The most common method for preventing scale formation is by applying a scale inhibitor (SI) squeeze treatment. In this process, a scale inhibitor solution is injected down a producer well into the near wellbore formation. In the last few years, several publications have presented experimental results, field data and treatment methods showing enhanced squeeze lifetime, due to use of squeeze enhancers. The main purpose of this paper is to model the effect of SI retention enhancing additives. These additives are normally deployed in reservoirs, where the SI shows poor retention in the formation matrix, in order to reduce the well intervention. In the last few years, a number of techniques to enhance the SI retention have been reported in the literature, such as precipitation squeezes using calcium and/or pH increasing additives, use of additive package that enhances SI adsorption by cross-linking and the injection of non-damaging concentrations of kaolinite, calcium carbonate and organosilane (a solids fixation agent). Specifically the effect of the SI retention enhancer is modelled as a function of the adsorption level of the additive. A sensitivity study is then presented of the effect of deploying the additive in the different stages; normally they are deployed in the preflush stage. However, the aim of this paper is to investigate how the treatment could be optimized to achieve the longest squeeze lifetime with a fixed amount of additive. Example of modelling a specific field treatment injecting organosilane is included. The results are compared with the field return profiles and clearly demonstrate the value such modelling can bring to the interpretation and design of field squeezes.
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