Physical Deliverability of Gas Reserves
- Ionel I. Gardescu (H. Zinder & Assoc. Inc.)
- Document ID
- Society of Petroleum Engineers
- Journal of Petroleum Technology
- Publication Date
- December 1960
- Document Type
- Journal Paper
- 25 - 29
- 1960. Original copyright American Institute of Mining, Metallurgical, and Petroleum Engineers, Inc. Copyright has expired.
- 4.2 Pipelines, Flowlines and Risers, 2.4.3 Sand/Solids Control, 5.7.2 Recovery Factors, 4.6 Natural Gas, 4.1.2 Separation and Treating, 5.6.4 Drillstem/Well Testing, 2.2.2 Perforating, 4.1.5 Processing Equipment, 5.2.1 Phase Behavior and PVT Measurements
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The rate at which oil and gas can be produced over the life of a field is of major importance in ascertaining the purchase value of a property, the security of a loan, or the assurance of a steady supply of oil and gas to a pipeline. This paper deals only with the problem of predicting the future production of gas wells.
The deliverability study presented is an illustration of a workable method of estimating the volume of gas-well gas available under certain conditions of field performance, contractual obligations and other physical and regulatory limitations. The study is based on exhibits and accompanying supporting data prepared for and submitted to the Federal Power Commission in a recent Certificate Case of Public Convenience and Necessity.
In connection with the estimation of gas reserves, two general terms are being used which, to avoid confusion, should be defined.
Recoverable reserves are estimates made of the ultimate volume of gas that can be produced profitably from a reservoir. In general, there is no restriction imposed as to the period over which the gas will be recovered or the rate of flow that has to be maintained.
Deliverable reserves are estimates made of the volume of gas that a reservoir or well can deliver during a given period of time, at a specified contractual rate of flow, against a certain wellhead pressure, under the prevailing physical conditions of the gas reservoir and the status of well development in the field, taking also into account any other contractual and applicable regulatory restrictions.
One of the main factors involved in the estimate of delivery is the computation of "physical deliverability" which shows the maximum rate at which a well can be produced under the existing characteristics of the reservoirs and lease operations. Thus, the physical deliverability is a ceiling beyond which a well or reservoir cannot be produced under given conditions. However, other restrictions may further curtail the rate of delivery below the estimated maximum physical deliverability volume.
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