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Hydrophobic Small-Molecule Polymers as High-Temperature-Resistant Inhibitors in Water-Based Drilling Fluids

Xuyang Yao1,*, Kecheng Liu1, Zenan Zhou1, Jun Zhou1, Xianbin Huang2, Tiemei Lu1, Yongsheng Yu1, He Li2

1 Engineering Technology Research Institute of Xinjiang Oilfield Company, PetroChina, Karamay, 834000, China
2 School of Petroleum Engineering, China University of Petroleum (East China), Qingdao, 266580, China

* Corresponding Author: Xuyang Yao. Email: email

(This article belongs to this Special Issue: Fluid Flow and Materials Strength related to the Wellbore Safety)

Fluid Dynamics & Materials Processing 2023, 19(7), 1775-1787. https://doi.org/10.32604/fdmp.2023.025843

Abstract

Water-based drilling fluids can cause hydration of the wellbore rocks, thereby leading to instability. This study aimed to synthesize a hydrophobic small-molecule polymer (HLMP) as an inhibitor to suppress mud shale hydration. An infrared spectral method and a thermogravimetric technique were used to characterize the chemical composition of the HLMP and evaluate its heat stability. Experiments were conducted to measure the linear swelling, rolling recovery rate, and bentonite inhibition rate and evaluate accordingly the inhibition performance of the HLMP. Moreover, the HLMP was characterized through measurements of the zeta potential, particle size distribution, contact angles, and interlayer space testing. As confirmed by the results, the HLMP could successfully be synthesized with a favorable heat stability. Furthermore, favorable results were found for the inhibitory processes of the HLMP on swelling and dispersed hydration during mud shale hydration. The positively charged HLMP could be electrically neutralized with clay particles, thereby inhibiting diffusion in the double electron clay layers. The hydrophobic group in the HLMP molecular structure resulted in the formation of a hydrophobic membrane on the rock surface, enhancing the hydrophobicity of the rock. In addition, the small molecules of the HLMP could plug the spaces between the layers of bentonite crystals, thereby reducing the entry of water molecules and inhibiting shale hydration.

Graphical Abstract

Hydrophobic Small-Molecule Polymers as High-Temperature-Resistant Inhibitors in Water-Based Drilling Fluids

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Cite This Article

Yao, X., Liu, K., Zhou, Z., Zhou, J., Huang, X. et al. (2023). Hydrophobic Small-Molecule Polymers as High-Temperature-Resistant Inhibitors in Water-Based Drilling Fluids. FDMP-Fluid Dynamics & Materials Processing, 19(7), 1775–1787.



cc This work is licensed under a Creative Commons Attribution 4.0 International License , which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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