Investigation for the novel use of a typical deep eutectic solvent as a potential shale inhibitor. Issue 1 (31st March 2022)

• Record Type: Journal Article
• Authors: Jia, Han; Huang, Pan; Han, Yugui; Wang, Qiuxia; Jia, Kaile; Sun, Tunan; Zhang, Fan; Yan, Hui; Lv, Kaihe
• Is Part Of: Energy sources. Volume 44:Issue 1(2022)
• Page Start: 1402
• Page End: 1415
• Publication Date: 2022-03-31
• Subjects: Deep eutectic solvent -- shale hydration and swelling -- clay -- inhibition -- drilling fluids; Natural resources -- Periodicals; Energy consumption -- Periodicals; Energy consumption -- Climatic factors -- Periodicals; Energy conversion -- Periodicals; Energy conversion -- Environment aspects -- Periodicals; Power (Mechanics) -- Periodicals; 333.7905
• DOI: 10.1080/15567036.2019.1643953
• Languages: English
• ISSNs: 1556-7036

Abstract

ABSTRACT: The hydration and swelling of shale cause borehole instability and seriously threaten the drilling safety, especially for the use of water-based drilling fluids. In this paper, the potential application of a typical deep eutectic solvent CU-DES comprised of choline chloride and urea (molar ratio 1:2) as a novel shale inhibitor was investigated for the first time. The inhibitive properties of CU-DES were evaluated by experiments such as bentonite inhibition test, linear swelling test, and shale cuttings hot-rolling dispersion test. Compared with traditional inhibitors KCl and polyether diamine (PDA), CU-DES with a lower concentration exhibited the much higher inhibitive capacity. Furthermore, CU-DES maintained excellent performance even at high temperature (160°C), which made it possible to utilize in high-temperature well drilling. To explain the inhibition mechanism of CU-DES, a series of analytical methods, including particle size distribution measurement, Zeta potential measurement, SEM, FTIR, and XRD were conducted. The results demonstrated that the great inhibitive properties of CU-DES were mainly dependent on both the electrostatic attraction and the hydrogen bond between CU-DES and clay.