Method and device for determining oil reservoir foam seepage bubble generation and breaking speed

A technology of bubbles and foams, which is applied in the field of determining the formation and collapse speed of foam seepage bubbles in reservoirs, to achieve accurate calculation results and good oil displacement effects

CN113533337APending Publication Date: 2021-10-22CHINA UNIV OF PETROLEUM (EAST CHINA)
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2021-10-22

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Abstract

The invention belongs to the field of oil exploitation foam flooding, and discloses a method and a device for determining oil reservoir foam seepage bubble generation and breaking speed, and the method specifically comprises the following steps: introducing foam into a microscopic visual model, shooting a foam video within a certain time through a color camera, according to the method, videos at different moments are screenshot through computer software to obtain foam images at multiple time points, counting bubbles in the images through ImageJ, obtaining the breaking speed and the generating speed of the bubbles through calculation according to the formula, and therefore the stability of the bubbles in the porous medium is indirectly judged. The method for determining the bubble generation and breaking speed is easy, convenient, rapid and accurate to operate, after the bubble generation and breaking speed of oil reservoir foam seepage is determined, input parameters can be provided for a total amount balance model for simulating foam seepage, the calculation result of oil reservoir numerical simulation is more accurate, and foam flooding is helped to achieve a better flooding effect.
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Description

technical field

[0001] The invention belongs to the technical field of petroleum exploitation, in particular to a method and a device for determining the generation and collapse speed of foam seepage bubbles in oil reservoirs. Background technique

[0002] Following the polymer flooding technology, foam flooding has gradually become one of the technologies for enhancing oil recovery in oilfields at home and abroad. Foam flooding will form a mixed system of gas as the dispersed phase and surfactant solution as the dispersion medium, which has a much higher apparent viscosity than gas and surfactant solution, and its flow resistance when flowing in the oil layer is much higher than that of Water or gas is injected, thereby improving the mobility ratio of the oil displacement agent and crude oil, and increasing the sweep coefficient of the oil displacement agent. Foam is selective to formation permeability, "blocking high but not low", that is, foam has a strong plugging effec...

Examples

Embodiment 1

[0043] A device for determining the generation and collapse speed of foam seepage bubbles in reservoirs, including a foam generation unit, a microscopic visualization model, an image acquisition and analysis unit, and a back pressure control device:

[0044] Foam generating unit: including high-precision plunger pump 1, high-precision plunger pump 2, intermediate container A 3, intermediate container B 4 and three-way valve 5, the two inlets of three-way valve 5 are respectively connected to the upper end of intermediate container A3 The interface is connected to the interface on the upper end of the intermediate container B 4 through pipelines, the other end of the intermediate container A 3 is connected to the high-precision plunger pump 1, the other end of the intermediate container B 4 is connected to the high-precision plunger pump 2 2, and the intermediate container A3 contains There is a foam solution, and there is gas in the intermediate container B4; the outlet of the ...

Embodiment 2

[0049] A method for determining the formation and collapse speed of reservoir foam seepage bubbles with the device in embodiment 1, comprising the following steps:

[0050] (1) Foam generation

[0051] Add 2g of Sudan red dyeing agent into 500mL of 0.5% SDS aqueous solution and stir evenly to obtain a dyed foaming agent solution; inject 200mL of dyed foaming agent solution into the intermediate container A3, and pass 200mL of nitrogen gas into the intermediate container B In 4, set the injection speed of the high-precision plunger pump-1 to 25 μL min -1 , set the injection speed of the high-precision plunger pump 2 to 100 μL min -1 , set the pressure of the back pressure control device to 8MPa, and start the high-precision plunger pump 1 and the high-precision plunger pump 2 at the same time, so that the dyed foaming agent solution and nitrogen enter the microscopic visualization model 6 through the outlet of the three-way valve 5 entry port.

[0052] (2) Foam observation ...

Embodiment 3

[0065] In order to verify that this application can effectively prove the stability of the foam, use the device in Example 1 and the method in Example 2 to record a video with a duration of 120 minutes, take ten time points, calculate the generation and burst speed of bubbles, and then compare with The change trend of the number of bubbles was compared.

[0066] Select a time point every 10 minutes in the video saved in the computer within the time period of 0-120 minutes to take screenshots, and finally obtain 00:10:00, 00:20:00, 00:30:00, 00:40:00 , 00:50:00, 00:60:00, 01:10:00, 01:20:00, 01:30:00, 01:40:00 10 video screenshots. Calculate the number of bubbles at each time point, the total velocity of the bubbles in each time period, and the bubble collapse rate that tends to be stable, and calculate the bubble generation rate in each time period by formula (3). The results are shown in Table 1.

[0067] The number of bubbles at each time point is 2902, 3520, 3292, 2856, 26...