Hamad Bahati Adnan, He Miao, Xu Mingbiao, Liu Weihong, Mpelwa Musa, Tang Shanfa, Jin Lijun, Song Jianjian
School of Petroleum Engineering, Yangtze University, Wuhan 430100, China.
Hubei Cooperative Innovation Center of Unconventional Oil and Gas in Yangtze University, Wuhan 430100, China.
ACS Omega. 2020 Apr 7;5(15):8483-8495. doi: 10.1021/acsomega.9b03774. eCollection 2020 Apr 21.
Exploring deep and ultradeep wells has rapidly become more significant to meet the global demand for oil and gas. The study of rheological and filtration-loss properties is essential to designing drilling muds and determining their performance under operational conditions. Rheological and filtration-loss properties of drilling muds were found to have a negative impact when exposed to elevated temperatures in the wells. In this study, an amphoteric polymer (abbreviated to PEX) was synthesized and characterized using a combination of analyses: FTIR, SEM, CNMR, and TGA. The synthesized PEX was used as an additive in water-based drilling muds to improve rheological properties and reduce fluid loss at elevated temperatures (180-220 °C). The experimental results demonstrated that inclusion of an optimal concentration of PEX (0.3 wt %) into the drilling mud formulation increased the rheological properties by 62.3% and decreased the filtration loss by 63.5% at an aging temperature of 180 °C. Moreover, PEX was found to perform superbly compared to polyanionic cellulose (PAC-LV) and polyacrylamide (PAM), the widely used drilling mud additives. PEX not only improved the rheological properties and reduced the filtration loss behavior but also bolstered the thermostability of the drilling mud formulation. It was concluded that the rigidity and amphoteric nature of PEX accounted for the exceptional performance and temperature resistance for PEX-drilling mud formulations. Succinctly, PEX exhibits admirable properties in smart drilling mud formulations for drilling operations under high-temperature geothermal conditions. Moreover, in terms of rheological models, the Herschel-Bulkley model adequately described the rheological properties of all the studied drilling mud formulations.
为满足全球对石油和天然气的需求，勘探深井和超深井变得越来越重要。研究流变学和滤失性能对于设计钻井液并确定其在作业条件下的性能至关重要。研究发现，钻井液的流变学和滤失性能在井中温度升高时会产生负面影响。在本研究中，合成了一种两性聚合物（简称为PEX），并通过FTIR、SEM、CNMR和TGA等多种分析方法对其进行了表征。合成的PEX用作水基钻井液的添加剂，以改善流变性能并降低高温（180-220°C）下的滤失量。实验结果表明，在钻井液配方中加入最佳浓度的PEX（0.3 wt%），在180°C的老化温度下，流变性能提高了62.3%，滤失量降低了63.5%。此外，与广泛使用的钻井液添加剂聚阴离子纤维素（PAC-LV）和聚丙烯酰胺（PAM）相比，PEX表现出色。PEX不仅改善了流变性能，降低了滤失行为，还增强了钻井液配方的热稳定性。得出的结论是，PEX的刚性和两性性质是其在PEX钻井液配方中表现优异和具有耐高温性的原因。简而言之，在高温地热条件下的钻井作业中，PEX在智能钻井液配方中表现出令人钦佩的性能。此外，就流变模型而言，Herschel-Bulkley模型充分描述了所有研究的钻井液配方的流变性能。
