Petroleum Chemistry ( IF 1.3 ) Pub Date : 2021-12-02 , DOI: 10.1134/s0965544121110220 Wenxi Zhu 1 , Xiuhua Zheng 1
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Abstract
Colloidal Gas Aphron (CGA) drilling fluid is one of the most promising techniques in underbalanced drilling with excellent plugging and reservoir protection functions. Due to the limitation of poor thermal stability of commercial foaming agents used in oilfields, the research on high-temperature resistant CGA drilling fluid is still a challenge. In this study, a biodegradable glycine foaming agent AGS-12 was synthesized via a one-step method. The surface activity, foaming performance (25–150°C) of AGS-12 and the high temperature performance of AGS-12 based CGA drilling fluid (120–150°C) were studied. All the results provide a basis for the potential application of AGS-12 as an eco-friendly foaming agent in high-temperature CGA drilling fluids: 1) The product AGS-12 with 87% conversion rate was synthesized successfully by one-step method, which can be verified by FT-IR. TGA analysis suggested that AGS-12 had good thermal stability within 315°C. Moreover, AGS-12 is easily biodegradable and fully meets the first level discharge standard of petrochemical industry pollutants. 2) AGS-12 can reduce the surface tension of solvent water from 72.38 to 28.44 mN/m. Analysis of fundamental surface activity parameters illustrates the higher surface activity of AGS-12, compared with a variety of amino acid surfactants. 3) Waring-Blender test showed that foams generated by 3% AGS-12 always have higher half-life, foam quality and lower drainage speed than the foaming agents available on market within 150°C. 4) At 120/140/150°C, aphrons with diameter of 10–150 µm have been successfully generated in CGA drilling fluid by using AGS-12 as foaming agent. Rheological and filtration tests suggested that AGS-12 based CGA drilling fluid is a high-performance drilling fluid with strong shear thinning behavior, high viscosity, and low filtration invasion.
中文翻译：
烷基甘氨酸表面活性剂：一种用于胶体气体 Aphron (CGA) 钻井液的高效耐高温和可生物降解的发泡剂
摘要
胶体气体Aphron（CGA）钻井液是欠平衡钻井中最有前景的技术之一，具有良好的封堵和储层保护功能。由于油田使用的商品化发泡剂热稳定性差的限制，耐高温CGA钻井液的研究仍是一个挑战。在这项研究中，通过一步法合成了一种可生物降解的甘氨酸发泡剂 AGS-12。研究了AGS-12的表面活性、发泡性能（25-150℃）和AGS-12基CGA钻井液的高温性能（120-150℃）。所有结果为AGS-12作为环保型发泡剂在高温CGA钻井液中的潜在应用提供了基础：1）一步法成功合成了转化率为87%的产品AGS-12，这可以通过 FT-IR 进行验证。TGA分析表明AGS-12在315°C内具有良好的热稳定性。此外，AGS-12易生物降解，完全达到石化行业污染物一级排放标准。2）AGS-12可以将溶剂水的表面张力从72.38降低到28.44 mN/m。对基本表面活性参数的分析表明，与多种氨基酸表面活性剂相比，AGS-12 具有更高的表面活性。3) Waring-Blender 测试表明，在 150°C 范围内，由 3% AGS-12 产生的泡沫始终比市场上的发泡剂具有更高的半衰期、泡沫质量和更低的排水速度。4）在120/140/150°C下，以AGS-12为发泡剂，在CGA钻井液中成功生成了直径为10-150 μm的泡沫。
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