It is known, the oil migrate to the bottom holes due to different types of reservoir energy. Depending on the type of reservoir energy one can single out primary, secondary, tertiary recovery. During the primary recovery stage reservoir drive comes fr om a number of natural mechanisms. These include: natural water displacing oil downward into the well, expansion of the natural gas at the top of the reservoir, expansion of gas initially dissolved in the crude oil, and gravity drainage resulting from the movement of oil within the reservoir from the upper to the lower parts wh ere the wells are located. Secondary recovery is based on the use of reservoir pressure maintenance systems. The reservoir energy in this case is replenished by water injection. Tertiary recovery, or enhanced oil recovery (EOR), methods increase the mobility of the oil in order to increase extraction. There are thermal, gas, chemical (polymers), microbiological methods and their combinations. The most common way to develop oil fields is secondary recovery. The use of waterflooding system allows maintaining reservoir pressure at a necessary level. The use of reservoir pressure maintenance systems requires to solve the problem of rational water injection ratio. This issue needs definition of the target injectivity of injection wells. To date, there are several approaches.
This article presents a method for calculating the target injectivity of injection wells adapted to the conditions of a group of fields of Slavneft-Megionneftegas characterized by equal geological and physical parameters. The authors described the main stages of the development of the methodology, and showed the effectiveness of the implementation of the methodology in the fields.
References
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