Acid-Modified Biochar/poly(arginyl-Lysine) Composite as an Environmentally Friendly High-Temperature Shale Inhibitor
- 1Chinese Academy of Geological Sciences , ,
Abstract
High-temperature shale oil and gas drilling calls for effective and environmentally friendly additives capable of control clay hydration, shale dispersion, and wellbore instability in water-based drilling fluids. In this study, we prepared an acid-modified biochar (BC)/poly(arginyl-lysine) (JL) composite, designated JL-BC, via physical blending, and then evaluated its inhibition performance by means of linear swelling and hot-rolling recovery tests. Under treatment withJL-BC solution, the sodium bentonite (Na-BT) swelling height decreased to 4.49 mm at 150 °C for 16 h, while shale cuttings recovery reached 92.1% after aging at 220 °C for 16 h, results that outperforming those of potassium chloride (KCl), polyetheramine (PEA), 2,3-epoxypropyltrimethylammonium chloride (EPTAC), and dopamine (DA). Furthermore, the water-based drilling fluid supplemented with JL-BC maintained good rheological behavior, fluid loss control and inhibition performance after aging at 180 °C for 16 h. Mechanistic analyses revealed that JL-BC adsorbed strongly onto clay surfaces via electrostatic interactions and hydrogen bonding, thereby weakening the electrostatic repulsion between clay particles and reducing the amount of hydration-related water associated with Na-BT, which contributed to the inhibition of clay hydration and swelling. An environmental friendliness assessment showed that JL-BC was nontoxic and readily biodegradable, that it did not significantly increase soil heavy metal concentrations and promoted nutrient accumulation in wheat seedlings. Collectively, these findings indicate that JL-BC is a promising environmentally friendly shale inhibitor for high-temperature applications.
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BibTeX
@article{wang2026acidmodified,
title = {{Acid-Modified Biochar/poly(arginyl-Lysine) Composite as an Environmentally Friendly High-Temperature Shale Inhibitor}},
author = {Qiannan Wang and Yi Zhang and Wei Wang and Hengqian Ran and Zheng Guo and Shiyu Zhi},
journal = {ACS Omega},
year = {2026},
month = oct,
doi = {10.1021/acsomega.6c06752},
url = {https://pubs.acs.org/acsodf/article/doi/10.1021/acsomega.6c06752/5454863/Acid-Modified-Biochar-poly-arginyl-Lysine},
note = {CC BY-NC-ND 4.0},
}
RIS
TY - JOUR
TI - Acid-Modified Biochar/poly(arginyl-Lysine) Composite as an Environmentally Friendly High-Temperature Shale Inhibitor
AU - Qiannan Wang
AU - Yi Zhang
AU - Wei Wang
AU - Hengqian Ran
AU - Zheng Guo
AU - Shiyu Zhi
PY - 2026
DA - 2026/10/21
JO - ACS Omega
DO - 10.1021/acsomega.6c06752
UR - https://pubs.acs.org/acsodf/article/doi/10.1021/acsomega.6c06752/5454863/Acid-Modified-Biochar-poly-arginyl-Lysine
AB - High-temperature shale oil and gas drilling calls for effective and environmentally friendly additives capable of control clay hydration, shale dispersion, and wellbore instability in water-based drilling fluids. In this study, we prepared an acid-modified biochar (BC)/poly(arginyl-lysine) (JL) composite, designated JL-BC, via physical blending, and then evaluated its inhibition performance by means of linear swelling and hot-rolling recovery tests. Under treatment withJL-BC solution, the sodium bentonite (Na-BT) swelling height decreased to 4.49 mm at 150 °C for 16 h, while shale cuttings recovery reached 92.1% after aging at 220 °C for 16 h, results that outperforming those of potassium chloride (KCl), polyetheramine (PEA), 2,3-epoxypropyltrimethylammonium chloride (EPTAC), and dopamine (DA). Furthermore, the water-based drilling fluid supplemented with JL-BC maintained good rheological behavior, fluid loss control and inhibition performance after aging at 180 °C for 16 h. Mechanistic analyses revealed that JL-BC adsorbed strongly onto clay surfaces via electrostatic interactions and hydrogen bonding, thereby weakening the electrostatic repulsion between clay particles and reducing the amount of hydration-related water associated with Na-BT, which contributed to the inhibition of clay hydration and swelling. An environmental friendliness assessment showed that JL-BC was nontoxic and readily biodegradable, that it did not significantly increase soil heavy metal concentrations and promoted nutrient accumulation in wheat seedlings. Collectively, these findings indicate that JL-BC is a promising environmentally friendly shale inhibitor for high-temperature applications.
SN - 2470-1343
ER -