Gas lift system is optimized by use of PVT data combined with fluid and multiphase flow correlations. The first step in the study is the selection of appropriate correlations followed by multiphase flow calculations at various points of injection. From actual pressure and temperature surveys and determining the point of injection, a gas lift performance curve is constructed for the well. In order to determine the optimal gas lift condition, Solution nodal method is used to determine optimum injection depth, optimum well-head pressure, optimum production rate and minimum injection gas volume. A considerable gain could be obtained from implementing recommendations. Finding the appropriate valve space is done in this work is new compared to others.
Gas lift systems have a significant impact on the facility process. Figure (1.a) is a diagram of a gas lift system from the facility engineer's prespective. High pressure gas is injected into the well to lighten the column of fluid and allow the reservoir pressure to force the fluid to the surface. The gas that is injected is produced with the reservoir fluid into the low pressure system. Therefore , the low-pressure separator must have sufficient gas separation capacity to handle gas lift as well as formation gas. If gas lift is to be used, it is even more important from a production standpoint that the low pressure separator be operated at the lowest practical pressure.
The simulation is classified into two stages :
In the first stage, In order to calculate pressure drop, the appropriate correlations for fluid properties and multiphase flow are determined by Pressure-Volume-Temperature (PVT) data, presented in the theory section of this paper.
In the second stage to determine the expected production rates for injected gas rates at various point of injections, the appropriate fluid properties correlations and the appropriate vertical multiphase flow correlations were applied.
After determining points of injection for the well from actual pressure and temperature surveys, a gas lift performance curve was constructed for the well. In order to determine the most appropriate way to optimize the gas lift system, a comparison between the actual and optimum operating conditions is performed.
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