Method for evaluating rationality of low-permeability non-homogeneous gas reservoir fracturing horizontal well fracture parameters

Abstract

The invention discloses a method for evaluating the rationality of low-permeability non-homogeneous gas reservoir fracturing horizontal well fracture parameters. The method comprises the steps that the parameters of the reservoir physical property, the fluid property, fracturing horizontal well fractures, a horizontal shaft and the propping agent property are collected; the permeability distribution condition of a non-homogeneous gas reservoir is divided into relatively homogeneous permeable zones in the length direction of the horizontal shaft, and the permeable zones contain artificial fractures; a fracturing fracture physical model of the permeable zones containing the artificial fractures and a mathematical model for fracture parameter evaluating are built; the high-speed non-darcy-flow effective permeability in the factures is corrected; a fracture yield model taking high-speed non-darcy flow of the fractures into account is solved, and an evaluating chart of the non-homogeneous gas reservoir fracturing horizontal well fracture parameters is built; the rationality of the low-permeability non-homogeneous gas reservoir fracturing horizontal well fracture parameters is evaluated. According to the method, the low-permeability gas reservoir heterogeneity characteristics and the comprehensive influence that the high-speed non-darcy-flow exists in the fracturing horizontal well fractures can be taken into account, and therefore the fracture parameters of all sections of a low-permeability non-homogeneous gas reservoir fracturing horizontal well are quickly and efficiently evaluated.

Description

technical field [0001] The application belongs to the field of oil and gas field development, and in particular relates to a method for evaluating the rationality of fracture parameters of a fractured 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. . When evaluating the fractures of fractured 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 evaluation methods of fracturing horizontal wells mainly include electrical simulation experiment method, analyti...

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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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