With the implementation in November 1993 of FERC Order 636, the responsibilities and contractual obligations for a Gas Transmission Company operating Gas Storage have changed. Among these responsibilities is the ability to deliver gas from storage in a timely manner as specified by gas storage contracts.

To ensure that their deliverability obligations are met, a program has been implemented to review well performance and to re-work wells where deliverability can economically be improved. This program is aimed at maintaining or improving deliverability from wells and monitoring their future performance.

Re-working existing wells has proven to be an economically successful method of maintaining deliverability compared to drilling new wells to meet this purpose. Re-working can be broken into two groups of wells: wells that have mechanical problems that need to be corrected or wells that need some type of stimulation treatment. In developing a rework program, several things need to be addressed such as: a candidate recognition program, the design of the work to be performed, execution of that work, and the evaluation of the results obtained along with the economics.

The Deliverability Improvement Program is in its third year. It has developed from a small pilot program to a substantial part of normal storage activities. The purpose of this paper is to review the processes used to find candidates to work on and an evaluation of work performed.

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