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    Comparison of buffer effect of different acids during sandstone acidizing

    Access Status
    Open access via publisher
    Authors
    Shafiq, Mian Umer
    Mahmud, H.
    Hamid, M.
    Date
    2015
    Type
    Conference Paper
    
    Metadata
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    Citation
    Shafiq, M.U. and Mahmud, H. and Hamid, M. 2014. Comparison of buffer effect of different acids during sandstone acidizing, in Proceedings of the Materials Science and Engineering conference, Volume 78, (CUTSE2014), Dec 3-4 2014. Sarawak, Malaysia: IOP.
    Source Title
    IOP Conference Series: Materials Science and Engineering
    Source Conference
    IOP Conf. Series: Materials Science and Engineering
    DOI
    10.1088/1757-899X/78/1/012008
    ISSN
    1757-8981
    School
    Curtin Sarawak
    URI
    http://hdl.handle.net/20.500.11937/16317
    Collection
    • Curtin Research Publications
    Abstract

    The most important concern of sandstone matrix acidizing is to increase the formation permeability by removing the silica particles. To accomplish this, the mud acid (HF: HCl) has been utilized successfully for many years to stimulate the sandstone formations, but still it has many complexities. This paper presents the results of laboratory investigations of different acid combinations (HF: HCl, HF: H3PO4 and HF: HCOOH). Hydrofluoric acid and fluoboric acid are used to dissolve clays and feldspar. Phosphoric and formic acids are added as a buffer to maintain the pH of the solution; also it allows the maximum penetration of acid into the core sample. Different tests have been performed on the core samples before and after the acidizing to do the comparative study on the buffer effect of these acids. The analysis consists of permeability, porosity, color change and pH value tests. There is more increase in permeability and porosity while less change in pH when phosphoric and formic acids were used compared to mud acid. From these results it has been found that the buffer effect of phosphoric acid and formic acid is better than hydrochloric acid.

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