Abstract
Unconventional oil reservoirs such as ultra-low permeability/tight oil/shale oil in China feature large reserves, dense reservoirs, fine pore throats, etc. The development conflicts are manifested as poor water drive development, large formation energy deficit, great production decline as well as low production and recovery rate, making it urgent for development realignment. The paper analyzes the development conditions, contradictions and rules of developed unconventional reservoirs through the method of decreasing production and numerical simulation of reservoirs, and proposes the comprehensive adjustment technology with “secondary waterflooding in advance, overall volume fracturing, inter-seam lateral displacement and imbibition oil recovery” as the core. Such approach is applied respectively to improve the formation energy, expand the crack-controlled reserves, form the injection and extraction replacement, and recover oil by oil-water replacement. Upon successfull implementation of this technology in ultra-low permeability reservoirs in Changqing Oilfield, the production of the old well exceeded the production of the well when it was initially put into production, which was five times that before the implementation, and the oil recovery rate upon implementation was three times that before the implementation, which is expected to increase the recovery rate by more than 10%, which is an important guideline for improving the production and recovery rate of a single well in unconventional old oil reservoirs.
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Wang, Jf., He, Db., Zhang, L., Wang, Jh. (2022). Comprehensive Adjustment Technology for Unconventional Developed Oil Reservoirs with Integrated Fracturing-Displacement-Imbibition Methods. In: Lin, J. (eds) Proceedings of the International Field Exploration and Development Conference 2021. IFEDC 2021. Springer Series in Geomechanics and Geoengineering. Springer, Singapore. https://doi.org/10.1007/978-981-19-2149-0_136
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DOI: https://doi.org/10.1007/978-981-19-2149-0_136
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