The phase behavior of oil + water + nonionic surfactant systems has been thoroughly studied. The oil had been commonly represented by a single long-chain hydrocarbon. In this work, the influence of methane on the phase behavior of the system decane + water + 2-butoxyethanol is presented. Mixtures of methane decane describe the oil. The methane concentrations in the oil mixture were 0, 5, and 10 wt % (respectively 0, 30, and 50 mol %). The investigated temperature range was from 278 to 365 K, and the studied pressure range was from 10 to 100 MPa. In the temperature, pressure, and methane concentration range investigated in this work, the phase transition with increasing pressure at a constant temperature was always found to be 2→ 3 → 2. For the systems containing 10 wt % methane in the oil mixture the formation of gas hydrates, could be observed for low surfactant concentrations and low temperatures.
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