Enhanced/Improved Recovery (EOR/IOR)

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It is well established that injection of PWRI or other fluids under matrix injection conditions or above fracturing pressures, both result in the generation of induced fractures. For injection under matrix conditions, matrix injection occurs initially but unless strict bounds are applied to the injection pressures, the injectivity reduces over time as the formation plugs. If constant injection rates are applied, the wells transition from matrix injection conditions to fracturing conditions.

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This has been recognised in the industry for over two decades. However, well placement and injection strategies rarely account for this. Poor well placement then leads to connectivity between the injector and producer, with the result of early water breakthrough, water recycling and poor sweep efficiency, impacting negatively the productivity and the secondary recovery project economics.