A Simplified Method To Predict Over-All Production Performance

Abstract

this article begins on the next page F F JCPT90-01-09 RESERVOIR PERFORMANCE AND OPTIMIZATION A simplified method to predict over-all production performance GODOFREDO PEREZ and BALMOHAN G. KELKAR The University of Tulsa ABSTRACT Th@ paper presents a simple method to predict the over-all produc-tion performance of oil and gas systems. Conventional methods usually require time consuming graphical approaches. The pro-posed method is based on a simple mathematical algorithm that Provides fast and accurate means to estimate the over-all perform-ance of a production system. In addition, the proposed method has been designed to search for unstable production conditions that might exist in the system. The method has been used to develop a computer model representing a system consisting of several production components. The production components considered in the computer model are.-reservoir, perforations, gravel pack, tubing, subsurface safety valve, wellhead choke, surface pipeline and separator. In addi-tion, a gas lift system is also included.Practical applications of the model are presented, and these in-clude.-sensitivity analysis of the performance of an oil produc-tion system and evaluation of unstable conditions in a gas condensate system. Results from this model are compared and agree closely with several cases presented in the literature. Introduction Over-all production performance is the flow rate that a system is able to sustain under the restrictions imposed by the produc-tion components. Physical restrictions of production systems can be divided into several components such that the pressure losses across each component are evaluated independently. Correct de-termination of the performance of a production system depends ultimately on the accuracy of the pressure loss predictions across each component of the system. Research effons in the last few years have resulted in several methods and correlations capable of accurately predicting pressure losses across different produc-tion components for a wide range of operating conditions. These include, correlations to estimate pressure losses in pipelines, ver-tical tubings, and other restrictions (chokes, safety valves) for mul-tiphase flow conditions. Also, methods and correlations are available to estimate reservoir deliverabifity from stabilized well test data with good accuracy. On the other hand, additional in-vestigation is required to improve methods for the prediction ol pressure losses across wefl completions (gravel pack and perfora-tions). Several of these methods and correlations used in this work are discussed in a later section. Calculation of over-all production performance of a system in-Keywords: Over-afl production performance, Production system, Produc-tion system components, Nodal analysis, Multiphase flow pressure loss correlations, Sensitivity analysis, Unstable flow condifions. volves a simple principle. This consists of dividing the production system into two parts at a fixed point (node), and for a given flow rate, starting for one part a...

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