This paper presents the results of a computer study which leads to the optimum design of a production system for flowing wells subjected to a natural water drive. The results presented consist of a series of graphs which are derived from an analysis of the inflow performance relationships, vertical lift performance, choke performance, horizontal flow performance, and the thermodynamic conditions of the surface conditioning equipment such as separator and flow lines.

The Hagedorn and Brown correlations and the Beggs and Brill correlations are utilized to determine pressure drop for vertical lift and horizontal flow performance for multiphase flow. Using these correlations and assuming a flow rate and starting from the separator, pressure losses are calculated along the flowline to the wellhead, across the choke, and down the tubing to the tubing intake. Output from the analysis results in an optimized system design which maximizes production for a set of reservoir conditions and surface contraints.

An example well problem are presented which demonstrate the applicability and versatility of the computer analysis. An analysis is also presented to assess the sensitivity of various parameters upon well performance. Such parameters as flowline size, separator temperature and pressure, choke size, tubing size, water oil ratio, gas oil ratio, productivity index, oil gravity and fluid slippage are considered in the sensitivity analysis.

The results of this analysis and the data presented provides the production engineer with a technique for designing a system which will optimize production from a given well. The approach is general in that the outputs from the analysis provides the engineer with a set of curves and graphs to assist in making a final decision concerning a specific well or group of wells.

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