eprintid: 6813
rev_number: 2
eprint_status: archive
userid: 1
dir: disk0/00/00/68/13
datestamp: 2023-11-09 16:18:36
lastmod: 2023-11-09 16:18:36
status_changed: 2023-11-09 16:07:44
type: article
metadata_visibility: show
creators_name: Huang, W.
creators_name: Leong, Y.-K.
creators_name: Chen, T.
creators_name: Au, P.-I.
creators_name: Liu, X.
creators_name: Qiu, Z.
title: Surface chemistry and rheological properties of API bentonite drilling fluid: pH effect, yield stress, zeta potential and ageing behaviour
ispublished: pub
keywords: Bentonite; Drilling fluids; Gels; Honeycomb structures; Leaching; Magnesium; Oil well drilling; pH effects; Recovery; Rheology; Sodium; Surface chemistry; Suspensions (fluids); Zeta potential, Bentonite suspensions; Clay interactions; Negative zeta potentials; Rheological behaviour; Rheological property; Sepiolite; Sodium montmorillonite; Thixotropy, Yield stress, bentonite; chemical property; drilling fluid; leaching; pH; rheology; sepiolite; viscosity
note: cited By 54
abstract: API bentonite, a key ingredient of drilling muds, displayed a negative zeta potential across the whole pH range of 2.5�12.3. It contained two very rheological active ingredients, sodium montmorillonite or Na+Mt (40.4) and needle-shape sepiolite (16). Due to the interplay of these two ingredients, the rheological behaviour displayed by the API bentonite suspensions is quite different to other bentonite suspensions. The gel displayed a very low or no yield stress at low acidic pH and a maximum yield stress at pH 8�12. Magnesium leaching from sepiolite at low pH and its hydrolysis plays a role in affecting the rheological properties at high pH. Yield stress and ageing behaviour was observed in suspensions with at least 3 wt solids. The Herschel-Bulkley (HB) model described the flow behaviour of these gels. Both the HB yield stress and viscosity at a fixed shear rate of the 7 wt gel peaked at pH 8.5 and were smallest at pH 5.2. The ageing or structural recovery behaviour is most pronounced at high pH for the most concentrated gels. Both the Leong and Nguyen-Boger ageing models described the structural recovery behaviour well. The recovery of the recently discovered very open honeycomb structure formed by Na+MT gel, after breakdown by shear was invoked to explain the ageing behaviour. © 2016 Elsevier B.V.
date: 2016
publisher: Elsevier B.V.
official_url: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84989832914&doi=10.1016%2fj.petrol.2016.07.016&partnerID=40&md5=cd3c06daa0a91a1b7b389ace4159dd32
id_number: 10.1016/j.petrol.2016.07.016
full_text_status: none
publication: Journal of Petroleum Science and Engineering
volume: 146
pagerange: 561-569
refereed: TRUE
issn: 09204105
citation:   Huang, W. and Leong, Y.-K. and Chen, T. and Au, P.-I. and Liu, X. and Qiu, Z.  (2016) Surface chemistry and rheological properties of API bentonite drilling fluid: pH effect, yield stress, zeta potential and ageing behaviour.  Journal of Petroleum Science and Engineering, 146.  pp. 561-569.  ISSN 09204105