Development of fly ash reinforced nanocomposite preformed particle gel for the control of excessive water production in the mature oil fieldsAbhinav Kumar, Vikas Mahto and Virender Parkash SharmaOil Gas Sci. Technol. – Rev. IFP Energies nouvelles, 74 (2019) 8DOI: https://doi.org/10.2516/ogst/2018083