Device and experimental method for diffusion and oil discharge of carbon dioxide in tight oil reservoir
A carbon dioxide and tight oil technology, applied in the field of tight oil exploration, can solve problems such as complex diffusion and mass transfer mechanism
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Embodiment 1
[0041] The tight oil samples used in the following examples come from the Chang 7 Member formation in the Ordos Basin.
[0042] like figure 1 As shown, in one embodiment of the present invention, a device for carbon dioxide diffusion and oil discharge in tight oil reservoirs includes a control room 4, a gas storage tank 1, an extraction tank 10, and a temperature and pressure controller 12;
[0043] The inside of the control room 4 is equipped with a nuclear magnetic resonance instrument 6, and the nuclear magnetic resonance instrument 6 is provided with a reactor 8 for holding tight oil samples, which is used to detect the T2 spectrum of the tight oil samples; The input end is connected, and the carbon dioxide is delivered to the reactor 8; one end of the temperature and pressure controller 12 is connected with the output end of the gas storage tank 1, and the phase state of the carbon dioxide output by the gas storage tank 1 is adjusted by adjusting its temperature and press...
Embodiment 2
[0050] The experimental method of carrying out the diffusion and oil discharge of tight oil reservoirs by using the device of carbon dioxide diffusion oil discharge in the tight oil reservoirs of Example 1 comprises the following steps:
[0051] 1) Take a tight oil sample, then put it into the reaction kettle and measure the length 4.2cm, diameter 2.5cm, initial mass M of the tight oil sample 1 =65.8g and initial NMR T2 spectrum (as figure 2 shown);
[0052] 2) Close the first pressure reducing valve and the second pressure reducing valve, open the switch of the storage tank, the gas booster pump and the temperature and pressure controller; by setting the temperature of the temperature and pressure controller At 60°C and a pressure of 14MPa, supercritical carbon dioxide is obtained as a medium for the diffusion and oil discharge of the reactor;
[0053] 3) Open the first pressure reducing valve and the second pressure reducing valve, the carbon dioxide enters the reactor, a...
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