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Large scale, full time field gas lift design

Nanidou Konstantina

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Summary

Nodal analysis is the standard tool to use when designing a wellbore provided that steady state flow conditions prevail in the well. However, when operating conditions such as GOR, water cut, bottomhole flowing pressure or rate vary over time nodal analysis cannot be used directly. As a result, it cannot be directly applied to the bottom hole conditions which are obtained from a reservoir simulation program. To design a well under such transient reservoir conditions, pressure traverse curves need to be combined to the well flow data.In this thesis a dynamic reservoir model was set up and history matched by using the tNavigator reservoir simulation software. Firstly, the deviation survey of each well was needed to be designed in order to meet their location in the reservoir space. Subsequently, well flow data which is required to design the appropriate wellbore were exported and further utilized as input for the PIPESIM well flow simulator, and each well was checked for its ability to bear the prediction at the surface without the need for artificial lift.For each well in the reservoir model that needed a gas lift, such a system was designed to compensate the required production rates while respecting the available bottom hole pressure, as indicated by the reservoir simulation scenario. The gas lift system design consisted of selecting the appropriate well tubing size, the number and depth of injection valves, the gas injection pressure and the injected gas flowrate.Additionally, an evaluation of the well performance was run to test if the reservoir simulation schedule is running with no production problems.

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