Synergistic properties of phosphonate and polymeric scale inhibitor blends for barium sulphate scale inhibition

    Research output: Chapter in Book/Report/Conference proceedingConference contribution

    Abstract

    Barium sulphate is one of the most difficult types of scale to inhibit in oil and gas production systems, due to its physical hardness and its chemical and thermal stability. Barium sulphate is most commonly inhibited using either phosphonate or polymeric scale inhibitors (Sis) deployed at sub-stoichiometric concentrations. What is less well known in the oil industry is the effect of using combinations of two (or more) Sis synergistically for enhanced scale inhibition performance. A positive "synergistic" effect would be where, for example, 5ppm of A + 5ppm of B performed better than 10ppm of either A or B. In this paper, a series of static barium sulphate inhibition efficiency (IE) test results are presented, in which a series of pairs of SIs have been tested to determine their synergistic properties at pH 5.5 and 95°C. Polymers can be blended with phosphonates, or alternatively pairs of phosphonates or polymers may be applied. In all cases, the synergistic IE is compared with the IE of each SI tested independently at the mass dosage (i.e. the same concentration in mg/L or ppm). Each separate single SI used in the work has been tested previously for barium sulphate IE at pH 5.5, 95°C in order to determine the minimum inhibitor concentration (MIC) for each species (Shaw et al, 2012a, 2012b). Previously, 9 phosphonate and 9 polymeric Sis have been tested individually, in this work, 34 SI combinations have been tested to examine their synergistic properties. The MICs of the synergistic blends are compared with the normal MICs of the individual SIs. Surprisingly, in most cases, the IE of the blends is usually higher over the range of SI concentrations tested (i.e. the MIC of the blend is lower), compared to that of each SI tested separately. Certain "pairs" of SIs used together yield a significantly beneficial effect, e.g. DETPMP and HMTPMP. Some mechanistic reasons why these synergistic pairs work particularly well are suggested.
    Original languageEnglish
    Title of host publicationSPE International Conference and Exhibition on Oilfield Scale 2014
    Place of PublicationRichardson, Texas
    PublisherSociety of Petroleum Engineers
    Pages64-78
    Number of pages15
    ISBN (Electronic)9781613993255
    ISBN (Print)9781632665911
    DOIs
    Publication statusPublished - 2014
    EventSPE International Oilfield Scale Conference and Exhibition - Aberdeen, United Kingdom
    Duration: 14 May 201415 May 2014

    Conference

    ConferenceSPE International Oilfield Scale Conference and Exhibition
    CountryUnited Kingdom
    CityAberdeen
    Period14/05/1415/05/14

    Fingerprint

    barium sulfate
    phosphonates
    polymers
    oils
    thermal stability
    hardness
    production technology
    industry
    dosage
    testing

    Cite this

    Shaw, S., & Sorbie, K. S. (2014). Synergistic properties of phosphonate and polymeric scale inhibitor blends for barium sulphate scale inhibition. In SPE International Conference and Exhibition on Oilfield Scale 2014 (pp. 64-78). Richardson, Texas: Society of Petroleum Engineers . https://doi.org/10.2118/169752-MS
    Shaw, Scott ; Sorbie, Kenneth Stuart. / Synergistic properties of phosphonate and polymeric scale inhibitor blends for barium sulphate scale inhibition. SPE International Conference and Exhibition on Oilfield Scale 2014. Richardson, Texas : Society of Petroleum Engineers , 2014. pp. 64-78
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    Shaw, S & Sorbie, KS 2014, Synergistic properties of phosphonate and polymeric scale inhibitor blends for barium sulphate scale inhibition. in SPE International Conference and Exhibition on Oilfield Scale 2014. Society of Petroleum Engineers , Richardson, Texas, pp. 64-78, SPE International Oilfield Scale Conference and Exhibition, Aberdeen, United Kingdom, 14/05/14. https://doi.org/10.2118/169752-MS

    Synergistic properties of phosphonate and polymeric scale inhibitor blends for barium sulphate scale inhibition. / Shaw, Scott; Sorbie, Kenneth Stuart.

    SPE International Conference and Exhibition on Oilfield Scale 2014. Richardson, Texas : Society of Petroleum Engineers , 2014. p. 64-78.

    Research output: Chapter in Book/Report/Conference proceedingConference contribution

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    AB - Barium sulphate is one of the most difficult types of scale to inhibit in oil and gas production systems, due to its physical hardness and its chemical and thermal stability. Barium sulphate is most commonly inhibited using either phosphonate or polymeric scale inhibitors (Sis) deployed at sub-stoichiometric concentrations. What is less well known in the oil industry is the effect of using combinations of two (or more) Sis synergistically for enhanced scale inhibition performance. A positive "synergistic" effect would be where, for example, 5ppm of A + 5ppm of B performed better than 10ppm of either A or B. In this paper, a series of static barium sulphate inhibition efficiency (IE) test results are presented, in which a series of pairs of SIs have been tested to determine their synergistic properties at pH 5.5 and 95°C. Polymers can be blended with phosphonates, or alternatively pairs of phosphonates or polymers may be applied. In all cases, the synergistic IE is compared with the IE of each SI tested independently at the mass dosage (i.e. the same concentration in mg/L or ppm). Each separate single SI used in the work has been tested previously for barium sulphate IE at pH 5.5, 95°C in order to determine the minimum inhibitor concentration (MIC) for each species (Shaw et al, 2012a, 2012b). Previously, 9 phosphonate and 9 polymeric Sis have been tested individually, in this work, 34 SI combinations have been tested to examine their synergistic properties. The MICs of the synergistic blends are compared with the normal MICs of the individual SIs. Surprisingly, in most cases, the IE of the blends is usually higher over the range of SI concentrations tested (i.e. the MIC of the blend is lower), compared to that of each SI tested separately. Certain "pairs" of SIs used together yield a significantly beneficial effect, e.g. DETPMP and HMTPMP. Some mechanistic reasons why these synergistic pairs work particularly well are suggested.

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    M3 - Conference contribution

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    Shaw S, Sorbie KS. Synergistic properties of phosphonate and polymeric scale inhibitor blends for barium sulphate scale inhibition. In SPE International Conference and Exhibition on Oilfield Scale 2014. Richardson, Texas: Society of Petroleum Engineers . 2014. p. 64-78 https://doi.org/10.2118/169752-MS