Abstract
Dump water flooding is a method utilizing a cross flow within a wellbore. The dumping water is established by the difference of flow potentials between a natural aquifer as a water source and an oil reservoir. Therefore, once the perforation is made into the both of aquifer and oil reservoir and the potential of aquifer is kept higher than that of the oil reservoir, water is continuously injected without any artificial drive. Obviously, the simple nature of the method indicates extreme dominance in economy. However, the injection performance is very sensitive with the conditions of aquifer and oil reservoir. Accordingly, the applicability of the method is highly limited. In the first part, the basic mechanism of dump water flooding is presented and the advantage and disadvantage of the method are briefly discussed. In the latter part, the examples of three projects in Khafji and Hout fields, Saudi Arabia are presented and the keys to the successful operation are briefly discussed.
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