Abstract
In this project, low-salinity water flooding has been modeled on ECLIPSE black oil simulator in three cases for a total field production life of twenty-five years. In the first case, low-salinity water flooding starts fifteen years after secondary water flooding. For the second case, low-salinity water flooding starts five years after secondary water flooding and runs till the end of the field production life. For the third case, low-salinity water flooding starts five years after secondary water flooding, but low-salinity water flooding is injected in measured pore volumes for a short period of time; then, high-salinity water flooding was resumed till the end of the field production life. This was done to measure the effect of low-salinity water flooding as slug injection. From the three cases presented, oil recovery efficiency, field oil production rate, and field water cut were observed. Increased percentages of 22.66%, 35.12%, and 26.77% were observed in the three cases, respectively.
Highlights
Secondary injection schemes have majorly been carried out on oil reservoirs to improve oil recovery after the depletion of the natural energy of the reservoir [1]
Several researches have been carried out to understand the mechanisms behind low-salinity water flooding as it relates to increasing oil recovery, but no mechanism has been singled out to be the main mechanism responsible for the low salinity effect
Injection schemes might be useful to marginal field operators who need to implement a simple and cheap enhanced recovery method
Summary
Secondary injection schemes (water and gas injections) have majorly been carried out on oil reservoirs to improve oil recovery after the depletion of the natural energy of the reservoir [1]. Options for enhanced oil recoveries are screened majorly on reservoir fluids and rock properties and costs of implementation all with respect to the amount of oil to be recovered. Several researches have been carried out to understand the mechanisms behind low-salinity water flooding as it relates to increasing oil recovery, but no mechanism has been singled out to be the main mechanism responsible for the low salinity effect. Among these mechanisms are fines migration, mineral dissolution, wettability change, double-layer expansion, and multicomponent ion exchange (MIE) [4, 5]
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