Bottom Hole Assembly Modeling via Recursive Segmentation
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Solution Overview
Problem
Current BHA modeling techniques face challenges in accurately predicting directional drilling performance due to nonlinear differential equations, unknown boundary conditions, and large deformation issues, leading to inefficiencies and increased costs from premature component failures.
Innovation Solution
The Recursive Modulation Method (RMM) is introduced, which divides the BHA configuration into segments and modules, reducing unknowns to two nonlinear equations solvable by iteration, allowing for dynamic and computationally efficient modeling of BHA configurations, including stabilizers, cross-overs, and bends.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional BHA modeling techniques are used to accurately predict directional drilling performance, then measurement precision is improved, but device complexity and computational requirements increase significantly due to nonlinear differential equations and unknown boundary conditions
Solution Approach 1:
The patent applies segmentation by dividing the BHA configuration into discrete modules (stabilizers, cross-overs, bends, drill bit) arranged in sequential segments. Each module is characterized by specific parameters (stabilizer diameter, bend angle, component lengths) that can be independently defined. This modular segmentation transforms the continuous complex differential equations into discrete algebraic relationships, reducing computational complexity while maintaining prediction accuracy for directional drilling performance.
2Adaptability or versatility
If comprehensive BHA components and configurations are modeled to optimize directional drilling, then adaptability is improved, but manufacturing precision requirements increase due to the need to accurately model stabilizer locations, bends, and cross-overs
Solution Approach 1:
The patent implements universality by creating a multi-functional modeling system that can handle various BHA configurations (different stabilizer arrangements, bend types, cross-over patterns) using a single unified framework. The system accepts diverse input parameters (stabilizer diameters, bend angles, component lengths) and applies consistent computational methods across all configuration types. This universal approach enables adaptable modeling of directional drilling scenarios without requiring precision-critical custom modeling for each specific configuration.
3Productivity
If real-time modeling of BHA configurations is implemented to minimize component failures, then productivity is improved, but use of energy increases due to computational requirements for processing drilling data and adjusting parameters
Solution Approach 1:
The patent applies preliminary action by pre-defining the modular BHA structure with all possible component types (stabilizers, bends, cross-overs) and their parameter ranges before actual drilling operations. The segmentation framework and computational algorithms are prepared in advance, allowing the system to quickly process real-time drilling data by simply updating input parameters rather than performing complete recalculations. This preliminary setup significantly reduces the computational energy required for real-time optimization while maintaining high productivity.
Data Source
AI summary
A method and system for designing bottom hole assembly configuration. The system and method include modeling the bottom hole assembly by dividing complicated BHA configurations into independent modules and segments. Modules are bounded by two stabilizers where segments are bounded by bottom hole assembly components. A recursive process is used to derive solutions for each of the segments and modules. Only two unknowns (and two non-linear equations) are left when the recursive process reaches to the bit. The two unknowns are then solved by iteration.