Accurate forecasting of gas production requires integrating reservoir volumes (reserves), sandface and wellhead deliverability, wellbore hydraulics, pipeline and compression capacity, and other factors such as sales contracts. The primary objective of this course is to convey a practically-driven, theoretically-sound methodology for generating accurate production forecasts. This is achieved by understanding the inter-relationships between reserves, deliverability and gas gathering systems. Major concepts are demonstrated by in-class examples.

• Estimation of reservoir volumes using volumetric, material balance and production decline methods.
• Estimation of well deliverability from various sources such as basic reservoir parameters, absolute open flow (AOF) tests, in-line flow tests, production decline and analogy.
• Theory and practical application of single-phase gas and two-phase gas-liquid pressure loss correlations.
• Presentation of basic compressor theory from the standpoint of a reservoir/production engineer and the inter-relationship with field deliverability.
• Discussion of how to model proposed gathering systems and how to model existing gathering systems. This portion will focus on the modeling methodology developed by Fekete.
• Examples to show the evaluation of booster compression, addition of new wells, and line loops. The goal is to produce accurate production forecasts for proposed changes to the gathering system.