Personalized Drill Bit Design for Complex Formations
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Solution Overview
Problem
Conventional drill bit designs for complex difficult-to-drill formations, such as deep and ultra-deep wells with high temperature, high pressure, and varying rock properties, are inefficient due to neglecting the influences of drill string vibrations and changing rock properties, leading to short drill bit life and low drilling speed.
Innovation Solution
A dynamic design method for a personalized drill bit that simulates high temperature and pressure environments, performs rock mechanics testing, and establishes a coupled integrated dynamics model of the drill string-drill bit-rock system, incorporating different tooth shapes and distributions, and optimizing manufacturing processes to enhance rock breaking efficiency and durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional drill bit design methods are used, then the design process is simple, but the drill bit life and drilling efficiency are poor in complex difficult-to-drill formations
Solution Approach 1:
The patent applies dynamics by transitioning from static drill bit design to dynamic design that accounts for time-varying drill string vibrations and changing rock properties during drilling. The coupled integrated dynamics model simulates the actual dynamic working conditions, allowing the drill bit design to adapt to varying operational states and improve drilling efficiency in complex formations.
Solution Approach 2:
The patent utilizes parameter changes by varying tooth shape parameters (conical, spherical, wedged), tooth distribution patterns (unequally-spaced, twisted, spiral), and structural parameters based on the coupled dynamics model simulation results. These parameter optimizations are tailored to specific formation characteristics, enabling enhanced rock breaking efficiency and extended drill bit life.
2Adaptability or versatility
If single-factor design methods are used, then the design process is simple, but the drill bit cannot adapt to changing rock properties and vibrations
Solution Approach 1:
The patent applies local quality by designing different tooth shapes (conical, spherical, wedged) and varying tooth distribution patterns for different regions of the drill bit. Each local region is optimized for specific rock breaking functions based on the simulated rock properties and vibration characteristics at that location, enhancing overall adaptability to changing formation conditions.
Solution Approach 2:
The patent implements dynamics by incorporating time-varying vibration parameters and changing rock properties into the design process. The coupled integrated dynamics model captures the dynamic interaction between drill string, drill bit, and formation, enabling the drill bit design to adapt to evolving operational conditions rather than relying on static single-factor approaches.
3Reliability
If drill string vibrations are not considered, then the design is simpler, but the drill bit reliability and rock breaking efficiency are reduced
Solution Approach 1:
The patent applies dynamics by explicitly incorporating drill string vibrations (longitudinal, lateral, and torsional) into the design model. The coupled integrated dynamics model simulates the dynamic interaction between vibrations and rock breaking, leading to more reliable drill bit designs that account for actual operational conditions rather than idealized static scenarios.
Solution Approach 2:
The patent applies preliminary action by performing comprehensive simulation and analysis of drill string vibrations and rock properties before finalizing the drill bit design. The coupled dynamics model predicts vibration patterns and rock breaking behavior in advance, allowing designers to optimize tooth configuration and structure to mitigate harmful vibrations and improve reliability before manufacturing.
4Productivity
If static strength analysis only is used, then the analysis is simpler, but the influence of vibrations and lithology changes on drill bit performance is neglected
Solution Approach 1:
The patent transitions from static strength analysis to dynamic analysis by incorporating time-varying vibrations and changing rock properties. The coupled integrated dynamics model simulates the dynamic rock breaking process, capturing the interaction between drill string vibrations, tooth-rock contact forces, and formation characteristics, thereby improving mechanical drilling speed predictions and overall productivity.
Solution Approach 2:
The patent applies feedback by using the simulation results from the coupled dynamics model to iteratively optimize tooth shape, distribution, and structural parameters. The model provides feedback on rock breaking efficiency and vibration effects, allowing designers to refine the drill bit configuration to maximize mechanical drilling speed while accounting for complex formation conditions.
Data Source
AI summary
A design method for a personalized drill bit for a complex difficult-to-drill formation includes: S1, acquiring rock drillability indexes of a drilled formation; S2, performing digital simulation analysis of rock breaking of bit teeth and a composite rock breaking experiment of a ring gear and a drill bit, and establishing a mechanical model of the rock interaction at the bottom of a well; S3, establishing an integrated dynamics model of drill string-drill bit-rock system coupling; S4, designing a tooth shape, a tooth distribution density, a crown shape and a gauge protection structure for rock mechanics properties of a complex difficult-to-drill formation; S5, optimizing bit nozzle and hydraulic structure parameters by using the computational fluid dynamics theory and the numerical simulation method; S6. optimizing a manufacturing process of the drill bit by using the tooth material decarburization strengthening technology, the high-strength bit body material technology and the special tooth-shaped tooth technology.