Modelling of nonaqueous and aqueous scale-inhibitor squeeze treatments

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

    17 Citations (Scopus)

    Abstract

    The most common method for preventing downhole scale formation is by applying a scale inhibitor squeeze treatment. In this process, a scale inhibitor solution is injected down a producer well into the near wellbore formation. Commonly, these scale inhibitor treatments are injected as aqueous solutions. However, there are certain situations where an aqueous based treatment is not desirable, such as where relative permeability effects, water blocking, fluid lifting, chemical penetration or hydrate formation are of major concern. This paper presents the results of a modelling sensitivity study comparing non-aqueous and aqueous scale inhibitor squeeze treatments. The model described can simulate the effect on the treatment life of treatment solubility in the oil and water phases, treatment strategy, adsorption properties (from the water and oleic phases), viscosity effects and wellbore friction. Of particular interest is the relationship between inhibitor solubility in the carrier and in situ phases, and the choice of phase for the overflush fluid. The relationship can have a very pronounced impact on inhibitor penetration and squeeze lifetimes. The sensitivity study is carried out using purpose written software for scale treatments. The code is a two-phase flow, multi-component, multi-layer, radial or linear mathematical model capable of simulating both aqueous and non-aqueous squeeze treatments. The model considers the immiscible displacement of oil and water phases along with inhibitor transport in both phases and mass transfer between phases. It is capable of modelling kinetic and equilibrium adsorption and desorption from either phase. The model has been validated by comparison with analytical solutions, standard conventional single-phase squeeze calculations and multi-phase reservoir simulation calculations5. An example two-phase calculation of a specific field treatment is included, and the results are compared with the field return profiles.
    Original languageEnglish
    Title of host publicationProceedings of the International Symposium on Oilfield Chemistry 2007
    Place of PublicationUnited States
    PublisherSociety of Petroleum Engineers
    ISBN (Print)9781555631901
    DOIs
    Publication statusPublished - 28 Feb 2007
    EventSPE International Symposium on Oilfield Chemistry 2007 - Houston, United States
    Duration: 28 Feb 20072 Mar 2007
    https://onepetro.org/SPEOCC/07OCS/conference/All-07OCS

    Publication series

    NameSPE International Symposium on Oilfield Chemistry 2007
    PublisherSociety of Petroleum Engineering
    ISSN (Print)1046-1779

    Conference

    ConferenceSPE International Symposium on Oilfield Chemistry 2007
    Abbreviated titleSPE 2007
    Country/TerritoryUnited States
    City Houston
    Period28/02/072/03/07
    Internet address

    Keywords

    • Wax remediation
    • water management
    • paraffin remediation
    • oilfield chemistry
    • wax inhibition
    • asphaltene remediation
    • scale inhibition
    • remediation of hydrates
    • absorption
    • Hydrate Remediation
    • Production Chemistry
    • Metallurgy and Biology
    • reservoir fluid dynamics
    • inhibition and remediation of hydrates
    • scale
    • paraffin / wax and asphaltene
    • flow in porous media

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