Chemical reactivity of some reservoir illites; implications for petroleum production

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Authors:Hughes, C. R.; Davey, R. C.; Curtis, C. D.
Author Affiliations:Primary:
Univ. Sheffield, Dep. Geol., Sheffield, United Kingdom
Univ. Manchester, United Kingdom
Volume Title:Clay Minerals
Source:Clay Minerals, 24(2), p.445-458. Publisher: Mineralogical Society, London, United Kingdom. ISSN: 0009-8558
Publication Date:1989
Note:In English. 6 refs.; illus. incl. 5 tables
Summary:Authigenic illite samples have been isolated from preserved reservoir core and characterized by XRD, XRF, SEM and ATEM. Reactivity towards a variety of aqueous solutions has been evaluated. In flask experiments with dilute reagents reaction appears to be simple stoichiometric dissolution. The same pattern extends to higher concentrations, except for alkalis where Si is preferentially leached leaving an Al-rich residual phase. In the more vigorous conditions of flow stronger acid and alkaline solutions cause substantial dissolution although by a different mechanism. In many of the experiments gels were seen to precipitate downstream from the reaction site. Similar reactions can be expected to take place as a result of a range of drilling, stimulation and production procedures. Clay dissolution, modification and, possibly, migration would be anticipated close to the well-bore and damage from scaling (gels) somewhat further away. [R.E.S.]
Subjects:Authigenic minerals; Clay mineralogy; Engineering geology; Experimental studies; Illite; Mineral data; Petroleum; Petroleum engineering; Production; Reservoir rocks; Sheet silicates; Silicates; TEM data; Theoretical studies; Reactions
Abstract Numbers:90M/2660
Record ID:1989080962
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom
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