The Strataflow Process: A Recent Development in Locating Water Entry in Wells
- Ralph E. Hartline (Stanolind Oil and Gas Co.) | Wilfred Tapper (Halliburton Oil Well Cementing Co.)
- Document ID
- Society of Petroleum Engineers
- Journal of Petroleum Technology
- Publication Date
- July 1952
- Document Type
- Journal Paper
- 183 - 186
- 1952. Original copyright American Institute of Mining, Metallurgical, and Petroleum Engineers, Inc. Copyright has expired.
- 1.14 Casing and Cementing, 2.2.2 Perforating, 5.2 Reservoir Fluid Dynamics, 4.3.4 Scale, 5.6.1 Open hole/cased hole log analysis, 4.2.3 Materials and Corrosion, 4.1.5 Processing Equipment, 3 Production and Well Operations, 5.6.4 Drillstem/Well Testing
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The Strataflow process for locating water entry in producing wells is nowavailable. This method as now practiced utilizes the fact that fluids ofdifferent salinities have different electrical resistivities. By introducinginto the well a fluid of a markedly different salinity than that of the fluidbeing produced, a pronounced resistivity change will occur at the point ofentry. By running a Strataflow survey the points of major and minor water entrymay be interpreted from changes in the resistivity of fluid in the hole.
Strataflow results are obtained with the well operating under almost normalproducing conditions, and are a logical primary step in any workover program,having as its purpose shutting off of the water.
Water production is a serious problem in many producing oil wells. Itcertainly increases lifting costs and in some cases presents a disposalproblem. It often aggravates corrosion problems and can even endanger oilproduction. With accurate information to guide an effective workover program,many marginal wells could be restored to profitable production.
The shortcomings of previous methods of water entry location wererecognized. The Strata flow process is the result of several years ofdevelopment and field testing directed toward overcoming these limitations. Itrepresents the continued development of a process reported by Silverman andBrown. The earlier work established the basic soundness of fresh-to-salt waterresistivity contrast in delineating zones of water entry, but its applicationwas limited by the difficulty of maintaining static balance of the well duringpreparation for the test. A more serious deterrent to its use, however, was itsunadaptability to existing well logging service equipment and field operatingmethods.
The general principle of the new method involves, first, conditioning thewell by displacing the fluid in the bore of the well adjacent to the zone to betested by a conditioning fluid which is miscible with the formation fluid. Thisdisplacement is carried out without interruption of the well production. Theconditioning fluid must have some measurable physical, chemical, nuclear, orelectrical property which is distinctive from that of the formation fluid.
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