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Preparation of Ammonium Oleic Acid Salts and Their Evaluation as Shale Swelling Inhibitors in Water-Based Drilling Fluid

Herstellung von Ammoniumölsäuresalzen und ihre Bewertung als Schieferquellungsinhibitoren in der wasserbasierten Bohrspülung
Rongjun Zhang, Yun Bai, Yan Sun, Weichao Du, Chunsheng Pu, Jie Zhang and Gang Chen

Abstract

In this paper, ammonium oleic acid salts (AOS) were prepared from oleic acid and amines and investigated as low molecular weight shale swelling inhibitors. First, the inhibitory effect of AOS was investigated using the linear expansion test of bentonite. The results show that the inhibitor prepared from oleic acid and tetraethylene pentamine with a molar ratio of 1:2 (AOS-8) has an excellent inhibitory effect on the hydration expansion of bentonite. The inhibitory effect of AOS-8 on bentonite was further investigated in subsequent work steps using various methods, including the linear swelling test of clay and particle distribution measurement. The results show that AOS-8 has superior performance in inhibiting hydration swelling and dispersion of bentonite. With 0.5% AOS-8, the swelling rate was reduced to 37.7%, and the particle size of bentonite in water could be controlled with AOS-8. Finally, the inhibition mechanism of AOS-8 was determined in detail by scanning electron microscopy (SEM) and thermogravimetric analysis (TGA). In water-based drilling fluid, AOS-8 is compatible with conventional additives. It can also significantly improve the lubricating capacity of the mud cake after ageing at 120°C.

Zusammenfassung

In dieser Arbeit wurden aus Ölsäure und Aminen Ammoniumölsäuresalze (AOS) hergestellt und diese als niedermolekulare Schieferquellungsinhibitoren untersucht. Zunächst wurde die inhibierende Wirkung von AOS mit dem linearen Ausdehnungstest von Bentonit untersucht. Die Ergebnisse zeigen, dass der aus Ölsäure und Tetraethylenpentamin mit einem Molverhältnis von 1:2 hergestellte Inhibitor (AOS-8) eine ausgezeichnete Hemmwirkung auf die Hydratationsausdehnung von Bentonit aufweist. Die Hemmwirkung von AOS-8 auf Bentonit wurde in den nachfolgenden Arbeitsschritten mit verschiedenen Methoden weiter untersucht, einschließlich des linearen Quell-tests von Ton und der Messung der Partikelverteilung. Die Ergebnisse zeigen, dass AOS-8 eine überlegene Leistung bei der Hemmung der Hydratationsquellung und Dispersion von Bentonit hat. Mit 0,5% AOS-8 wurde die Quellungsrate auf 37,7% reduziert, und die Partikelgröße von Bentonit in Wasser ließ sich mit AOS-8 kontrollieren. Schließlich wurde der Inhibitionsmechanismus des AOS-8 mittels Rasterelektronenmikroskopie (SEM) und thermogravimetrischer Analyse (TGA) im Detail bestimmt. In wasserbasierter Bohrspülung ist AOS-8 mit den herkömmlichen Additiven kompatibel. Außerdem kann es die Schmierfähigkeit des Schlammkuchens nach einer Alterung bei 120°C deutlich verbessern.


Prof. Dr. Gang Chen Shaanxi Province Key Laboratory of Environmental Pollution Control and Reservoir Protection Technology of Oilfields, Xi’an Shiyou University, Xi’an, 710065 China State Key Laboratory of Petroleum Pollution Control, CNPC Research Institute of Safety and Environmental Technology, Beijing, 102206 China
Dr. Yun Bai Shaanxi Province Key Laboratory of Environmental Pollution Control and Reservoir Protection Technology of Oilfields Xi’an Shiyou University Xi’an, 710065 China. School of Petroleum Engineering Petroleum University of China (Huadong) Qingdao, 266580 China

Acknowledgements

This work was financially supported by the grants from National Natural Science Foundation of China (21808182, 51974245) and Shaanxi Key Research and Development Program (2019ZDLGY06-03). We are also grateful for the support of the Youth Innovation Team of Shaanxi Universities and for the work of the Modern Analysis and Testing Center of Xi’an Shiyou University.

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Received: 2019-11-27
Accepted: 2020-08-18
Published Online: 2021-07-29
Published in Print: 2021-07-31

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