Abstract: The present invention is directed to a method for allocating revenue or taxes to individual fluid streams commingled during an oil and gas production process, the method includes commingling fluid streams to produce a commingled fluid stream; (2) utilizing a process simulation model to predict a phase change of each fluid stream in the commingled fluid stream, wherein the process simulation model predicts the phase change of all the individual fluid streams in the commingled fluid stream the phase change of each individual fluid stream in isolation of the commingled fluid stream, the phase change of all the individual fluid streams in the commingled fluid stream absent a single fluid stream; and (3) determining the difference in phases between the calculated phase change of all the in individual fluid streams in the commingled fluid stream and calculated phase change of all the individual fluid streams in the commingled fluid stream absent a single fluid stream.

Abstract: A unidirectional pipe line flowmeter prover. Two calibrating spheres are used in connection with two support surfaces in the interchange conduit. Each support surface comprises a flexible liner mounted adjacent the interior of the interchange conduit so that upon being inflated it expands toward the center of the conduit. The liners are mounted so that when they are inflated they are vertically spaced, capable of trapping a sphere therebetween and sealing the interchange conduit. By timing the inflating and deflating of the liners two spheres are able to be alternately dropped into the prover and supported to assist in sealing the interchange conduit.