Abstract
Abstract Due to operational constraints natural gas liquids (NGL) are sometimes blended with stabilized crude. This option is considered when there is a temporary surplus of NGL and for better NGL management. The NGL blend ratios are generally very small and conservative and are not meant to impact the crude quality. The blends have to meet rigorous vapor pressure specifications. A systematic study was conducted to determine the vapor pressures of different NGL/crude oil blends. The evaluation considered various factors that impact the vapor pressure of the blends, including the NGL/crude oil ratios, degree of crude stabilization, temperature, and the retention time in the pipeline and/or in the crude tanks. An important aspect of the study was to determine the "foaming tendency" and volume changes during blending. Vapor pressure curves were determined for different blends of stabilized crude with NGL as a function of temperature. The data included both the true vapor pressure and Reid vapor pressure of the blends. The experimental data were supplemented with equation of state simulations. Low vapor pressure data of blends are scarce, and the paper discusses the physical properties of NGL/crude oil blends.
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