Advantage of a Coordinated Formation Evaluation Program
- H.M. Shearin Jr. (Humble Oil & Refining Co.) | J.R. Latimer Jr. (Humble Oil & Refining Co.)
- Document ID
- Society of Petroleum Engineers
- Journal of Petroleum Technology
- Publication Date
- July 1955
- Document Type
- Journal Paper
- 11 - 15
- 1955. Original copyright American Institute of Mining, Metallurgical, and Petroleum Engineers, Inc. Copyright has expired.
- 4.3.4 Scale, 2.2.2 Perforating, 5.2.1 Phase Behavior and PVT Measurements, 5.4.2 Gas Injection Methods, 2 Well Completion, 5.4.1 Waterflooding, 1.6 Drilling Operations, 4.6 Natural Gas, 5.6.1 Open hole/cased hole log analysis, 1.10 Drilling Equipment, 5.6.2 Core Analysis, 1.11 Drilling Fluids and Materials, 1.6.9 Coring, Fishing, 5.5.2 Core Analysis, 5.2 Reservoir Fluid Dynamics
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The importance of obtaining sufficient reliable data on reservoirs has increased in recent years as wider use is made of reservoir engineering technology. These data can be obtained at minimum cost through a coordinated formation evaluation program during the development of a reservoir. Such a program and its benefits are outlined, and the results of the application of a program in a Strawn lime field is presented in this paper.
The growth of reservoir engineering over the past 15 years has caused a fundamental shift in the approach to the production of oil. The oil operator in the 1920's and 1930's was primarily concerned with finding a porous zone which would give up oil. He drilled with tools which were constantly improved, and gradually he learned to employ the newly developed logging devices which helped to locate the oil pays. Relatively speaking (compared with today), there were large amounts of oil to be found fairly cheaply at shallow depths. Exactly how much oil he found or about how long it would take to recover it was of concern to the operator, but how to determine these factors was not known at that time.
Today's outlook is different. There has been a shift from thinking about individual well behavior to thinking about the entire reservoir. The basic reservoir concepts of Schilthuis, Buckley and Leverett, and others have been tried and proved and expanded. Much was learned about reservoir theories during World War II when many reservoirs were produced at high rates without apparent damage. Today, reservoir engineering has progressed so that the behavior of a reservoir can be predicted with reasonable accuracy.
The reliability of reservoir performance predictions depends upon the accuracy of the reservoir data. As new oil reservoirs are found at deeper depths and are more costly to develop, accurate recovery predictions grow more important so that a proper evaluation of risks can be made. Today also finds a new and growing need for reliable recovery predictions to establish the feasibility of unitized operations.
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