ISSN   1004-0595

CN  62-1095/O4

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崔露, 杨广彬, 张平余, 余来贵, 张晟卯. 表面修饰油溶性BaSO4@SiO2-OTMS纳米微粒的制备及作为油基钻井液添加剂的研究[J]. 摩擦学学报, 2018, 38(4): 478-485. DOI: 10.16078/j.tribology.2018.04.013
引用本文: 崔露, 杨广彬, 张平余, 余来贵, 张晟卯. 表面修饰油溶性BaSO4@SiO2-OTMS纳米微粒的制备及作为油基钻井液添加剂的研究[J]. 摩擦学学报, 2018, 38(4): 478-485. DOI: 10.16078/j.tribology.2018.04.013
CUI Lu, YANG Guangbin, ZHANG Pingyu, YU Laigui, ZHANG Shengmao. Preparation of Surface Modified Oil Soluble BaSO4@SiO2-OTMS Nanoparticles Used as Additive in Oil-Based Drilling Fluid[J]. TRIBOLOGY, 2018, 38(4): 478-485. DOI: 10.16078/j.tribology.2018.04.013
Citation: CUI Lu, YANG Guangbin, ZHANG Pingyu, YU Laigui, ZHANG Shengmao. Preparation of Surface Modified Oil Soluble BaSO4@SiO2-OTMS Nanoparticles Used as Additive in Oil-Based Drilling Fluid[J]. TRIBOLOGY, 2018, 38(4): 478-485. DOI: 10.16078/j.tribology.2018.04.013

表面修饰油溶性BaSO4@SiO2-OTMS纳米微粒的制备及作为油基钻井液添加剂的研究

Preparation of Surface Modified Oil Soluble BaSO4@SiO2-OTMS Nanoparticles Used as Additive in Oil-Based Drilling Fluid

  • 摘要: 采用原位表面修饰和溶胶-凝胶法制备了十八烷基三甲氧基硅烷(OTMS)修饰的油溶性BaSO4@SiO2-OTMS纳米微粒;利用透射电子显微镜、X射线衍射仪、傅里叶变换红外光谱仪分析了产物的形貌及结构,采用热分析仪评价了其热稳定性,用往复摩擦磨损试验机和六速旋转黏度计研究了产物对油基钻井液润滑性能及流变性能的影响. 结果表明:所制备的BaSO4@SiO2纳米微粒由直径为30 nm的BaSO4内核和厚约8 nm的SiO2外壳组成,经OTMS修饰后,BaSO4@SiO2-OTMS纳米微粒在液体石蜡中具有良好的分散稳定性. 与此同时,BaSO4@SiO2-OTMS纳米微粒作为添加剂可以降低油基钻井液的流动阻力,减轻钻头磨损,提高钻井速度. 当添加剂浓度较低时,随着添加剂含量的增加,油基钻井液的黏度降低;当添加剂质量分数为0.8%时,钻井液的黏度以及钢球-页岩摩擦副的摩擦系数和页岩磨痕宽度最小.

     

    Abstract: Oil soluble BaSO4@SiO2-OTMS nanoparticles were prepared by a sol-gel and in-situ surface modification method. The morphology and structure of the as-prepared BaSO4@SiO2-OTMS nanoparticles were analyzed by transmission electron microscopy, X-ray diffraction, and Fourier transform infrared spectrometry. The thermal stability of BaSO4@SiO2-OTMS nanoparticles was evaluated by thermogravimetric analysis, and its effects on the lubrication performance and rheological behavior of an oil-based drilling fluid were investigated with a reciprocating friction and wear tester and a six-speed rotational viscometer. Results show that the as-prepared BaSO4@SiO2 nanoparticles consisted of BaSO4 nano-cores with an average diameter of 30 nm and nano-silica shell with a thickness of about 8 nm. Thanks to the surface-modification of nano-silica by oleophilic octadecyltrimethoxysilane (denoted as OTMS), the as-prepared BaSO4@SiO2-OTMS nanoparticles can be well dispersed in liquid paraffin. In the meantime, BaSO4@SiO2-OTMS nanoparticles as the additive in the oil-based drilling fluid can reduce the flow resistance, abate the wear of the bit, and increase the drilling speed. When BaSO4@SiO2-OTMS nanoparticles were added in the oil-based drilling fluid at a relatively low concentration, the viscosity of the drilling fluid tended to decline with increasing additive content. At an additive concentration of 0.8% (mass fraction), the viscosity of the drilling fluid and the friction coefficient of the steel ball-shale disc sliding pair and the width of wear track of the shale disc reached the minimum.

     

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