Profiling Water Injection Wells by the Brine-Fresh Water Interface Method
- Don R. Holbert (Sinclair Research Laboratories Inc.)
- Document ID
- Society of Petroleum Engineers
- Journal of Petroleum Technology
- Publication Date
- July 1957
- Document Type
- Journal Paper
- 11 - 16
- 1957. Original copyright American Institute of Mining, Metallurgical, and Petroleum Engineers, Inc. Copyright has expired.
- 3 Production and Well Operations, 2.4.3 Sand/Solids Control, 1.14 Casing and Cementing, 6.5.2 Water use, produced water discharge and disposal, 2.2.2 Perforating, 5.4.1 Waterflooding
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In order to attack the problem of channeling in water injection wells, it was felt necessary to have an accurate injection profiling means as a basic step. The means had to be capable of profiling injection wells that are permanently completed with cement-lined tubing which are heavily shot to produce highly irregular wellbores. The brine-fresh water interface method was chosen. The equipment and techniques developed for profiling by this method are described.
Experience has shown that the accuracy of the method is chiefly dependent upon the precision of the flow control systems and on allowing adequate time for stabilization of interface position. These operating limitations are discussed. The interface method can be broken down into the moving interface technique and the constant interface technique. The two techniques have been found to be complementary for obtaining injection profiles over a wide variety of conditions. For the constant interface technique, precision to .01 ft relative to other stations is common. This unusual degree of accuracy has led to the discovery of many instances where significant volumes of water are injected in very small vertical intervals. This indicates that channeling can be a problem even at moderate or low injection rates. In some cases the volumes of water injected have been so large and the formation intervals so small that flow through fractures rather than permeable streaks was considered probable.
It is possible that remedial procedures for fracture conditions could be quite different than remedial measures for permeable streak thief zones. The method accuracy and possible workover potential make interface profiling of practical significance for all types of water injection wells.
In order to efficiently water flood a formation it is desirable that the injected water enter uniformly into all strata of the formation. If this is not the case, but a substantial portion of the injected water channels through fractures or excessively permeable zones, the oil production will be associated with excessive amounts of water. This obviously would adversely effect the economics of the operation.
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