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    Mineralogy and pore topology analysis during matrix acidizing of tight sandstone and dolomite formations using chelating agents

    Access Status
    Fulltext not available
    Authors
    Shafiq, M.
    Ben Mahmud, Hisham
    Arif, M.
    Date
    2018
    Type
    Journal Article
    
    Metadata
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    Citation
    Shafiq, M. and Ben Mahmud, H. and Arif, M. 2018. Mineralogy and pore topology analysis during matrix acidizing of tight sandstone and dolomite formations using chelating agents. Journal of Petroleum Science and Engineering. 167: pp. 869-876.
    Source Title
    Journal of Petroleum Science and Engineering
    DOI
    10.1016/j.petrol.2018.02.057
    ISSN
    0920-4105
    School
    Curtin Malaysia
    URI
    http://hdl.handle.net/20.500.11937/72040
    Collection
    • Curtin Research Publications
    Abstract

    © 2018 Hydrochloric acid (HCl) is commonly used during acidizing but certain problems are associated with its application such as corrosion of pipes, environment hazards, precipitation of fluosilicates or calcium fluorides and incompatibility of HCl with clay minerals. In order to mitigate these problems, few studies have proposed the use of chelating agents (the chemical compound that reacts with metal ions to form stable, water-soluble metal complexes) as an alternative. In this study, three different chelating agents, Ethylenediaminetetraacetic Acid (EDTA), N-(2-Hydroxyethyl) ethylenediamine-N,N',N'-triacetic Acid (HEDTA) and N-Acetyl-L-glutamic Acid (GLDA) were used to stimulate Colton tight sandstone and Guelph dolomite samples. The pH value of these chelates ranged from 1.7 to 3 and was measured before and after the core flooding to observe the physicochemical changes in rock/fluid mixtures. Core flood experiments under 180 °F temperature were conducted on core samples at slow injection rate which increased the contact time between the fluid and the rock and increased the amount of dissolved ions. Porosity, permeability, Inductively Coupled Plasma (ICP), and Tescan Integrated Mineral Analysis (TIMA) were employed to measure the changes in the formation properties. The effluent samples were analyzed for calcium, magnesium, aluminium, sodium, potassium, silicon and iron using the ICP to assess the ability of these chelates on the complexation of these ions. HEDTA showed a strong ability in chelating calcium, iron, magnesium, sodium and it chelated small amounts of aluminium ions from the sandstone cores. Porosity distribution analysis showed that the HEDTA was more effective in creating fresh pore spaces in sandstone formation while GLDA introduced a large amount of pore spaces in the dolomite. A large number of solid particles were dissolved using HEDTA in sandstone and GLDA in dolomite formations. Panorama of each sample shows that new wormholes had been created by all chelates. The research introduced the chelates application in sandstone and dolomite formations and they showed good results in terms of matrix acidizing. Moreover, the Tescan Integrated Mineral Analysis (TIMA) has not been applied before to test the change in pore structure and mineralogy during the acidizing.

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      © 2018 Southwest Petroleum University Mineral analysis plays a major role in the successful matrix acidizing as it shows the change in physiochemical changes in the formation due to the reaction with fluids injected. ...
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      Core flooding acidizing experiments on sandstone/carbonate formation are usually performed in the laboratory to observe different physical phenomena and to design acidizing stimulation jobs for the field. During the tests, ...
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      Properties of rock, such as effective porosity, permeability and pore size distribution (PSD), are generally referred to as petrophysical properties. These properties are among the most significant for reservoir evaluation. ...
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