Simulation of Multiple Pool Gas Reservoir System with a Common Gathering System
Authors: von Hantelmann Georg , Dempsey John R. 
Published: December 2007

This paper was prepared for the Second Annual European Meeting of the Society of Petroleum Engineers of AIME, to be held in London, England, April 2–3, 1973. Permission to copy is restricted to an abstract of not more than 300 words. Illustrations may not be copied. The abstract should contain conspicuous acknowledgment of where and by whom the paper is presented. Publication elsewhere after publication in the JOURNAL OF PETROLEUM TECHNOLOGY or the SOCIETY OF publication in the JOURNAL OF PETROLEUM TECHNOLOGY or the SOCIETY OF PETROLEUM ENGINEERS JOURNAL is usually granted upon request to the Editor PETROLEUM ENGINEERS JOURNAL is usually granted upon request to the Editor of the appropriate journal provided agreement to give proper credit is made.
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Abstract
This report summarizes the results of a numerical simulation study performed on seven dynamically independent gas reservoirs that are produced by one common surface-gathering system. produced by one common surface-gathering system. Many boundary conditions (sales contract conditions, technical possibilities, foreign producers through the same surface system) producers through the same surface system) influence the production.
The objective of the simulation study was to find the most economical production strategy for the total system. Many different case studies were made, the final four of which are described in this article. The results are production plans for all wells and time of production plans for all wells and time of equipment installation and/or changes.

Introduction
In recent years, reservoir simulation gained widespread use for long-range production planning. The technological breakthrough of planning. The technological breakthrough of solving the reservoir and surface gathering system simultaneously allows gas deliverability calculations to be performed both efficiently and accurately.
At the beginning of 1971 such a complex dry-gas simulation model including surface-system calculations was used for the following physical system: (1) seven independent gas physical system:seven independent gas reservoirs (Reservoir A to Reservoir G) (Fig. 1),18 wells together (Well 1 to Well 18),approximately 100 km of pipeline (Fig. 2),one terminal point andvariable gas-quality in different reservoirs.
Quality, pressure, rate and peak shaving conditions at pressure, rate and peak shaving conditions at the terminal point are determined by sales contracts. The objective of the study was to find the most economical production strategy, i.e., deliverability-development of each well, time of dehydration and/or compression-installation rate for each well.

THE SIMULATION MODEL
The model used is a one-phase two-dimensional gas simulation model based on the following equations.

Reservoir Equation
.. (1)

Tubing Equation
.............(2)
where.