An Improved Water-input Profile Instrument
- R.J. Pfister (Pennsylvania Grade Crude Oil Association)
- Document ID
- Society of Petroleum Engineers
- Transactions of the AIME
- Publication Date
- December 1948
- Document Type
- Journal Paper
- 269 - 285
- 1948. Original copyright American Institute of Mining, Metallurgical, and Petroleum Engineers, Inc. Copyright has expired.
- 5.4.1 Waterflooding, 4.1.5 Processing Equipment, 2.4.3 Sand/Solids Control, 4.1.2 Separation and Treating, 4.3.4 Scale, 6.5.2 Water use, produced water discharge and disposal, 3.2.4 Acidising
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The development of a water-input profile instrument based on the introductionof brine and fresh water into an input well with the electrical location of theboundary developed between them is reported. Two methods are available in theuse of this instrument to measure the foot by foot water-intake rates of thevarious sand strata: the moving boundary method in which variable well borediameters can be determined and/or cancelled out and the constant boundarymethod. The type of results obtained and the relative advantages of each ofthese methods are described in detail.
Representative data are included covering the use of this instrument inexperiments involving selective acidizing, selective plugging, and selectiveshooting. In such experiments, this instrument has been used to diagnose theunfavorable distribution of water intake in input wells and also to determinethe effectiveness of the resultant treatments. The data included also serve toillustrate the type of problems which can be studied with this technique.
For ten years or perhaps longer a number of progressive water-flood operatorshave felt the need for some method to measure the foot by foot water-intakerates of various strata in water-injection wells. The primary need is todiagnose unfavorable water distribution in various strata and to evaluate theeffectiveness of the corrective measures such as selective acidizing, selectiveplugging, and selective shooting. Previously described methods for obtainingthis type of data were not considered entirely adequate. The profile equipmentdescribed in this paper embodies the separate introduction of brine and freshwater into the well at carefully measured and controlled rates and theelectrical location of a sharp boundary developed between these fluids.
At present this instrument is a research tool of value in determining theeffect of various well treatments on an individual sand strata. Its primary usehas been on wells in which different sections require different treatments(e.g., wells with an open sand to be plugged and a tight sand to be acidized).It has, thus, made possible the determination of a rearrangement of the waterintake of a well. The instrument can also be used to direct the treatingmaterial into a given zone. In completing a well the less permeable sands areshot more heavily with nitroglycerine in order to equalize the water intakebetween the permeable and less permeable sands. The extent to which suchcorrective shooting has been successful can be determined by a water-inputprofile. The combined profile and well-bore diameters should also provide amethod for determining the direction and effect of various selective shootingtechniques.
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