Device and method for testing diffusion coefficient of gas in saturated active oil core
A diffusion coefficient and core technology, which is used in the field of devices for testing the diffusion coefficient of gas in saturated live oil cores, can solve the problems of incomplete cores, difficulty in providing radial diffusion cores, and inability to conduct gas diffusion experiments in saturated live oil cores, etc.
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Embodiment 1
[0078] see figure 1 , a high temperature and high pressure diffusion holder, comprising a gas chamber 1, a core chamber 2 and a screw rod 3;
[0079] There is a gas channel 4 between the gas chamber 1 and the core chamber 2, the screw 3 is on the side of the gas chamber 1 to control the closing of the gas channel 4, and the screw 3 is arranged transversely through the gas chamber 1 Inside, the rotation of the screw 3 can be controlled from the outside;
[0080] The air chamber 1 has a channel connected to the outside world, which is the first channel 5; the core chamber 2 has three channels connected to the outside world, which are the second channel 6, the third channel 7 and the fourth channel 8;
[0081] The core chamber 2 is provided with a rubber sleeve 10 for wrapping the rock core 11, and the rest of the core chamber 2 outside the rubber sleeve 10 is a core annulus 9 for increasing confining pressure. The rubber sleeve 10 is arranged transversely through, The two ends...
Embodiment 2
[0085] see figure 2 , a device for testing the diffusion coefficient of gas in a core saturated with live oil, characterized in that it includes the high temperature and high pressure diffusion holder 12, and also includes an oil supply device, a gas supply device, a confining pressure control device, and a back pressure control device , pressure acquisition system, vacuum pump 26 and constant temperature control box 29;
[0086] Described gas supply device comprises gas storage tank 13, booster pump 14, gas cylinder 15 and pressure regulating valve 16, and described gas cylinder 15 links to each other with gas storage tank 13 by booster pump 14, and gas storage tank 13 passes pressure regulating valve 16 is connected to the first channel 5 of the gas chamber 1 of the high temperature and high pressure diffusion holder 12, and the gas supply device is used to provide the gas required for the experiment;
[0087] The oil supply device includes a piston container 17, an active...
Embodiment 3
[0094] A method for testing the diffusion coefficient of gas in a core saturated with active oil, the experimental diffusion gas is CO 2 , the dissolved gas is methane (CH 4 ), the methods include: a diffusion test method and a method for testing the diffusion coefficient;
[0095] Wherein said diffusion test method comprises:
[0096] 1) active oil configuration: according to the set 10sm 3 / m 3 Add degassed and dehydrated crude oil and methane into the active oil sampler 18. After the configuration is complete, put it into the piston container 17; take a sample and measure the CO by withdrawing the pump 2 The bubble point pressure in the prepared oil sample is 5.4MPa;
[0097] 2) Analysis of oil sample components: sampling and analysis of crude oil components by gas chromatography;
[0098] 3) Air-tightness inspection: After cleaning and drying the pipeline of the device, check the air-tightness of the device;
[0099] 4) Core 11 treatment: washing and drying the core ...
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