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Basic design and simulation of gas production pipelines

Yusuf Suleiman-Ahmed

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Summary

This research involves the modeling of a gas field through the use of the petex simulation software. The reservoir is modeled to estimate the reserves followed by modeling the wells to generate the inflow performance curve and the vertical lift performance. Then a thorough design of the pipelines was conducted from the wellheads to the gas separator.The gas field in study consists of a single reservoir with four wells drilled for production. Two manifolds were used to connect producing fluid from the wells. The fluids were sent to a separator with an inlet pressure of 1000psig. The objective was to develop a pipeline network that will satisfy the constraint and at the same time maximize the gas production.Three sets of pipeline each with diameters 2 inches 10 inches and 20 inches were studied. The simulation was conducted with individual pipe diameter and the result was analyzed and compared against the result of the other pipes in study. Economic Analysis was performed to determine the present value of the three pipes under study.The simulations show that increasing the diameter increases the cumulative production up to a point, after which any further increase will not change the production significantly. In this study the pipelines with diameter of 20 inches seemed to have the highest present value (revenues minus the cost of the equipment) with respect to the other cases.

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