Some Case Histories of Remedial Work Resulting from Water Tracer Surveys
- Walter O. Ford Jr. (Ford Well Logging Co.)
- Document ID
- Society of Petroleum Engineers
- Journal of Petroleum Technology
- Publication Date
- July 1966
- Document Type
- Journal Paper
- 791 - 797
- 1966. Society of Petroleum Engineers
- 2.2.2 Perforating, 2.4.3 Sand/Solids Control, 3 Production and Well Operations, 3.2.2 Downhole intervention and remediation (including wireline and coiled tubing), 6.5.2 Water use, produced water discharge and disposal, 1.6 Drilling Operations, 5.4.1 Waterflooding, 1.14 Casing and Cementing, 5.2 Reservoir Fluid Dynamics, 5.6.5 Tracers
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Use of water tracer surveys to improve the over-all performance of waterfloods has long been recognized. Remedial work to water injection wells is becoming more important as the ratio of secondary reserves to primary reserves increases. While the proper use of tracer surveys does not necessarily mean a workover after every survey, too little significance is often given surveys where they could be of real productive use. This paper lists several case histories where tracer surveys were run and properly analyzed, resulting in thoughtful remedial work. What actual effect this remedial work had on production in the immediate area it also shown, when available.
During the past 10 years, waterflood operators have tended to rely more on the use of quantitative water injection profiles. Though there are several different types and methods being used today to obtain this quantitative information, this paper will not discuss their principles or merits; rather, the assumption is made that quantitative water injection profiles can be run by a variety of service companies. Concern over what can and has happened from this point is the basis of this paper. This work was undertaken to present evidence from actual case histories where water tracer surveys were used, relied upon and found capable of being highly informative and of utmost practical value. During the search for such histories, an effort was made to stay away from examples where evaluation of remedial work could only be done at the injection well. Instead, examples are sought where direct production results confirmed proper water tracer survey evaluation of injection well remedial work, regardless of its success. This had a tendency to lead the author away from any but the most positive cases-where any cause for production changes, other than the success or failure of the remedial work, was extremely remote. Case History 5 is somewhat of an exception to this aim.
Case History 1
This case history was taken from a dolomite flood in which a northwest-southeast breakthrough system had been indicated (Fig. 1). Well 63 was converted to water injection in March, 1964. By June, 1964, Well 124 started to increase in water production with no increase in oil production (Fig. 2). This trend continued until Well 124 was producing over 100 BWPD and very little oil (2 to 3 B/D).
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