performance, frequently unclear in the papers. In general, the fluids prepared in all brines showed lower viscosities and higher filtrate loss compared to fluids of sweet water. This effect was more strong in fluids containing only XG. The addition of CMC enhanced the viscosity and reduced the filtrate loss. However, the best results were obtained when calcite was added. The results indicated that XG contribution as thickener is not enough to control efficiently the fluid filtration even in the presence of calcite. However, the addition of CMC and calcite to XG salt solution increased the viscosity and decreased significantly the filtrate loss. This result was attributed to synergistic interactions between XG, CMC and calcite.