Abstract
Horizontal well staged fracturing has been unlocking natural gas and oil in shale and reshaping the energy supply worldwide. With the updating technology of the integrated fracturing engineering, prolymer-coated proppants not only prevent fracture closure but also hold oilfield tracers which can be released under certain conditions, offering a viable strategy to report the information of proppants, fractures and fluids in reservoir based on tracer flowback data. But release kinetics of tracers from functional proppants, which is a fundamental and critical issue in the application of the tracer-released proppant, is yet to be discussed. Here, coupled with rare earth tracer, poly(ethyl acrylate-co-methyl methacrylate-co-trimethylammoniethyl methacrylate chloride) is taken as an example to build a model tracer-releasedproppant. Release curves of tracers, under reservoir conditions (salinity and temperature conditions), were studied to reveal the release mechanism, and the potential applicability of the rare earth tracer-released proppants for reporting the proppants position and fluid contribution in multi-staged fracturing monitoring was confirmed in laboratory flow experiment.
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