Please use this identifier to cite or link to this item: http://hdl.handle.net/2440/120344
Type: Thesis
Title: Approaches to Fines Production in the Walloons Subgroup, Surat Basin, Queensland
Author: Jenkinson, Leslie George
Issue Date: 2018
School/Discipline: Australian School of Petroleum
Abstract: This study characterises the root causes for fines generation in coal seam gas wells in the Walloons Subgroup of the Surat Basin, southeast Queensland, Eastern Australia. Fines production can be critical in causing erosion in downhole pumping equipment and disruption to surface facilities. The Surat Basin has, in places, exceptional coal permeabilities (>1 Darcy), and most high permeability wells are completed with pre-perforated liners. Fines that are captured in separators are usually generated from the interburden lithologies, not from coals (reservoir rocks). Fines production characterisation and mitigation generically requires identification of the processes that lead to breakdown of cohesion in rocks that generate fines. Conventionally, fines production is dealt with using a geomechanical approach to understand the interaction of rock strength and in situ stresses in the context of reservoir production conditions. Significant factors that may control fines production are in-situ stresses, rock strength, drawdown and depletion as well as completion type and geometry. Geomechanical models were developed from log based, strain derived stress models, which are calibrated to rock strength testing of the core samples. Interestingly, fines production remains prevalent in areas with low differential stress and little variability in other parameters, such as flowing bottom hole pressure (FBHP). Tests exposing interburden rocks to produced formation water were used to understand rock weakening, as well as a comprehensive program of mineralogy (XRD) and rock fluid sensitivity testing on selected sandstone, siltstone and mudstone core samples. Each sample was photographed initially dry (i.e., in its original state), and then in contact with synthetic brine or various clay stabiliser solutions, in order to qualitatively evaluate the change in both rock strength and stability over the duration of fluid exposure. Results suggest that volcanogenic sediments contribute to fines production in fields in the Walloons Subgroup. The results of the work presented here help to identify completion strategies, go forward development and future production optimisation opportunities.
Advisor: Tingay, Mark
Flottmann, Thomas
Dissertation Note: Thesis (MPhil) -- University of Adelaide, Australian School of Petroleum, 2018
Keywords: Fines production
walloons sub group
geomechanics
petrophysics
Provenance: This electronic version is made publicly available by the University of Adelaide in accordance with its open access policy for student theses. Copyright in this thesis remains with the author. This thesis may incorporate third party material which has been used by the author pursuant to Fair Dealing exceptions. If you are the owner of any included third party copyright material you wish to be removed from this electronic version, please complete the take down form located at: http://www.adelaide.edu.au/legals
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