Hadadi Masoud, Kamali Fahime, Mirhosseininia Jeyran, Shahbazi Mohammadhashem, Vaferi Behzad
Department of Chemical Engineering, Shiraz Branch, Islamic Azad University, Shiraz, Iran.
Heliyon. 2024 Nov 29;10(23):e40780. doi: 10.1016/j.heliyon.2024.e40780. eCollection 2024 Dec 15.
Pipe-stuck, filtrate volume, and formation damage during the drilling operation are directly related to the poor performance of drilling fluids. Hence, considerable attention is required to improve the filtration and rheological properties of drilling fluids and achieve industrial and environmental qualification standards. This study experimentally investigates the impact of Pectin and Astragalus gum biopolymers on the filtration and rheological properties of the water-based drilling fluid (WBDF). It also compares the results with the base drilling fluid and those obtained by adding commercial xanthan gum to WBDF. Fourier Transform Infrared Spectroscopy, thermogravimetric analysis, Zeta potential, and Scanning Electron Microscopy are applied to characterize these additives. The viscosity, filtrate volume, gel strength, and yield point of these biopolymer-added WBDFs were experimentally measured and compared. Various rheological models have been examined to correlate the experimental data shear stress versus shear rate profiles. Also, the filtration characteristics of WBDF were analyzed at high-temperature and high-pressure conditions using the filter press. The results showed that biopolymer additives considerably improve WBDF performance. The fluid formulations with Pectin presented more advantages over the other two biopolymers regarding fluid cake formation and rheological properties. The WBDF containing xanthan gum, Pectin, and Astragalus gum decreases filtrate volume by 42.9 %, 55.7 %, and 48.6 %, and increases plastic viscosity by 34.4 %, 46.9 %, and 40.6 %, respectively. Also, 56.5 %, 73.9 %, and 78.3 % increases in the yield point of WBDFs were obtained by adding xanthan gum, Pectin, and Astragalus gum to WBDF, respectively. Generally, the viscosity and yield point were more stable for biopolymer additive drilling fluids at high temperatures. In addition, the results showed that adding Pectin would cause less formation damage. The experimental results show that the optimum concentration of xanthan gum, Pectin, and Astragalus gum is 1.4, 1, and 1.05 wt%, respectively.
钻井作业过程中的卡钻、滤液量和地层损害与钻井液的性能不佳直接相关。因此，需要格外关注改善钻井液的过滤和流变性能，并达到工业和环境质量标准。本研究通过实验研究了果胶和黄芪胶生物聚合物对水基钻井液（WBDF）过滤和流变性能的影响。还将结果与基础钻井液以及向WBDF中添加商业黄原胶所得到的结果进行了比较。采用傅里叶变换红外光谱、热重分析、zeta电位和扫描电子显微镜对这些添加剂进行表征。对这些添加了生物聚合物的WBDF的粘度、滤液量、凝胶强度和屈服点进行了实验测量和比较。研究了各种流变模型，以关联实验数据中的剪切应力与剪切速率曲线。此外，使用压滤机在高温高压条件下分析了WBDF的过滤特性。结果表明，生物聚合物添加剂显著改善了WBDF的性能。在滤饼形成和流变性能方面，含有果胶的流体配方比其他两种生物聚合物具有更多优势。含有黄原胶、果胶和黄芪胶的WBDF分别使滤液量减少了42.9%、55.7%和48.6%，塑性粘度分别增加了34.4%、46.9%和40.6%。此外，向WBDF中添加黄原胶、果胶和黄芪胶后，WBDF的屈服点分别提高了56.5%、73.9%和78.3%。一般来说，生物聚合物添加剂钻井液在高温下的粘度和屈服点更稳定。此外，结果表明添加果胶对地层的损害较小。实验结果表明，黄原胶、果胶和黄芪胶的最佳浓度分别为1.4、1和1.05 wt%。
