A Calculation Method of Permeability of Complex Fracture Network
A technology of fracture permeability and network permeability, applied in the field of unconventional oil and gas development, it can solve the problems of not reflecting the reservoir conditions and considering both tension and shear fractures.
Active Publication Date: 2019-10-22
SOUTHWEST PETROLEUM UNIV
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Problems solved by technology
Similarly, when calculating the permeability of a complex fracture network, there are currently shortcomings that cannot reflect the real reservoir conditions, and cannot simultaneously consider factors such as tension, shear fractures, and confining pressure.
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[0106] Such as Figure 2-4 As shown, three rock cores are selected, and the cores are first scanned by CT, and the scanned images are processed in gray scale to identify the distribution position and morphological characteristics of cracks on the rock surface, and the crack length, crack density and fractal obtained according to the model of the present invention Dimension and other parameters to establish a two-dimensional discrete fracture network. The parameters such as fractal dimension obtained according to the scanning results are shown in Table 1.
[0107] Table 1 Calculation basic parameters Ⅰ
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[0109] In order to further illustrate the applicability of the method of the present invention, a sensitivity analysis was further performed using the data in Table 2.
[0110] Table 2 Calculation basic parameters Ⅱ
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[0113] Note: *Experimental test data
[0114] Such as Figure 5 As shown, the permeability in the x direction is obtained...
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The invention belongs to the technical field of non-conventional oil and gas development, and particularly relates to a complex fracture network permeability calculation method. The complex fracture network permeability calculation method comprises the following steps that S1, a rock core is drilled from a shale reservoir section, and the drilled rock core is manufactured into a standard rock corewith the diameter being 2.5 cm and the length being 5.0 cm; S2, the end face of the rock core is subjected to CT scanning, a scanned image is subjected to grey processing, and thus the number, position and morphological features of fractures are identified; S3, based on the image in the S2, the fractal dimension for representing the rock complex fracture network is obtained by using a box method;S4, based on the fractal dimension in the S3, a two-dimensional discrete fracture network model is generated by utilizing a Monte Carlo stochastic modeling theory; and S5, based on the two-dimensional discrete fracture network model, the permeability of the complex fracture network is calculated through an improved cubic law. The complex fracture network permeability calculation method has the beneficial effects that the fractal dimension is obtained through scanning, Monte Carlo stochastic modeling is utilized, the actual factors of a formation are considered, the permeability of the complexfracture network is calculated, and the calculated result is closer to the real condition of a reservoir.
Description
technical field [0001] The invention relates to a method for calculating the permeability of a complex fracture network, which belongs to the technical field of unconventional oil and gas development. Background technique [0002] With the rapid economic development in the 21st century, the demand for energy continues to rise, and the consumption of traditional energy such as coal, oil, and natural gas is also gradually increasing, and the energy pressure is increasing day by day. In the new situation of energy demand, as an effective supplement to conventional oil and gas energy, shale gas has entered people's field of vision in the form of unconventional natural gas. In recent years, shale gas has attracted much attention due to its huge resource potential and economic value. With the development of horizontal well drilling technology and volume fracturing technology, it has increasingly become an important field and target of oil and gas resource exploration and developme...
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IPC IPC(8): E21B49/00
Inventor 曾凡辉彭凡郭建春王晨星向建华韩慧芬
Owner SOUTHWEST PETROLEUM UNIV