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• W1974732208 abstract "Abstract It is possible to set a special packer within the long completion horizontal interval to establish an injection zone and a production zone, and a new flooding scheme of simultaneous injection and production in a single-hole horizontal well drilled for developing thin marginal heavy oil reservoir or small block reservoirs or offshore reservoirs. In field practice, the fluids injection rate can be controlled with either concentric or parallel tubing strings. Reservoir numerical simulation was used to determine the formation thickness lower limitation for different viscosity reservoir and the optimum time to start steam flooding after steam soak by economic oil/steam ratio. The optimum time to start steam flooding is at the 7th cycle. There exists a peak recovery efficiency of steam flooding when the length of separation section ratio is 0.15–0.2. Oil recovery rate can be enhanced by increasing steam injection rate, but pressure difference also increase and the pressure difference increases sharply, and separation section by packer will not be in a stable state in the steam flooding process. A steam injection rate of 2.4t/(d.ha.h) was suitable for steam flooding under practical injection-production conditions. All the results could be useful for the guidance of steam flooding project. Introduction There is formation thickness limitation for vertical production well because of short well completion interval and lower production rate. Thin formation or high viscosity heavy oil reservoir is called marginal for commercial oil production. It will be convenient to make the oil inflow or outflow from the bottom hole of horizontal well because of its long completion interval in the formation (Joshi, 1988; Wang, 1995). Horizontal well is used more often in small block reservoirs or offshore reservoirs for the limitation of well space and cost of well drilling, so, the formation thickness limitation will be extensive for horizontal well, and it will be difficult to hold formation pressure maintenance and production rate for small block reservoirs. It is possible to separate the long completion horizontal interval with special packer for injection and production at same time(Huang et al, 2005). Concentric or parallel tubing strings and packer can be used to separate the horizontal well, and pressure difference of injection and production segment will be affected by the length of well and separated interval and injection rate and production rate. It is a dynamic coupled fluid flowing between reservoir and horizontal bole, segments of injection and production will affect both each other, so it is necessary to consider the pressure difference limitation of the packer for production rate dispatching of horizontal well, and to provide the guidance of field operation. Steamflooding is the following operation processes of steam simulation, the alternation of steam soaking to steamflooding can be used in long completion interval horizontal well after several cycles. This operation scheme will be performed in the same well bore, heat loss from injection tubing strings will be transferred to production tubing strings, and the steamflooding system will keep high thermal efficiency. It is necessary to find a desirable steam soaking cycle for the alternation to steamflooding, and the research on steamflooding operation schemes will be important for the guidance of field application also." @default.
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• W1974732208 date "2008-10-20" @default.
• W1974732208 modified "2023-10-16" @default.
• W1974732208 title "A New Flooding Scheme by Horizontal Well in Thin Heavy Oil Reservoirs" @default.
• W1974732208 doi "https://doi.org/10.2118/117313-ms" @default.
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