Sulphide scale (PbS/ZnS) formation and inhibition tests for a gas condensate field with severe scaling conditions

Cyril Okocha, Kenneth Stuart Sorbie, Christian Hurtevent, Salima Baraka-Lokmane, Marcus Rossiter

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

    12 Citations (Scopus)


    Identifying effective sulphide scale squeeze inhibitors has been a major challenge in the production of oil and gas from deeper, higher temperature reservoirs. Managing sulphide scales of zinc and lead (ZnS and PbS) that commonly occurs in deep, hot reservoirs poses a significant challenge because of their very low solubilities. In general, for scaling problems applying chemical scale inhibitors or dispersants is the preferred solution to most challenges. However, to date no effective sulphide inhibitors/dispersants have been available which can deal with severe lead, zinc and iron sulphide problems at high salinity (HS >200, 000TDS) and high temperature (HT >180°C) conditions. It is a particularly difficult task to find sulphide inhibitors which can also be "squeezed" successfully since they must return to the wellbore at relatively high concentrations. This paper describes various sulphide inhibitor testing techniques which have been applied to many candidate products for the management of ZnS and PbS in a gas condensate field with a known relatively severe ZnS/PbS scaling problem. The paper presents sulphide static and dynamic test measurements along with thermal ageing results that show some encouraging results in terms of ZnS/PbS sulphide inhibition. The paper extends our knowledge and ability to test effective sulphide inhibitors for severe ZnS/PbS scaling conditions in high pressure/high temperature (HPHT) reservoirs.
    Original languageEnglish
    Title of host publicationSPE International Conference and
    Subtitle of host publicationExhibition on Oilfield Scale 2014
    Place of PublicationRichardson, Texas
    PublisherSociety of Petroleum Engineers
    Number of pages18
    ISBN (Electronic)9781613993255
    ISBN (Print)9781632665911
    Publication statusPublished - 2014
    EventSPE International Oilfield Scale Conference and Exhibition - Aberdeen, United Kingdom
    Duration: 14 May 201415 May 2014


    ConferenceSPE International Oilfield Scale Conference and Exhibition
    Country/TerritoryUnited Kingdom


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