The Hot-film Log--a Formation Evaluation Tool Designed for Shallow In-situ Oil Shale Experiments.
46th Ann Fall Meeting SPE AIME New Orleans Louisiana 1971 Oct; :12 pages
The hot-film flow log was developed for evaluating shallow in situ fracturing and retorting (combustion) experiments in Green River oil shale. Two logging probes are described which employ a temperature- compensated conical, hot-film anemometer-type flow sensor. Wellbore fluid-flow profiles and fluid entry or exit points can be recorded while continuously lowering or raising the probes in cased or uncased wellbores. Natural, hydraulic, and explosive fractures in oil shale have been evaluated by a combination of air injection, air production, and flow logging techniques. Fracture depths, types (horizontal or vertical), and flow characteristics within a single borehole or a system of boreholes can be interpreted from the logs. Gas flow profiles in in situ retorting experiments can be determined before ignition, curing formation combustion, and after combustion termination. Limitations and potential applications are discussed.
46th Ann. Fall Meeting SPE, AIME, New Orleans, Louisiana, Oct. 3-6, 1971, Preprint Spe-3501