The methodology for calculating the apparent water absorption index from test injection data

Abstract

After the oilfield enters the medium-high water content period, the treatment problem of produced water becomes more and more prominent, and the same-well injection technology can realize the oil-water separation of the produced fluid at the well. The separated water is injected back into the oil reservoir by the injection pump, while the oil-water mixture with higher oil content is lifted to the surface by the extraction pump. However, once the tampering operation is carried out on the production layer, the fluid production capacity of the layer cannot be judged, and it is impossible to determine the reasonable production allocation of the injection and recovery layer. Moreover, in the normal production process, the production tubing can not be taken out normally, so it is difficult to determine the production capacity after blocking by logging method. Therefore, it is necessary to carry out theoretical research on the production capacity of the same injection and recovery wells after tampering according to the method of reservoir engineering, so as to provide a theoretical basis for the reasonable production allocation in the field.