EFFECT OF OIL TYPE ON SWEEP EFFICIENCY OF WATER INJECTION UNDER FRACTURING CONDITIONS PROCESS

Abstract. Water injection performance depends on the oil and petrophysical reservoir properties and fluid-flow characteristics. When water is injected into the reservoir at pressures above formation fracturing pressure, the effects of these properties over the reservoir model performance, and specially, on waterflooding sweep efficiency, become critical. Quantification of these effects, using parameters such as the Recovery Factor (RF) and Net Present Value (NPV), is important for the injection project dimensioning and to determine the feasibility and usefulness of the injection process to be implemented. The objective of this work is to quantify, using Sweep Efficiency and Net Present Value as study parameters, the effects of three different fluid models on the production performance during a waterflooding under fracturing conditions. The methodology proposed considers the simulation of scenarios in which the injectivity loss is represented by an analytical decline equation, and the fracture is represented using a virtual horizontal well. The results show the applicability of water injection under fracturing conditions in different oil type scenarios. Also, this work shows the importance of the reservoir parameters into the injectivity loss and fracture propagation models, and the significance of the RF and NPV in the quantification of these effects