Effects of Ammonium Hydrolyzed Polyacrylonitrile on Oil-Well Cement Slurry
Publication: Journal of Materials in Civil Engineering
Volume 29, Issue 9
Abstract
Ammonium hydrolyzed polyacrylonitrile () is a drilling fluid additive usually used in drilling fluids. However, and cement slurry have poor chemical compatibility. When they come into contact with each other, cement slurry can be contaminated, which damages the cementing quality and causes downhole emergency. This paper studies the effects of on the properties of cement slurry, such as thickening time, rheological properties, and compressive strength. This paper combines atomic absorption spectrophotometer, zeta probe potentiostat, and environmental scanning electron microscope (ESEM) to explore the contamination mechanism in cement slurry. The experimental results show that decreases the zeta potential of cement slurry and reduces the electrical property of cement particle surfaces, which causes particles agglomeration. Moreover, reacts with cement slurry to generate a netlike cross-linked structure that changes the microstructure of cement slurry and agglomerates cement particles to increase the movement resistance of cement particles. Finally, the rheological properties and thickening time of cement slurry are deteriorated, and the netlike cross-linked structure is adsorbed on the cement particles surfaces, which reduces the rate of hydration reaction and decreases the compressive strength of cement stone. They seriously endanger the safety operation and cementing quality.
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Acknowledgments
The authors are grateful for the support by National Key Research and Development Plan, China (2016YFB0303602), and Key Laboratory–funded projects of Oil and Gas Field Materials of Sichuan Province, China (X151516KCL20).
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Published In
Journal of Materials in Civil Engineering
Volume 29 • Issue 9 • September 2017
Copyright
©2017 American Society of Civil Engineers.
History
Received: Feb 23, 2016
Accepted: Jan 10, 2017
Published online: Apr 13, 2017
Published in print: Sep 1, 2017
Discussion open until: Sep 13, 2017
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