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Description
Ultra-deep oil and gas reservoirs are commonly characterized by extreme geological and downhole conditions, including high temperature, high pressure, and strong heterogeneity. These conditions make it difficult for conventional hydraulic fracturing to achieve balanced stimulation across multiple layers. To address this issue, this study investigates a soft zonal isolation technology based on temporary plugging. A three-dimensional hydraulic fracturing model with interlayer heterogeneity was established using well-log interpretation and rock mechanical parameters, and the controlling effects of interlayer differences in minimum horizontal stress and Young’s modulus on the vertical propagation of fractures were clarified. High-temperature and high-pressure plugging experiments with irregular perforations were conducted to evaluate the plugging and pressure-bearing performance of temporary plugging agents under complex perforation conditions, and a composite temporary plugging-agent formulation was developed. Combined with visualization experiments on temporary plugging-agent transport and numerical simulation, an optimization method for the temporary plugging injection process was proposed. Field application results show that this technology can effectively plug dominant flow channels, promote fluid redistribution into understimulated layers, and achieve balanced stimulation of multiple vertical layers, resulting in a 20%–30% increase in single-well productivity. The results provide a theoretical basis and engineering guidance for flexible zonal stimulation in ultra-deep reservoirs.
| Country | China |
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