Calculating method for size of fracturing and broken region of horizontal well for shale

A calculation method and technology of fracture zone, which is applied in the direction of mining fluid, earthwork drilling and production, wellbore/well components, etc., can solve the problems of time-consuming, laborious and expensive, and the volume evaluation of fracturing fracture zone cannot be widely popularized and applied.

Active Publication Date: 2015-11-04
SOUTHWEST PETROLEUM UNIV
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  • Claims
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Problems solved by technology

[0005] The present invention provides a volume calculation method for shale horizontal well fracturing fracture zone which solves the problem of time-consuming, labor-intensive and costly calculati

Method used

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  • Calculating method for size of fracturing and broken region of horizontal well for shale
  • Calculating method for size of fracturing and broken region of horizontal well for shale
  • Calculating method for size of fracturing and broken region of horizontal well for shale

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Embodiment 1

[0101] A method for calculating the volume of a fracturing fracture zone in a shale horizontal well, comprising the following steps:

[0102] The geological parameters of a typical shale gas reservoir and the fracturing operation parameters of horizontal wells are known in the following table:

[0103] Table 1 Instance 1 Actual Parameters

[0104]

[0105]

[0106] First, the fracture propagation theory is used to establish the hydraulic fracture propagation model in the shale fracturing process, and the schematic diagram of the model is shown in Fig. figure 2 As shown, in conjunction with the following formula to calculate the extension of three hydraulic fractures in embodiment 1:

[0107] The crack width equation:

[0108] W ( y ) = 2 ( 1 - ν 2 ...

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Abstract

The invention discloses a calculating method for the size of a fracturing and broken region of a horizontal well for shale. The calculating method comprises following steps of: A, utilizing the theory of crack propagation available to establish a hydraulic fracture extension model during a shale fracturing process; B, utilizing the theory of rock mechanics available to establish a model for stress field variation during a shale fracturing process; C, utilizing the theory of seepage mechanics available to establish a model for pressure field variation during a shale fracturing process; D, utilizing the rock breaking theory available to establish a rule model for natural fractures; E, combining the above four steps to calculate and represent the size of the fracturing and broken region by means of a calculation flow. The calculating method for the size of the fracturing and broken region of the horizontal well for shale has following beneficial effects: time and money spent on calculating the size of the broken region during fracture of the horizontal well for shale are saved so that the valuation of the size of the fracturing and broken region can be extensively prompted and applied.

Description

technical field [0001] The invention relates to the field of shale gas development, in particular to a method for calculating the volume of a fracturing fracture zone of a shale horizontal well. Background technique [0002] At present, horizontal well fracture network fracturing technology is a widely used stimulation measure in the development of shale gas reservoirs around the world. This technology can significantly improve the economy and efficiency of shale gas development. The basic feature of volume fracturing is to use large liquid volume, large displacement, large sand volume, small particle size, and low sand ratio for fracturing construction, with the purpose of using artificial fractures to maximize damage, activation, and communication of reservoirs The natural fractures in the wells form a larger volume of the fracture fracture zone, thereby increasing the effective permeability in the area near the horizontal well. [0003] For the pre-design and post-evalua...

Claims

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Application Information

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IPC IPC(8): E21B43/26E21B49/00
Inventor 任岚林然赵金洲黄静
Owner SOUTHWEST PETROLEUM UNIV
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