Calculation method of gas transport flow rate in nanoscale pores of shale
A calculation method and a technology for transmitting traffic, applied in calculation, computer-aided design, design optimization/simulation, etc., can solve problems that cannot be described
Active Publication Date: 2020-05-05
SOUTHWEST PETROLEUM UNIV
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Problems solved by technology
However, because shale gas has multiple transport modes in micro-nano pores, and different transport modes will transform each other, the existing technology cannot describe the processes and transformations in the multiple transport modes conveniently and accurately.
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[0136] The first step is to collect reservoir temperature, reservoir pressure, pore size and gas-related parameters. The collection results are shown in the following table:
[0137] Table 1 Reservoir and experimental gas related parameters
[0138]
[0139] Note: The data with * is the data required to calculate the surface diffusion item, and C is taken when calculating the contribution coefficient ε A = 0,K nviscous =0.3, S=1.
[0140] The second step, such as figure 1 and figure 2 As shown, the relevant parameters in Table 1 are substituted into the formulas (31)-(34) to calculate the gas transmission ratio of each transmission mode when the gas flows in the micropores.
[0141] Depend on figure 1 and figure 2 It can be seen that under the condition of micropores, due to the smaller diameter of nanopores and larger specific surface area, the content of adsorbed gas is higher at this time, and the transport mechanism of adsorbed gas is stronger; because of the sm...
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The invention belongs to the technical field of shale gas development and specifically relates to a method for computing a gas transmission flow quantity in shale nano-scale pores. The method comprises the steps that (A) reservoir temperatures, pore sizes and related gas parameters are collected; (B) reservoir gas flow states are judged; (C) according to the reservoir gas flow states, corresponding gas mass transmission equations are established; (D) a mass transmission uniform equation of the reservoir gas under the different flow states is established; and (E) proportions occupied by gas transmission flow quantities in the nano-scale pores under different transmission mechanisms in the total transmission flow quantity are computed. According to the invention, the characteristic that shale gas mainly reserves at a free state and an adsorbed state is fully considered; the gas mass transmission uniform equation under multiple scales and the multiple flow states is established; the mass transmission uniform equation can be used to compute the gas transmission flow quantities of the gas in the nano-scale pores under different transmission modes; and according to the proportions of the gas transmission flow quantities in the total gas transmission flow quantity, transmission mechanisms of the gas in the nano-scale pores can be researched.
Description
technical field [0001] The invention relates to a calculation method for gas transmission flow rate in shale nanoscale pores, and belongs to the technical field of shale gas development. Background technique [0002] Compared with conventional natural gas reservoirs, shale gas exhibits the characteristics of multiple storage modes and multiple transmission modes in shale reservoirs: ① There are various storage modes, because shale gas reservoirs have the characteristics of self-generation and self-storage , in addition to the free gas in the pores and fractures, there is also a large amount of adsorbed gas on the nano-micro pore walls, and some shale gas is dissolved in kerogen and water; ②Shale gas in shale reservoirs The transmission of shale gas shows multi-scale. First, the shale gas reservoir and seepage space includes organic matter nano-pores, micro-pores, reservoir natural micro-fractures and multi-scale complex fracture network formed by fracturing. Shale gas in the...
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IPC IPC(8): G06F30/28G06F113/08G06F119/14
CPCG16Z99/00
Inventor 曾凡辉程小昭郭建春龙川
Owner SOUTHWEST PETROLEUM UNIV