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Numerical Simulation for Division of Phase Zone Displacement: with Gao89 as an example |
WANG Jie, TAN Baoguo, LÜ Guangzhong |
Geoscience Research Institute, Shengli Oilfield Company, SINOPEC, Dongying 257015, Shandong Province, China |
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Abstract: Using the CO2 flooding to enhance the oil recovery is a development trend. The three displacement modes are the miscible, the near-miscible, and the non-miscible flooding modes. By means of expanding the oil volume, reducing the viscosity, decreasing the interfacial tension, and increasing the injection volume, the CO2 flooding can substantially enhance the oil recovery. The reservoir in the block Gao89 is of low porosity and ultra-low permeability. The oil in the block Gao89 is divided into eight pseudo components by the crude oil compound. The phase matching is done, including the volumetric factor, the oil density, and the oil viscosity. The MMP of the oil in this area is 28.94MPa. The simulation result agrees with that of the slime-tube test. With the numerical simulation, the production index is adjusted and the fracture distribution is obtained to accurately match the production performance. The static bottom hole pressure of the prediction agrees with that of the test, which verifies the simulation. Based on the numerical simulation for the block Gao 89 reservoir model, different displacement modes are established for the production gas oil ratio, the pressure relationship correlation diagram and the identification standards, with different gas saturations, interfacial tensions, and oil viscosities in different displacement patterns. Accordingly, the displacement pattern for the key well is identified. The method can serve as a guideline for the field application.
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Received: 28 November 2012
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