Method for optimizing fracture position of ultra-low permeability heterogeneous gas reservoir fractured horizontal well

Abstract

The invention discloses a method for optimizing the fracture position of an ultra-low permeability heterogeneous gas reservoir fractured horizontal well. The method mainly comprises the following steps that basic parameters of a reservoir stratum, fluid and a horizontal well shaft are collected; a heterogeneous gas reservoir is partitioned into at least to vadose zones in the length direction of the horizontal well shaft, wherein artificial fractures are contained in the vadose zones; a vadose unit simulation model of each vadose zone is established; vadose simulation models of at least two vadose units are established; the vadose simulation models of all the vadose units are coupled, and the yields of the heterogeneous gas reservoir fractured horizontal well are calculated; the yields are compared, and the fracture position where the ultra-low permeability heterogeneous gas reservoir fractured horizontal well has the highest yield is selected. According to the technical scheme, the influences of reservoir stratum heterogeneity and the starting pressure gradient are fully considered, the defect that in the prior art, only the fracture position of a homogeneous gas reservoir fractured horizontal well without the consideration of the starting pressure can be selected is overcome, and thus the effectiveness and the effect of transformation of the ultra-low permeability heterogeneous gas reservoir fractured horizontal well are improved.

Description

technical field [0001] The application belongs to the field of oil and gas field development, and in particular relates to a method for optimizing the fracture position of a fractured horizontal well in an ultra-low permeability heterogeneous gas reservoir. Background technique [0002] Ultra-low permeability gas reservoirs are prominently characterized by plane heterogeneity of reservoir permeability and the presence of threshold pressure gradients, and staged fracturing of horizontal wells in heterogeneous gas reservoirs can significantly increase production. When selecting the fracture location of a fractured horizontal well in an ultra-low permeability gas reservoir, the influence of factors such as permeability heterogeneity and threshold pressure gradient must be considered comprehensively. At present, there are mainly methods such as electrical simulation, conformal transformation, superposition principle, and complex variable function theory for the production predic...

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Problems solved by technology

[0003] None of the above methods considered the combined effects of the heterogeneity of ultra-low permeability gas reservoirs and the presence of threshold pressure gradients during fluid flow in ultra-low permeability gas reservoirs.

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