To block big pore throats and channels, caused by high-temperature steam, in vicinity of injection wells of steam flooding, profile control agent should be inject. For the optimum effect, its properties should include excellent heat resistance and some permeability after consolidation, which is beneficial for improvement of sweep coefficient.
In this paper, we do a study on how to synthesize a novel granular profile control agent and evaluate its properties. The basic procedure includes synthesis material selection, synthesis method optimization, consolidation properties test (setting time, consolidation strength and heat resistance) by orthogonal experiments and simulation experiments by heterogeneous parallel dual-core flooding tests.
Results show that profile control agent is self-cemented, inorganic particle with the scale of mm, matching the scale of big pore throats and channels in vicinity of injection well. Initial setting time greater than 7h, consolidation strength up to 3.5MPa and excellent heat resistance can ensure its feasibility and completeness in high-temperature steam. Profile control agent with proper size can form core with some permeability and porosity. The core formed has stable and flushing-resisting flowing channels. The relationship between permeability of core formed and diameter of particles is established, which means with known permeability ratio of formation, specific diameter and injection PV can be chosen to satisfy the homogeneity.