EOR of deep waterflooded reservoir with low porosity and permeability is challenged by low heat efficiency of conventional thermal process. Conventional chemical process like surfactant flooding also has some risk because of high oil viscosity and water channeling along fractures since the wells are hydraulically fractured. The conventional waterflooding can only last for a short period of effective production and low water cut level, and the performance enhancement by EOR operations will be greatly reduced after water cut reaches to a high level. Therefore, it is quite urgent to make and apply reasonable EOR strategy for this kind of reservoirs.

In this paper, the experiments were carried out to evaluate the potential of continuing conventional waterflooding and the performance of enhancing water temperature and change of injection agents, which optimized that the hot water foam flooding would be the best choice in terms of oil viscosity reduction, conformance profile control and oil displacement efficiency enhancement[13]. Based on the 3D geologic modelling, the waterflood target area was extracted and upscaled as the numerical simulation model to make history match and the residual oil saturation analysis. According to the current well status and well spacing, the reservoir engineering optimization was conducted to optimize the foaming system, converting timing and paramters of production and injection. Based on the reservoir engineering design, the hot water foam flooding was implemented from Janurary 2014, and the production performance is quite encouraging, which has the significant guidance for the EOR of similar deep heavy oil reservoirs.

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