A double-pipe SAGD long horizontal well uniform steam injection numerical simulation method considering coupling of an oil reservoir and a shaft
A technology for long horizontal wells and numerical simulation, applied in wellbore/well components, earthwork drilling, electrical digital data processing, etc., can solve the problems of unusable, predictable, unusable simulation calculations, etc., and achieve the goal of improving the uniformity of heating Effect
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[0145] Example 1
[0146] A numerical simulation method for uniform steam injection in a double-tube SAGD long horizontal well considering the coupling of reservoir and wellbore, such as Picture 8 As shown, the double-pipe SAGD long horizontal well pair includes steam injection wells and production wells. Both the steam injection wells and production wells are mainly composed of long tubing, short tubing and slotted screens. The long tubing runs to the toe end of the horizontal well. The short tubing is run down to the heel end of the horizontal well. The reservoir conditions when the injection-production well does not start production are the initial formation conditions. During the double-tube SAGD conventional steam injection process, the steam is injected from the heel end of the long tubing to the toe end, passing through the long tubing. The toe end enters the annulus of the horizontal well and flows from the toe end of the annulus to the heel end. The horizontal section o...
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[0252] Example 2
[0253] As described in Example 1, a double-tube SAGD long horizontal well uniform steam injection numerical simulation method considering the coupling of the reservoir and the wellbore. The difference is that the buried depth of the reservoir is 180m, the reservoir thickness is 20m, the porosity is 0.33, and the lateral permeability It is 2700mD, vertical permeability is 1890mD, original formation pressure is 0.22MPa, original formation temperature is 10℃, oil saturation is 0.75, horizontal section length of horizontal well is 800m, screen inner diameter is 209.1mm, outer diameter is 219.1mm, thermal conductivity coefficient 44.85W / (m·K); short tubing inner diameter 77.9mm, outer diameter 88.9mm, absolute roughness 0.00005m, thermal conductivity 0.8W / (m·K); oil layer thermal conductivity 5.2W / (m·K).
[0254] In Example 2, the double-tube SAGD conventional steam injection model was used to verify the accuracy of the model, and the calculation steps were the same a...
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