PERMFILE60195 - Laserfiche WebLink

Home Browse Search

Nir. Ed Baker Mazch 17, 2005 Page 3 During solution mining, NSI projects the 7H solution mining cavity will grow 30 ft updip along the strike of the well bore from the injection point. This cavity growth could cause planned cavity 7H to merge with cavity lA during the solution mining of cavity 7H. To insure cavity separation, AAI suggests that a conservative distance of 50 ft updip along the strike of the well bore from the injection point be used. Assuming that cavity lA does not have additional growth in the area adjacent to cavity 7H, AAI recommends that the sepazation of cavities lA and 7H be based upon (1) a rectangular, cavity cross section with the conservative 31.5-ft cavity height, (2) a safety buffer to accommodate the uncertainties of the tonnage allocation model and cross sectional shape, and (3) the additiona150-ft buffer to accommodate updip cavity growth from 7H. To accommodate the uncertainties in the cross sectional shape, a triangular, cross- sectional area was selected as the worst-case, cross-sectional shape. A triangular, cavity cross section projects widths two times greater than the rectangulaz cavity cross section. AAI recommends using the difference between the triangular cross section and the rectangular cross section as the safety buffer to accommodate both the uncertainty of the cavity shape and the uncertainties in the allocation model. Combining the 100.5 ft of the Januazy 2005 rectangular model estimated cavity radius with a 100.5-ft safety buffer radius, based upon the triangulaz cross section and the 50 ft to accommodate the cavity 7H growth during solution mining, results in the 7H well bore drilling to be truncated 251 fr from the cavity lA well bore. Attached is a map which includes the estimated footprint (cavity widths) from the January 2005 cavity allocation model, the 100.5-ft safety buffer radius azound cavity lA, and the 50 ft potential updip growth of cavity 7H. The map truncates the well bore of cavity 7H 251 ft from the well bore of cavity lA. Projecting the well bore path of 7H, using Well SH as a reference for both the radius for transitioning to a horizontal bore hole and the dip of the Lower Boies Bed, the 7H well bore will have a total measured depth of approximately 3,600-3,650 ft. The horizontal section of the well bore path is approximately 1,300-1,310 fr. Before drilling 7H, a series of coordinate tazgets should be established to enhance the accuracy of the well bore path and to aid in the control of the directional drilling. We believe that the location of 7H injection point, as shown in Figure 1, will result in isolation of cavity 7H from lA, but caution that the recommendation is based on best available information and assumed operating conditions projected into the future. Additional production from cavity lA or prolonged injection at the 7H injection point could result in cavity growth in excess of that projected, and hence, result in leakage from cavity 7H. Agapito Associates, Inc.