In this study, a silica templated synthesis route was adopted for fabrication of zinc-phosphonate nanoparticles to expand their use in the delivery of phosphonate inhibitors into formation core materials for scale control. Transition divalent metal Zn2+ was chosen due to its ability to significantly increase inhibitor retention and effectiveness. Zinc chloride was first adsorbed onto the surface of 22 nm silica particles, followed by gradual addition of diethylenetriaminepentakis (methylenephosphonic acid) (DTPMP) to form nanometer sized particles in the presence of sodium dodecylbenzene sulfonate (SDBS) surfactant. The physical and chemical properties of the synthesized Si-Zn-DTPMP nanoparticle slurry (nanofluid) have been carefully evaluated. The nanofluid was stable at 70°C in 1 % KCl at pH 6.7 for over 12 hours. The transport of the synthesized nanofluid through calcite and sandstone formation porous media has been investigated using column breakthrough experiments and modeled with a 1-D advection-dispersion equation. The nanofluid was transportable through these media and near total breakthrough could be obtained by pre-flushing the media with an anionic SDBS surfactant solution. The diafiltration experiment was designated to transform the nanoslurry into a less soluble phase, and such materials demonstrated a much longer inhibitor lifetime compared to the untreated ones. The long-term flow back performance of the fabricated nanofluid was examined via a laboratory squeeze simulation test where the nanoparticles gradually returned phosphonate inhibitors in the flow back brine solution, and the normalized return volume was comparable to conventional squeeze treatment.

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