Coring and testing wells Asphalt Ridge, Utah

A second well was cored and some injection and production tests were made using this well and the well that already existed on Gulf's Palmer lease at Asphalt Ridge, Utah. The formation that has been tested is the Duchesne River, which is more lenticular and erratic than the Mesa Verde which contains most of the reserves of bitumen at Asphalt Ridge. The zone from 610 - 652 feet that had a bitumen content of 5.5 percent by weight was also present in the second well and had about the same bitumen content. Coring was continued in the second well to a depth of 855 feet and no more bitumen saturation was found. Air was injected at well #1 and half of the injected volume was produced at well #2. The oxygen content of the produced air increased rapidly to 21 percent. Permeability profiles run at both wells indicated that the gas did not enter the pay uniformly and the entrance of gas was not confined to the bitumen saturated section. The distribution of gas entry was localized so that it appeared that fractures were taking the gas. However, with the iso-flow technique using air and propane it was not possible to pinpoint the interface closer than a foot or two in depth.