Method for calculating hydraulic fracturing inclined crack induced stress of shale reservoir

A technology for hydraulic fracturing and shale reservoirs, applied in the directions of calculation, special data processing applications, instruments, etc., can solve the problem of inability to determine the stress reversal zone induced by hydraulic fracturing inclined fractures in shale reservoirs, etc.

Active Publication Date: 2016-05-04
SOUTHWEST PETROLEUM UNIV
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Problems solved by technology

[0003] In view of this, the technical problem to be solved in this application is that the prior art cannot determine the induced stress inversion zone of hydraulically fractured inclined fractures in shale reservoirs

Method used

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  • Method for calculating hydraulic fracturing inclined crack induced stress of shale reservoir
  • Method for calculating hydraulic fracturing inclined crack induced stress of shale reservoir
  • Method for calculating hydraulic fracturing inclined crack induced stress of shale reservoir

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Embodiment

[0135] In this embodiment, the method for calculating the induced stress of inclined fractures by hydraulic fracturing in shale reservoirs is applied, and the details are as follows:

[0136] The basic parameters of in-situ stress and inclined fractures of the shale reservoir are as follows:

[0137] Table 1 Basic Physical Parameters

[0138]

[0139] Such as image 3 As shown, the σ x The change of induced stress value along the direction of fracture width x. It can be seen that as the distance from the fracture center increases, σ x The value shows an overall downward trend. When the fracture dip angle is 30°, σ x The induced stress value first decreases sharply to a negative value, and then gradually increases to zero; when the fracture inclination angle is 60° and 90°, σ x The induced stress value gradually decreases until it tends to zero, and the range of the curve changes from sharp to gentle. σ from different fracture dip angles x From the comparison of the ...

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Abstract

The application discloses a method for calculating a hydraulic fracturing inclined crack induced stress of a shale reservoir. The method comprises the following steps of: 1, collecting basic parameters of the shale reservoir and a hydraulic crack; 2, establishing a calculation model of the hydraulic fracturing inclined crack induced stress of the shale reservoir; and 3, calculating the hydraulic fracturing inclined crack induced stress of the shale reservoir, and by analyzing change rules of the inclined crack induced stress in an x crack width direction and a z crack length direction, determining a stress inverted region. According to the method disclosed by the application, aiming at the inclined crack induced stress formed in the horizontal well fracturing process of the shale reservoir, simulation is carried out, and an induced stress field distribution condition under the inclined crack is analyzed, so that guidance is provided for optimization of a hydraulic crack position where the complex crack is formed by a fracturing horizontal well of the shale reservoir, and a fracturing effect of the shale gas reservoir is 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 calculating the induced stress of oblique fractures in hydraulic fracturing of shale reservoirs. Background technique [0002] The reservoirs of shale gas reservoirs are generally characterized by low porosity and low permeability, and the resistance to gas flow is greater than that of conventional natural gas. All wells need to be hydraulically fractured to be recovered. The strong heterogeneity of shale reservoirs and the characteristics of low permeability reservoirs require a sufficiently large volume of stimulation in the fracturing state in order to obtain high production. When the reservoir itself is not capable of forming complex fractures through fracturing, the induced stress field generated by hydraulic fracturing fractures can promote the formation of volumetric fractures. At present, researchers have carried out extensive resea...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
CPCG06F30/367
Inventor 曾凡辉郭建春李超凡
Owner SOUTHWEST PETROLEUM UNIV
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