Delineation of subsurface fracture system in a petroleum reservoir: an experiment.
Komar CA; Shuck LZ; Overbey WK Jr.; Anderson TO
47th Ann Fall Mtg Soc Petrol Eng AIME San Antonio Texas, 10/8- 11/72 SPE Preprint 4048 :1-8
Short-duration pressure-interference tests were conducted to delineate the natural and induced subsurface fracture system in a petroleum reservoir near Bradford, Pennsylvania. The test site is a 36-acre lease with 16 five-spots. Pressure sensors were put in 40 wells. Pressure responses were measured before, during, and after each well was pressured at 1,400 psig for 30 minutes and 10 hours and at 2,000 psig (surface pressure) for 15 minutes. Responses were obtained at 300 to 1,000 feet from the injection well and were automatically recorded at preselected intervals ranging from 30 seconds to 1 hour. Small increases in pressure during various injection tests indicated near wellbore communication and the location, extent, and orientation of joints and fractures. The multi-sensor array demonstrated that hydraulic pressurization can be useful in delineating subsurface fracture systems in petroleum reservoirs and can help petroleum reservoirs and can help petroleum engineers establish patterns of injection and production wells to avoid premature waterfront breakthrough, thus increasing sweep efficiency and oil recovery from flooding operations.
47th Ann. Fall Mtg., Soc. Petrol. Eng., AIME, San Antonio, Texas, 10/8- 11/72, SPE Preprint 4048