To understand fluid mechanics in a flooded oil reservoir the relative permeabilities were measured by the use of both natural oil sands and artificial oil sands. Results obtained are as follows: (1) Relative permeability curves of cores taken from different parts of an oil reservoir are not always same. This means that, for instance, a time of water breakthrough and an oil recovery differ partly in the same reservoir. (2) In oil sands which contain clay, oil is able to blow at a part of high water saturation. This means that, when waterflooding is applied, higher oil recovery is obtained in dirty oil sands than in clean sands.
For the purpose of improving the water injectivity for waterflooding, experiments on the injection of water using both oil field brine and artificial brine were carried out. Results obtained are shown on figures in this paper. These figures show that oil sand which contains clay is very sensitive to salinity of water and, therefore, permeability of the oil sand is extremely reduced by low salinity water.
This paper is concerned with laboratory corrosion testings for a mild steel and a 2" iron pipe, related to waterflooding. The purpose of these testings is to select the kinds of corrosion inhibitors, and to seek the relationship between corrosion rate and the other factors. We obtained some results about the following points; (1) The testing solution of “Sarukawa” sea water is compared with those of other water in corrosion rate. (2) The properties of “Sarukawa” sea water are explained from a corrosive standpoint. (3) The effects of corrosion inhibitors are shown as experimental results. (4) The performance of pH value and Redox potential for corrosion rate are experimentally presented.