The author applied method of dimensional analysis to 2-fluid flooding problems in dipping reservoirs. The principal results obtained are as follows. 1) Applying the method to 2-well system (Fig. 2), we can see the outlines of these following items. Pressure distribution (Eq. 1), well-pressure difference (Eq. 2) and breakthrough time (Ep. 3) are obtained when both injection rate and production rate are constant. Pressure distribution (Eq. 4), injection rate, production rate (Eq. 5) and breakthrough time (Eq. 6) are as well obtained when injection pressure and production pressure are constant. 2) Similarly when the method is applied to multiple-well system (Fig. 3) the following items come into our possible insight. Pressure distribution (Eq. 7), well-pressure difference (Eq. 8), break-through time (Eq. 9) and sweep efficiency (Eq. 10) are obtained when injection rate and production rate are constant. And, again, pressure distribution (Eq. 11), injection rate, production rate (Eq. 12), breakthrough time (Eq. 13) and sweep efficiency (Eq. 14) are obtained when injection pressure and production pressure are constant. 3) Dimensions of various quantities in general flooding problems are shown in Table 1. 4) Dimensionless quantities in general flooding problems are enumerated in § 6.1 and § 6.2.
In this paper the writer has dealt with the depression of the basin in which the Kotambetsu formation was deposited. The Kotambetsu formation, which has very broad distribution with the equivalent Kawabata and Masuporo formations in the western side of the meridional mountain range of Hokkaido, shows very characteristic condition of sedimentation such as tramendous thickness, remarkable development of cyclothem, existence of slump sheets or balls in the formation, and etc. These remarkable features on sedimentation caused from the depression reached to 6, 300m. deep, which had been continued during the deposition of the Kotambetsu formation. The movement long continued in Miocene age must be noticed in the area where the formation equivalent to the Kotambetsu formation developed.