Method of determining fractured horizontal well crack parameters of low-permeability anisotropic gas reservoir

Abstract

The invention discloses a method of determining fractured horizontal well crack parameters of a low-permeability anisotropic gas reservoir. The method comprises the steps of collecting parameters of reservoir physical properties, fluid properties, a horizontal shaft and proppant properties; dividing the anisotropic gas reservoir into at least two homogeneous vadose zones in the length direction of the horizontal shaft according to transverse permeability distribution, wherein the vadose zones contain artificial cracks; establishing a fractured crack physical model for the vadose zones containing the artificial cracks and a mathematic model for crack parameter evaluation; correcting effective permeability of high-speed non-darcy flow in the cracks; solving a crack yield model considering the high-speed non-darcy flow in the cracks and establishing an evaluation chart for the fractured horizontal well crack parameters of the anisotropic gas reservoir; determining the fractured horizontal well crack parameters of the low-permeability anisotropic gas reservoir. According to the method, comprehensive influences of the anisotropic characteristic of the low-permeability gas reservoir and the high-speed non-darcy flow existing in the fractured horizontal well cracks can be considered, and quick and efficient determination of the parameters of all the cracks of a fractured horizontal well of the low-permeability anisotropic gas reservoir and the proppant size is achieved.

Description

technical field [0001] The application belongs to the field of oil and gas field development, and in particular relates to a method for determining fracture parameters of a fracturing horizontal well in a low-permeability heterogeneous gas reservoir. Background technique [0002] Low-permeability gas reservoirs are characterized by lateral heterogeneity of reservoir permeability plane, and the production can be significantly increased by staged fracturing of horizontal wells in low-permeability gas reservoirs. At this time, high-speed non-Darcy flow characteristics are displayed in the fractures. . In the optimal design of fracture parameters for fracturing horizontal wells in low-permeability gas reservoirs, the effects of permeability heterogeneity and high-speed non-Darcy flow in fractures must be considered comprehensively. At present, the fracture parameter design methods of fracturing horizontal wells mainly include electrical simulation experiment method, analytical-...

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Problems solved by technology

[0003] The electrical simulation method and the analytical-semi-analytic method mainly take the average value of the permeability through the weighted average method of reservoir permeability, that is, the reservoir is regarded as homogeneous, and the lateral heterogeneity characteristics of the reservoir plane are not considered; the numerical simulation method The lateral heterogeneity of the reservoir can be considered, but the high-speed non-Darcy flow characteristics in the fracture cannot be considered, and when using this method, a large amount of reservoir data is required, and the calculation speed is relatively slow

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