NIPER-705. PC-GEL: A Three-Dimensional, Three-Phase, Permeability Modification Simulator. IIT Research Institute, National Institute for Petroleum and Energy Research (NIPER). October 1993. 190 pp. NTIS Order No. DE94000104. Executable program. Min. Req.: IBM PC/AT, PS-2, or compatible computer with 640 Kbytes of memory. Math coprocessor optional. Note: When decompressing, be sure to use the -d or switch that recreates subdirectories.