Experimental device and experimental method for thickened oil pool mixed nano-fluid alternating CO2 microbubble flooding
A nanofluid and heavy oil reservoir technology, which is applied in the direction of production fluid, earthwork drilling, wellbore/well components, etc., can solve the problems of reduced plane and vertical sweep coefficient, poor development effect, high viscosity of heavy oil, etc. To achieve the effect of expanding the longitudinal sweep coefficient, inhibiting gas channeling and gravity overriding, and improving the expansion of crude oil
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Example Embodiment
[0085] Embodiment 1,
[0086] like figure 1 shown.
[0087] A mixed nanofluid alternating CO in heavy oil reservoir 2 Microbubble flooding experimental device, including high-precision constant-speed and constant-pressure pump (1), CO 2 container (2), live oil container (3), simulated formation water container (4), mixed nanofluid container (5), control valve (6), pressure gauge (7), lower injection port (8), middle injection port (9), the upper injection port (10), the inlet cover plate (11), the bolt (12), the sealing ring (13), the outer body (14), the first pressure measuring point (15), the second pressure measuring point ( 16), third pressure measuring point (17), outlet cover plate (18), extraction port (19), back pressure valve (20), back pressure control system (21), gas-liquid separator (22), electronic balance (23), gas metering system (24), vacuum pump (25), incubator (26), computer (27), pressure acquisition system (28), displacement model (29), filter screen ...
Example Embodiment
[0096] Embodiment 2,
[0097] Mixed nanofluids alternate CO in heavy oil reservoirs as above 2 The experimental method of the microbubble flooding experimental device includes the following steps:
[0098] 1) Install and fill the displacement model with quartz sand.
[0099] 2) Prepare fluids for injection, including live oil, simulated formation water, mixed nanofluids, and CO 2 gas.
[0100] 3) Evacuate the air in the displacement model, so that the displacement model is in a vacuum state.
[0101] 4) Inject simulated formation water and active oil, and measure the porosity, permeability and initial oil saturation of the displacement model.
[0102] 5) Depleted production stage of heavy oil reservoir: reduce the displacement model pressure to the target reservoir pressure. During the pressure drop process, the oil production, gas production and pressure of each pressure measurement point were recorded, and the cumulative production gas-oil ratio and recovery degree were...
Example Embodiment
[0153] Embodiment 3,
[0154] In this example, the experimental equipment is the same as that in Example 1, and the difference between its experimental method and Example 2 is:
[0155] In the step 4), the amount of simulated formation water injected in the process of saturating the simulated formation water is 1108.97 cm 3 , so the displacement model porosity is 36.02%.
[0156] The permeability data of simulated formation water at different injection rates are shown in Table 2.
[0157] Table 2 Permeability under different injection rates in Example 3
[0158]
[0159] Then the final permeability of the displacement model is 6.93 μm 2 .
[0160] The original reservoir pressure is 8.7MPa, and the injected live oil volume is V 油注 and the volume of crude oil produced, V 油采 1670.67cm respectively 3 and 639.72cm 3 , so the initial oil saturation is S oi = 92.96%.
[0161] In the step 5), the target reservoir pressure is 6MPa. During the pressure drop process, record...
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