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An analysis method for influencing factors of complex fracture propagation in shale fracturing process

A technology of influencing factors and analysis methods, which is applied in earthwork drilling, wellbore/well components, instruments, etc., can solve the problem that the fracturing effect and quality cannot be effectively guaranteed, complex fracture extension rules and influencing factors are not clear enough, hydraulic pressure Difficulty in fracture design and post-fracture evaluation

Active Publication Date: 2021-09-14
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

The fracture mode in the fracturing process is no longer a single double-wing fracture system formed by conventional fracturing, and the extension law of the fracture system has become more complicated. However, the current judgment of fracturing shape is still based on the formation of double-wing fractures in conventional reservoirs. Typical charts lead to unclear extension rules and influencing factors for the formation of complex fractures. The expansion pattern of complex fracture networks cannot be correctly judged, and the fracturing effect and quality cannot be effectively guaranteed. difficulty

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  • An analysis method for influencing factors of complex fracture propagation in shale fracturing process
  • An analysis method for influencing factors of complex fracture propagation in shale fracturing process
  • An analysis method for influencing factors of complex fracture propagation in shale fracturing process

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[0465] Well Jiaoye 48-1HF is located in the Jiaoshiba anticline of the Jiaoshiba block in Fuling. It is a horizontal shale gas development well deployed for the shale gas layer in the lower part of the Upper Ordovician Wufeng Formation and the Lower Silurian Longmaxi Formation. , we applied the research results to make a preliminary diagnosis of the fracturing curves of the first 5 stages of construction. The fracturing curves of the 1st to 3rd stages are mainly pressure-climbing type, and the pressure fluctuates greatly during the sanding process, resulting in limited sanding. From the micro-seismic monitoring results, the number of event points in the early stage was relatively small, the fractures did not extend smoothly, and the overall reconstruction volume was relatively small. In the later stage, a complex fracture network system was formed in the near-wellbore area. In this example, the construction curve of the second end is taken as Example to illustrate, as shown in ...

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Abstract

The invention discloses an analysis method for influencing factors of complex fracture expansion in the shale fracturing process, which includes the following steps: firstly, analyzing the geological characteristics of the target reservoir; The corresponding solution method calculates the net pressure of different expansion modes, and inverts the fracture parameters under different expansion modes; finally, the fracture extension law and the corresponding pressure under various factors that affect the dynamic expansion of shale fractures Response characteristics were studied to clarify the crack dynamic expansion law and main controlling factors under different construction pressure responses. The present invention can clearly grasp the dynamic expansion behavior of fractures, realize the diagnosis and analysis of different typical construction curves in shale gas fields, and is beneficial to identify various fracturing change events as early as possible, judge the fracture shape trend and construction abnormal points in advance, and adjust fracturing optimization in time Design, avoid ineffective transformation, reduce the cost of measures, thereby improving the quality and effect of fracturing.

Description

technical field [0001] The invention is applied to the field of petroleum and natural gas engineering, and in particular relates to an analysis method for the influencing factors of complex crack expansion in a shale fracturing process. Background technique [0002] The ultra-low porosity and permeability characteristics of shale reservoirs determine that in order to obtain high-yield industrial gas flow through fracturing stimulation, complex fractures that are different from conventional reservoirs must be formed, which maximizes the volume and complexity of fracture stimulation, and ultimately achieves the optimization of single-well productivity. The fracture mode during the fracturing process is no longer a single double-winged slot system formed by conventional fracturing, and the extension law of the fracture system has become more complex, but the current judgment of the fracturing form is still based on the formation of double-winged slot in conventional reservoirs. ...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F30/20E21B43/26G06F119/14
CPCE21B43/26G06F2119/06G06F30/20
Inventor 朱志芳陈建达杨溢张辉刘湘肖佳林黄晓凯李奎东王小军王升刘炜熊力坤刘龙王炯易招波胡韵王倩雯
Owner CHINA PETROLEUM & CHEM CORP
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