Heterogeneous Compound Flooding Technology for Medium-High Permeability Consolidated Reservoir After Polymer Flooding

doi:10.7657/XJPG20210412

Abstract

Abstract:

The Ⅳ1-3 layers in Eocene Hetaoyuan formation in Shuanghe oilfield are characterized by high temperature and medium-high permeability. At present, the layers have entered a development stage with ultra-high water cut after polymer flooding, and it is necessary to further improve the recovery. Heterogeneous compound flooding system can effectively expand swept volume, improve oil displacement efficiency, adjust production and injection profiles, control water production and increase oil production. We studied the long-term thermal stability of the system based on viscoelasticity and interfacial activity. Using a single core, we investigated the injectability and moving style of the heterogeneous compound system in reservoir. Through a parallel core displacement experiment, we evaluated the oil displacement effect of the system. The research results show that the heterogeneous compound flooding system is viscoelastic and its elasticity is dominant. The viscosity of the heterogeneous compound flooding system is 58%~197% higher than a conventional polymer flooding system, and the elastic modulus of the former is 67%~227% higher than the latter. The interfacial tension of the heterogeneous compound flooding system is at the magnitude of 10 ^-3 mN/m, so it is good at displacing oil. In addition, the heterogeneous compound flooding system can keep thermal stability for a long time. For example, after 180 days of aging, the retention rates of the viscosity and the elastic modulus exceed 100%, and the interfacial tension is still at the magnitude of 10^-3 mN/m. The system has good injectivity, which can further increase the recovery by 16.93% after high-strength polymer flooding. The system moves in reservoirs in ways of migrating, accumulating, plugging, and deforming to move. By displacing the residual oil bound by the capillary force in less permeable zones, the heterogeneous compound flooding system can significantly reduce oil saturation. This research expands the application of the heterogeneous compound flooding from unconsolidated oil reservoirs at low temperature, and with high porosity and high permeability to consolidated reservoirs at high temperature, and with medium to high permeability.

Key words: Shuanghe oilfield, viscoelastic granular oil-displacing agent, polymer flooding, heterogeneous compound flooding, consolidated reservoir, viscoelasticity, injectivity, thermal stability, migration mode

CLC Number:

TE357

ZHANG Zhuo, WANG Zhengxin, XUE Guoqin, LI Yan, LIU Yanhua, WANG Xi. Heterogeneous Compound Flooding Technology for Medium-High Permeability Consolidated Reservoir After Polymer Flooding[J]. Xinjiang Petroleum Geology, 2021, 42(4): 475-479.

Figures/Tables 7

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