Method and device for determining minimum miscibility pressure of oil and gas
A technology of miscible pressure and determination method, applied in measuring devices, measuring fluid pressure, instruments, etc., can solve the problems of poor calculation stability, large difference in initial value, and change of minimum miscible pressure of oil and gas, and achieves strong theory and improved accuracy. , the effect of improving convergence and stability
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Embodiment 1
[0101] Step a, determine the basic characteristic parameter value, as follows:
[0102] A simulated oil system, temperature T = 344K, injected gas is CO 2 and CH 4 Mix gas in equal proportions, set the pore radius R p = 1 μm.
[0103] The simulated oil components and their properties are shown in Table 1:
[0104] Table 1 Crude oil components and component properties
[0105] components z i
T c / K
P c / MPa
ω MW x i
CO 2
0 304.21 7.384 0.2250 44.010 82.00 CH 4
0.25 190.58 4.604 0.0104 16.043 74.05 n-C 4 h 10
0.50 425.18 3.797 0.2010 58.123 193.90 n-C 10 h 22
0.25 617.65 2.115 0.4900 142.290 440.69
[0106] The interaction coefficients among the components are shown in Table 2:
[0107] Table 2 Interaction coefficients of crude oil components
[0108] components CO 2
CH 4
n-C 4 h 10
n-C 10 h 22
CO 2
0.0000 0.1000 0.1257 ...
Embodiment 2
[0119] Step a, according to the actual situation of the target reservoir, determine each parameter value, as follows:
[0120] In a shale reservoir, the temperature T=388.7K, and the pore radius is mostly about 50nm, set R p = 50nm.
[0121] Crude oil components and component properties are shown in Table 5:
[0122] Table 5 Crude oil components and component properties
[0123] components z i
P c / MPa
T c / K
MW Ω x i
CO 2
0.0 72.80 304.20 44.01 0.2250 78.0 CH 4
0.2506 45.40 190.60 16.04 0.0080 77.0 C 2 -C 4
0.22 42.54 363.30 42.82 0.1432 145.2 C 5 -C 7
0.20 33.76 511.56 83.74 0.2474 250.0 C 8 -C 9
0.13 30.91 579.34 105.91 0.2861 306.0 C 10+
0.1994 21.58 788.74 200.00 0.6869 686.3
[0124] The interaction coefficients among the components are shown in Table 6:
[0125] Table 6 Interaction coefficients between components of crude oil
[0126]...
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