A preprocessing method to improve the development effect of sagd
A technology with development effect and pretreatment, which is applied in the fields of production fluids, earthwork drilling, wellbore/well components, etc. It can solve the problems of expanding the expansion range of the steam zone, easy steam channeling, and increasing the volume of steam transversely sweeping, etc. Fluidity and thermal conductivity, strong thermal diffusion and conduction, and the effect of increasing seepage capacity
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Embodiment 1
[0034] The present embodiment provides the pretreatment method that improves SAGD development effect, and this method comprises the following steps:
[0035] Reservoir characteristics: An oil reservoir in Liaohe, the reservoir depth is 550m, the porosity is 30%, the oil saturation is 75%, the permeability is 2000md, the reservoir thickness is 55m, the reservoir temperature is 35℃, and the degassed viscosity of crude oil at the reservoir temperature is 230000mPa·s .
[0036] 1) Well layout method: Drill a horizontal well at the bottom of the reservoir with a length of 400m and a distance of 5m from the bottom of the reservoir. Drill 8 vertical wells on both sides of the horizontal well with a distance of 40m from the horizontal well. The perforations are deployed in the middle of the reservoir Location.
[0037] 2) CO 2 Pretreatment stage: the first round of injection of 2 million cubic meters of supercritical CO under standard conditions 2 For gas, the formation fracture pr...
Embodiment 2
[0043] The present embodiment provides the pretreatment method that improves SAGD development effect, and this method comprises the following steps:
[0044] Reservoir characteristics: An oil reservoir in Xinjiang, the depth of the reservoir is 400m, the thickness of the oil layer is 15m, the permeability of the oil layer is 1500md, and the temperature of the oil layer is 18°C; the degassed viscosity of crude oil at the reservoir temperature is 50000mPa·s, the oil saturation is 75%, and the dip angle of the oil layer is 8° , Injection-production parameters: bottom hole dryness 75%, maximum steam injection pressure 3.5MPa.
[0045] 1) The length of the horizontal well section is designed to be 360m. One horizontal well is deployed in the middle and upper part of the reservoir as a steam injection well, and another horizontal well is deployed parallel to the horizontal well 5m away as a production well. The steam injection well is 7m away from the bottom boundary of the reservoir...
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