Calculation method for determining high-pressure physical parameters of foamy oil
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A technology of physical parameters and calculation methods, which is applied in the direction of earthwork drilling, production fluid, wellbore/well components, etc. It can solve the problems of difficult gas dissolution, lack of system calculation method of foam oil high-pressure physical parameters, long stirring time, etc.
Active Publication Date: 2017-06-13
CHINA UNIV OF PETROLEUM (EAST CHINA)
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[0005] ①Because the experimental sample is heavy oil and the gas is difficult to dissolve, a long stirring time is required to prepare the experimental formation sample
However, the applicability of the above formula to special heavy oil (which can produce foam oil phenomenon) needs to be further evaluated, and there is still a lack of a systematic calculation method for calculating the high-pressure physical properties of foam oil in the non-equilibrium state
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Embodiment 1
[0076] A calculation method for determining the high-pressure physical parameters of foam oil, the calculation flow chart is shown in figure 1 As shown, the calculation steps are as follows:
[0077] Step 1. Determine the gas dispersion coefficient α under different resting times according to the ratio of foam oil to dissolved gas to oil at different resting times;
[0078] Step 2. Determine the physical parameters of the special heavy oil under study, including: dissolved gas-oil ratio R at bubble point pressure sb , reservoir temperature T, dead oil density ρ STO ;
[0079] In this example 1, it is determined that the special heavy oil studied is the heavy oil sample 9, and the dissolved gas-oil ratio R at the bubble point pressure is sb 31m 3 / m 3 , reservoir temperature T is 43℃, dead oil density ρ STO 0.998g / cm 3 .
[0080] Step 3. Determine the bubble point pressure p of the special heavy oil b and the time t to achieve equilibrium after oil and gas are complete...
Embodiment 2
[0141] A calculation method for determining the high-pressure physical property parameters of foam oil as described in Example 1, the difference is that the gas dispersion coefficient α of heavy oil sample 1 is calculated by this method. According to the gas-oil ratio of foam oil dissolved in different static times obtained from indoor experiments, the gas dispersion coefficient α is determined at different static times. The calculation method is shown in formula (1):
[0142] α=(x-y) / x (1)
[0143] x is the total volume of dissolved gas in special heavy oil under a certain pressure, m 3 ; y is the volume of dissolved gas in foam oil under non-equilibrium state, m 3 .
[0144] In this embodiment, the gas dispersion coefficient α is calculated according to the formula (1) under different static times, see Figure 4 . Depend on Figure 4It can be seen that, no matter what the static time is, the free gas dispersion coefficient increases first and then decreases with the dec...
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Abstract
A calculation method for determining high-pressure physical parameters of foamy oil is used to characterize the ability of heavy oil to capture gas in reduced pressure production of a foamy oil reservoir and reflect the magnitude of the ability of heavy oil to produce foamy oil. A series of calculation formulas for determining foamy oil dissolved gas-oil ratio, compression coefficient, volume coefficient, density and viscosity in balanced state are formed; high-pressure physical parameters of non-balanced foamy oil under bubble point pressure are determined by establishing function relationship between the high-pressure physical parameters and balance time in balanced state and the high-pressure physical parameters and different static times in non-balanced state; finally, foamy oil dissolved gas-oil ratio, compression coefficient, volume coefficient, density and viscosity under different static times and pressures are determined; therefore, the high-pressure physical parameters of foamy oil in balanced and non-balanced states are determined quickly and accurately. The calculation method according to the invention is significant to the calculation of heavy oil reservoir capacities, the selection of exploiting modes, gathering and transportation design of oil-gas well surface engineering, the formulation of exploitation schemes and the like.
Description
technical field [0001] The invention relates to a calculation method for determining high-pressure physical property parameters of foam oil, belonging to the technical field of heavy oil reservoir development. Background technique [0002] Heavy oil resources are very rich in the world, accounting for more than one-third of the total oil and gas resources. my country's proven and controlled reserves are more than 1.9 billion tons, mainly distributed in more than a dozen oil fields such as Liaohe, Xinjiang, and Shengli. In addition, with the internationalization of my country's oil and gas exploration and development, a large number of foreign heavy oil resources need to be developed urgently. Therefore, at a time when conventional oil and gas exploration and development are becoming more and more difficult and energy conflicts are becoming increasingly prominent, vigorously developing heavy oil resources is in line with the national economic development strategy. [0003] ...
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