A steam flooding oil recovery method based on flue gas composition optimization
A flue gas and steam flooding technology, which is applied in the fields of fluid extraction, earthwork drilling, climate sustainability, etc., can solve the problems such as the inability to fully utilize the advantages of flue gas-assisted steam flooding, and achieves improved development effects and expanded The effect of heat spread and production cost reduction
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Embodiment 1
[0040] A system for implementing an oil recovery method based on optimized steam flooding of flue gas components, such as figure 1 As shown, it includes a gas injection module and a foaming agent module. The gas injection module includes a steam injection boiler generator 8, a flue gas condensing filter device 9, a flue gas storage device 11 and a first booster device connected in sequence. 12. A membrane separation device 10 is also connected between the flue gas condensation filtering device 9 and the flue gas storage device 11 through a three-way valve 14, and the foaming agent injection module includes a foaming agent solution storage device connected in sequence. 13 and a second booster device 15, the steam injection boiler generator 8, the first booster device 12 and the second booster device 15 are all connected to the injection well 2 of the oil reservoir.
Embodiment 2
[0042] Use the oil recovery method of above-mentioned embodiment 1, specifically comprises the following steps
[0043] S1. After the flue gas 7 generated when the steam 5 is produced by the steam injection boiler generator 8 is processed by the flue gas condensing and filtering device 9, it directly enters the flue gas storage device 11 through the three-way valve 14 (or through the three-way valve 14). First, the ratio of nitrogen and carbon dioxide in the flue gas 7 is adjusted to the ratio 1 through the membrane separation device 10, and the ratio of nitrogen to the flue gas 7 in the ratio 1 is M, 75%≤M<100%), and then enters the flue gas storage device 11;
[0044] S2. Simultaneously inject the mixture of the steam 5 produced by the steam injection boiler generator 8 and the flue gas 7 pressurized by the first pressurizing device 12 into the formation along the injection well 2 to form a stable temperature in the heavy oil reservoir 4 field (i.e. steam chamber 6);
[00...
experiment example 1
[0063] Under the simulated experimental conditions, this method was used for the heavy oil reservoir (this reservoir simulates ordinary heavy oil reservoir, the reservoir temperature is 56 °C, the permeability is 2183 mD, the oil saturation is 93.2%, the porosity is 28.55%, The viscosity of the heavy oil is 326mPa·s at 50℃. The back pressure of the model outlet is set to 1MPa, the inner diameter of the experimental oil displacement model is 2.54cm, the length is 60cm, and three temperature detection points are installed at 15cm, 30cm, and 45cm) for displacement. , the specific operation steps are as follows:
[0064] S1. Adjust the ratio of nitrogen and carbon dioxide in the flue gas, so that the nitrogen in the flue gas is more than carbon dioxide, this ratio is ratio 1, and M=90% in ratio 1;
[0065] S2. In the first stage of displacement, inject a mixture of steam and the flue gas adjusted to a ratio of one in step S1 into the formation to form a stable temperature field do...
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