Preheating device and method for heavy oil reservoir
A technology for heavy oil reservoirs and preheating devices, which is applied in earthwork drilling, production fluids, boreholes/well components, etc., and can solve the problems of restricting SAGD production of medium-deep heavy oil reservoirs and circulation pre-heating of medium-deep heavy oil reservoirs. Problems such as difficult realization of heat and limited application range, etc., to achieve uniform, effective and high-speed formation of heat communication, avoiding the output of steam and heat, and expanding the application range
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[0089] Example 1:
[0090] An oil reservoir in Xinjiang has a depth of 200m, a reservoir thickness of 10m, a reservoir permeability of 2000md, and a reservoir temperature of 18°C; the degassing viscosity of crude oil at reservoir temperature is 500,000 mPa.s, the oil saturation is 75%, and the reservoir dip is 6°. Circulating preheating injection-production parameters: bottom hole dryness 75%, maximum steam injection pressure 2.0MPa. Electric heater parameters: operating temperature 250°C, heating power 150KW. Nanofluid parameters: SIC nanoparticles have a diameter of 13nm and a volume concentration of 1.5%.
[0091] 1) Screening according to the characteristics of the reservoir, meeting the screening criteria of steam-assisted gravity drainage: reservoir depth 4m; Plane permeability of oil layer> 500 md, vertical permeability of oil layer> 200md; Crude oil viscosity> 2000mPa.s; oil saturation> 50%; net gross ratio> 0.7;
[0092] 2) The horizontal section of the upper horizontal...
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[0097] Example 2:
[0098] In actual reservoir applications, comparisons were made between steam cycle preheating and nanofluid-assisted electric heating preheating startup methods. The basic parameters of the reservoir: porosity 30%, oil saturation 75%, permeability 2000md, oil layer thickness 10m, crude oil degassing viscosity at reservoir temperature of 500000mPa.s. Circulating preheating injection-production parameters: bottom hole dryness 75%, maximum steam injection pressure 4.0MPa. Electric heater parameters: operating temperature 250℃, heating power 200KW. Nanofluid parameters: Al2O3 nanoparticle diameter 10nm, volume concentration 2%.
[0099] The basic parameters of the well pattern: the length of the horizontal section is 200m, and the spacing between the upper and lower horizontal wells is 5m.
[0100] The effect and efficiency of the two preheating methods are compared:
[0101] 1) Conventional cycle preheating for 200 days, heating the formation between horizontal wel...
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