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Test method for researching hydraulic fracturing complex fracture network micro-fracture interaction mechanism

A technology of hydraulic fracturing and test method, which is applied in earth-moving drilling, wellbore/well components, and production fluids, etc., can solve the problem of less research on interaction mechanism, and achieve the goal of optimizing construction parameters, increasing production, and increasing complexity. Effect

Active Publication Date: 2021-02-09
WUHAN UNIV
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Problems solved by technology

There are relatively few studies on the mechanism of this interaction

Method used

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  • Test method for researching hydraulic fracturing complex fracture network micro-fracture interaction mechanism
  • Test method for researching hydraulic fracturing complex fracture network micro-fracture interaction mechanism
  • Test method for researching hydraulic fracturing complex fracture network micro-fracture interaction mechanism

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Embodiment Construction

[0026] The technical solution of the present invention will be further described in detail below in conjunction with specific embodiments and accompanying drawings.

[0027] The present invention is a test method for studying the interaction mechanism of micro-cracks in complex fracture networks of hydraulic fracturing, and the specific steps are as follows;

[0028] 1) Drilling and setting different perforation spacing. Such as image 3 shown.

[0029] 2) Water injection fracturing requires high water pressure and low flow rate (to ensure crack initiation) into the hole.

[0030] Different fracturing methods are used: perforation and fracturing at the same time, one perforation is fracturing and then the other is fracturing. The test sequence is simple first and then complex. After proving the influence of perforation distributed fracturing fracture initiation and micro-fracture interaction after the expansion process, the perforation simultaneous fracturing test is carrie...

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Abstract

The invention discloses a test method for researching a hydraulic fracturing complex fracture network micro-fracture interaction mechanism. According to the research method, shale is taken as a test research object, small-size perforations are formed in a shale sample, a hydraulic fracturing tip micro-fracture is constructed, and by means of a CT real-time scanning technology, a growth mode of a hydraulic fracturing micro-fracture network changing along with time under different confining pressure conditions is obtained, and the interaction mechanism between micro-fractures and the influence of fracture spacing, construction displacement, fracturing fluid viscosity and the like on the action between the fracture network micro-fractures. The research method has important theoretical value and economic value for analyzing key factors influencing hydraulic fracturing micro-fracture extension and penetration, revealing the complex fracture network micro-fracture interaction mechanism and designing actual production fracturing parameters.

Description

technical field [0001] The invention relates to the technical field of engineering construction, in particular to a test method for studying the interaction mechanism of micro-cracks in complex fracture networks of hydraulic fracturing. Background technique [0002] Shale gas reservoirs are characterized by low porosity and low permeability, and usually have no natural production capacity. Large-scale overall block fracturing is required for efficient utilization and development. Different shale gas reservoirs have different development degrees of micro-fractures, brittle minerals and clay contents, which lead to great differences in compressibility. Shale gas fracturing uses low-viscosity drag-reducing water to increase fluid loss, communicate as many natural fractures as possible, and form a complex fracture network structure in the reservoir. The more complex the fracture, the larger the stimulated reservoir volume (SRV) and the higher the productivity of the fractured w...

Claims

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Application Information

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IPC IPC(8): E21B49/00E21B43/26
CPCE21B49/00E21B43/26
Inventor 张晓平张旗孙伟
Owner WUHAN UNIV
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