Casing Pipe Deformation Pre-warning via Microseismic B-value Analysis
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Solution Overview
Problem
Current methods for pre-warning casing pipe deformation during hydraulic fracturing in shale gas exploitation rely on manual observation of microseismic data, leading to uncertainty and subjective errors in determining fault activation, lacking a reliable discrimination standard.
Innovation Solution
A method that calculates the b-value of hydraulic fracturing induced microseismicity across multiple sub-well intervals to identify continuous change features, allowing for accurate fault activation information and pre-warning of casing pipe deformation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If manual observation of microseismic data is used for pre-warning casing pipe deformation, then the method is simple to operate, but the measurement precision and reliability are insufficient due to subjective errors and lack of discrimination standard
Solution Approach 1:
The patent transforms manual observation of microseismic data into automated parameter analysis by calculating the b-value (a quantitative parameter) from microseismic event frequency and magnitude distributions. This parameter change enables objective, precise identification of fault activation patterns without subjective judgment, resolving the contradiction between operational simplicity and measurement precision.
Solution Approach 2:
The patent replaces the mechanical/manual observation system with an automated computational system that processes microseismic data through mathematical calculations (b-value computation). This substitution eliminates human subjectivity and provides consistent, precise measurements while maintaining ease of operation through automated data processing.
2Device complexity
If manual observation of microseismic data is used to identify fault activation, then the device complexity is low, but the reliability is insufficient due to uncertainty in determining fault activation
Solution Approach 1:
The patent introduces the b-value as a new quantitative parameter that objectively characterizes fault activation patterns. By transforming subjective manual observation into objective parameter calculation, the system achieves high reliability in fault activation identification without requiring complex equipment, thus resolving the contradiction between device complexity and reliability.
Solution Approach 2:
The patent establishes a feedback mechanism where calculated b-values are continuously monitored during fracturing operations. When b-value changes indicate fault activation, the system provides feedback to alert operators, enabling reliable real-time detection without complex additional equipment, thus balancing device complexity with reliability.
3Measurement precision
If b-value calculation is performed across multiple fracturing intervals, then the measurement precision for fault activation identification is improved, but the device complexity and calculation workload increase
Solution Approach 1:
The patent divides the horizontal well interval into multiple fracturing intervals (segments) and calculates b-values for each interval separately. This segmentation enables precise localization of fault activation patterns along the well trajectory, improving measurement precision while maintaining manageable complexity through systematic interval-based processing.
Solution Approach 2:
The patent adds the spatial dimension of fracturing intervals to the b-value analysis, transforming a single-point measurement into a distributed multi-point analysis along the well interval. This dimensional expansion enables precise identification of fault activation locations without proportionally increasing device complexity, as the analysis leverages existing microseismic monitoring infrastructure.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach enables more accurate capture and pre-warning of casing pipe deformation, reducing the likelihood of deformation and improving shale gas exploitation efficiency by objectively identifying fault activation through b-value analysis.
Implementation Method 1
calculating the b-value of the microseismicity in the fracturing stage according to a Gutenberg-Richter relation in seismology
Data Source
AI summary
The present disclosure relates to a method for pre-warning deformation of a casing pipe according to a change feature of the b-value of the hydraulic fracturing induced microseismicity. Based on number distribution and seismic magnitudes of hydraulic fracturing induced microseismic monitoring events, a b-value of microseismicity in a fracturing stage is calculated according to a Gutenberg-Richter relation describing frequency-seismic magnitude distribution in seismology, and whether fault activation occurs in a fracturing process is identified according to a change feature of the b-value. According to the method, a cumulative effect of fault activation in the hydraulic fracturing process is considered, and symptoms of fault activation in the fracturing process can be accurately identified, so as to pre-warn deformation of the casing pipe.