Insight into selection of appropriate formulation for colloidal gas aphron (CGA)-based drilling fluids
Insight into selection of appropriate formulation for colloidal gas aphron (CGA)-based drilling fluids
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DOI：
10.1007/s12182-020-00435-z
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发表时间：
2020-04
影响因子：
5.6
通讯作者：
M. Pasdar;E. Kazemzadeh;E. Kamari;M. Ghazanfari;M. Soleymani
中科院分区：
文献类型：
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作者：
M. Pasdar;E. Kazemzadeh;E. Kamari;M. Ghazanfari;M. Soleymani
应用轻质钻井液是开发枯竭油气藏的关键。近年来，基于胶体气体悬浮体(CGA)的流体由于具有控制流体损失的能力而被引入到此类应用中。在这项工作中，进行了一项全面的实验研究，通过进行静稳定性测试、流变性测试和气泡尺寸分析来选择CGA流体的最佳配方。以黄原胶聚合物、阴离子表面活性剂十二烷基苯磺酸钠(SDBS)和阳离子表面活性剂十六烷基三甲基溴化铵(CTAB)为原料制备CGAs。在实验范围内，通过增加聚合物和表面活性剂的浓度，用SDBS制备的CGA流体的性能得到了改善。然而，对于CTAB，随着聚合物浓度的增加和表面活性剂浓度的降低，表面活性得到了改善。在高浓度的CTAB中观察到白色、长毛状沉淀的形成，导致CGA流体迅速变得不稳定。此外，还观察到聚合物和表面活性剂的浓度对CGA的尺寸有显著的影响。当聚合物浓度为6.86g/L时，形成的气泡最稳定。这项研究的结果为CGA基钻井液的合适配方提供了见解，这些配方可能在钻井作业中潜在地应用。
Application of light-weight drilling fluids is essential to develop depleted hydrocarbon reservoirs. Recently, colloidal gas aphron (CGA)-based fluids have been introduced for such applications due to their ability in controlling fluid losses. In this work, a comprehensive experimental study was performed to choose the best formulation for CGA fluids by implementing static stability tests, rheological behavior measurements, and bubble size analyses of CGAs. Xanthan gum polymer and sodium dodecyl benzene sulfonate (SDBS), an anionic surfactant, and cetyl trimethyl ammonium bromide (CTAB), a cationic surfactant, were utilized to prepare CGAs. For the range of experiments conducted, the performance of CGA fluids prepared with SDBS was improved by increasing the polymer and surfactant concentrations. However, for CTAB, it was improved by an increase in the polymer concentration and a decrease in the surfactant concentration. The formation of white, long hair-like precipitates observed at high levels of CTAB caused CGA fluid to become rapidly unstable. Also, it was observed that the size of CGAs was significantly influenced by the polymer and surfactant concentrations. The most stable bubbles were formed at 6.86 g/L of polymer concentration. The results of this study provide insights into appropriate formulation for CGA-based fluids which could be potentially applicable in drilling operations.