Flotation recovery of barite from high-density waste drilling fluid using β-cyclodextrin as a novel depressant and its mechanism.

Autor: Li X; Department of Petroleum Engineering, Yangzte University, Wuhan, China.; Hubei Key Laboratory of Drilling and Production Engineering of Oil and Gas, Wuhan, China., Xie S; State Key Laboratory of Petroleum Pollution Control, Beijing, China.; CNPC Research Institute of Safety and Environmental Technology Co. Ltd, Beijing, China., Xu Y; State Key Laboratory of Petroleum Pollution Control, Beijing, China.; CNPC Research Institute of Safety and Environmental Technology Co. Ltd, Beijing, China., Xia Y; Department of Petroleum Engineering, Yangzte University, Wuhan, China.; Hubei Key Laboratory of Drilling and Production Engineering of Oil and Gas, Wuhan, China., Cheng Y; Department of Petroleum Engineering, Yangzte University, Wuhan, China.; Hubei Key Laboratory of Drilling and Production Engineering of Oil and Gas, Wuhan, China., Tang S; Department of Petroleum Engineering, Yangzte University, Wuhan, China.; Hubei Key Laboratory of Drilling and Production Engineering of Oil and Gas, Wuhan, China., Wang D; Department of Petroleum Engineering, Yangzte University, Wuhan, China.; Hubei Key Laboratory of Drilling and Production Engineering of Oil and Gas, Wuhan, China., Ren W; State Key Laboratory of Petroleum Pollution Control, Beijing, China.; CNPC Research Institute of Safety and Environmental Technology Co. Ltd, Beijing, China., Zhang M; State Key Laboratory of Petroleum Pollution Control, Beijing, China.; CNPC Research Institute of Safety and Environmental Technology Co. Ltd, Beijing, China., Meng W; Department of Petroleum Engineering, Yangzte University, Wuhan, China.; Hubei Key Laboratory of Drilling and Production Engineering of Oil and Gas, Wuhan, China.
Jazyk: angličtina
Zdroj: PloS one [PLoS One] 2024 Mar 14; Vol. 19 (3), pp. e0298626. Date of Electronic Publication: 2024 Mar 14 (Print Publication: 2024).
DOI: 10.1371/journal.pone.0298626
Abstrakt: High-density waste drilling fluid contains an abundance of recyclable weighting reagents, direct disposal can pollute the environment. In this paper, the primary mineral composition of a high-density waste drilling fluid from a well in the southwest oil and gas field was analyzed. This paper proposes β-cyclodextrin (β-CD) as a depressant for the recovery of barite from waste drilling fluid. The recovery process was investigated through inverse flotation experiments, and the mechanism was analyzed using zeta potential, contact angle analysis, and FTIR. The flotation experiments showed that under the SDS flotation system, when the pH was 9.0 and the amount of depressant β-CD was 900 g/t, the barite recovery and density reached the highest values, which were 87.41% and 4.042 g/cm3, respectively. Zeta potential experiments, contact angle analysis, and FTIR analysis indicate that β-CD adsorbed onto barite through enhancing the hydrophilicity of barite, electrostatic force adsorption, and strong adsorption, which could not be displayed by SDS through competitive adsorption. Furthermore, β-CD exhibited a selective inhibitory effect on barite and enabled reverse flotation. The mechanism model of the flotation separation process was established.
Competing Interests: The authors received funding from PetroChina’s Strategic and Forward-Looking Major Science and Technology Project (2021DJ6601). This does not alter their adherence to PLOS ONE policies on sharing data and materials. There are no patents, products in development, or marketed products associated with this research to declare.
(Copyright: © 2024 Li et al. This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.)
Databáze: MEDLINE
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