The BDM Corporation, under contract to the Department of Energy/Morgantown Energy Technology Center, is collecting geologic and engineering data on Devonian shales from 10 sites in the Appalachian, Michigan and Illinois Basins. As part of that project, three wells were drilled into, collected up to 60 feet of oriented core, and tested the Devonian Rhinestreet Shale in the Appalachian Basin. Those wells were: L. B. Southwick #1, Crawford County, Pennsylvania; P. D. McCartney #1, Mahoning County, Ohio; and A. B. Wilson #19, Wirt County, West Virginia.
The target areas for drilling the wells was based on data from the past EGSP. Shale thickness, thermal maturity, organic content and stress distribution were factors considered in target selection. Data collected from the wells confirmed the presence of the required factors in the target areas. Petrophysical testing of samples collected from the core indicate the porosity and permeability for the shale is low. The maximum porosity found was 6.8 percent and maximum permeability (at reservoir pressure and for a non-fractured sample) was 7.24μd.
Production testing in the wells yielded mixed results. The L. B. Southwick #1 initially had a production of 3,000 cf/d, but eventually fell off to 800 cf/d. Core samples from the P. D. McCartney #1 had large volumes of gas initially desorbed, but the well yielded no production when tested one week after completion. The A. B. Wilson #1 was able to maintain a flow rate of 8 Mcf/d.
The L. B. Southwick has been stimulated using explosives. Preliminary indications are that it had minimal effect on production. Plans are in progress to foam fracture the P. D. McCartney.