Abstract
The purposes of the study are (1) to make clear the history of the proceeding water front under the conditions shown in Fig. 2, (2) to calculate the sweep efficiency of the system, and (3) to inspect the effects of the edge water line on the sweep efficiency. In Fig. 3 the results of calculation are shown. A relaxation method is used in the study. The sweep efficiency of 37.1% was obtained. It is assumed that the four edge water lines are between the rows of input-wells and outputs-wells. Each line is 5 meters, 10 meters, 15 meters and 20 meters apart from water injection wells. The behavior of the edge water was determined (see Fig. 6, Fig. 7, Fig. 8 and Fig. 9). The sweep efficiencies under such conditione were 49.3%, 48.8%, 49.2% and 46.6%. The ratios of the area invaded by edge water to the area EBCF are each 75.5%, 76.3%, 79.2% and 77.5%. Accordingly, we must carry out any other plan within the area AEFD for increasing efficiency in this system.
