Water altering gas injection
2020
Abstract Gas injection by itself can maintain reservoir pressure and assist in oil recovery. Miscibility of injected gas with oil is very important and injection at high enough for miscibility pressures lead to improved oil recovery. Instability of gas displacement front leads to relatively fast gas breakthrough to the production wells and this is multiplied by low sweep efficiency. Adding displacement agents with high viscosity leads to better oil recovery. Just water can be injected in alternating with gas slugs and significantly improve oil displacement. This is so named WAG technique – Water Altering Gas. The technique can be further modified to include various methods of water and gas mixing and even by adding foam forming surfactants. Good understanding of interaction between reservoir and injected fluids is needed for the maximum process efficiency.
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