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Improved oscillation method for measuring net gas in-place with capillary condensation
Airlangga, Muhammad Wendy
Airlangga, Muhammad Wendy
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2021
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Evaluation and development of shale or tight reservoirs would yield a higher success ratio if we have a deep understanding of fluid-rock interactions. Confinement within nanopores makes adsorption and capillary condensation of gas possible. Studies have shown that the latter can significantly affect the total gas in-place, well performance, and production forecast of a gas field. The total gas in-place with adsorption/capillary condensation can be measured at reservoir conditions using volumetric and gravimetric methods. Most existing setups are however relatively complex and expensive. This study presents successful measurements of net gas in-place in a synthesized material, MCM-41, using a simple oscillation-based device. This device measures the mass of a sample from its oscillation frequency when suspended under a spring. In this study, improvements to the setup, to data collection, and to processing have been developed. Specifically, a new and more universal equation for the added-mass experienced in the oscillations was established and proven to work well with all tested gases. Small mass changes on the order of 0.073-0.154 g over a net mass (mc) of 22.058 g can be reliably measured from the frequency. We report measured mass of argon, methane, propane, and CO2 inside our MCM-41 sample at various pressures. Data for propane clearly show the occurrence of capillary condensation. Data for CO2 do not show a clear sign of capillary condensation because under the condition of the experiment CO2 is near-critical. The net gas in-place for argon, methane, and CO2 however all suggested strong adsorption. Modifications to the device in the spring system, temperature control and signal amplification should be useful for future experiments.
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