Downhole Adjustable Drill Bit with Dynamic Gauge Pads
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Solution Overview
Problem
Conventional wellbore drilling requires frequent bit changes to accommodate different sections of a wellbore, leading to increased costs and rig time due to the need for optimized drill bit designs for vertical, curved, and lateral drilling, which limits the ability to perform monobore drilling in a single run.
Innovation Solution
A drill bit design that allows for dynamic adjustment of gauge pad diameter and axial position, as well as active cutter diameter and position, using a single actuator and movable cutters and gauge pads, enabling real-time modification of side-cutting efficiency and steerability to optimize stability and steerability for different wellbore sections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If drill bits are optimized for specific wellbore portions (vertical, curved, or lateral), then drilling performance for that specific portion is improved, but the drill bit cannot be used for other portions requiring different configurations
Solution Approach 1:
The drill bit incorporates movable cutters and gauge pads that can be dynamically adjusted between retracted and extended positions using actuators. This dynamic configuration allows the same drill bit to optimize performance for different wellbore portions by changing its geometry in real-time, resolving the contradiction between specialized performance and versatility
Solution Approach 2:
The patent changes physical parameters of the drill bit (cutter position, gauge pad diameter, active cutter diameter) based on drilling requirements. By adjusting these parameters, the drill bit can transition between configurations optimized for vertical, curved, or lateral drilling, maintaining high productivity across different wellbore sections
2Productivity
If drill bits are changed frequently to match different wellbore sections, then optimal drilling performance is maintained, but rig time and operational costs increase
Solution Approach 1:
The drill bit is designed as a universal tool that can perform multiple functions by adjusting its configuration. A single drill bit with adjustable cutters and gauge pads can drill vertical, curved, and lateral wellbore sections, eliminating the need for frequent bit changes and reducing rig time while maintaining optimal performance for each section
Solution Approach 2:
The drill bit is pre-equipped with multiple cutters and gauge pads that can be activated in advance for different drilling sections. This preliminary preparation allows the drill bit to adapt to upcoming wellbore portions without requiring trip-outs, saving time and maintaining continuous drilling operations
3Stability of the object's composition
If gauge pads are extended radially outward to increase stability for straight wellbore drilling, then drill bit stability is improved, but steerability for curved portions decreases
Solution Approach 1:
The gauge pads are designed to be dynamically adjustable between retracted and extended positions. When extended, they provide stability for straight wellbore drilling; when retracted, they allow the drill bit to achieve the necessary steerability for curved portions. This dynamic adjustment resolves the contradiction between stability and steerability
Solution Approach 2:
The drill bit incorporates multiple independent gauge pads that can be adjusted individually or in groups. This segmentation allows selective extension of specific gauge pads to provide stability where needed while keeping other pads retracted to maintain steerability, balancing both requirements
4Adaptability or versatility
If active side cutters are increased for curved wellbore portions to improve steerability, then steerability is enhanced, but drill bit walk and instability increase
Solution Approach 1:
The side cutters are designed as movable components that can be extended or retracted based on drilling section requirements. For curved portions, cutters are extended to enhance steerability; for straight portions, they are retracted to minimize drill bit walk and maintain stability. This dynamic control resolves the contradiction between steerability and stability
Data Source
AI summary
A drill bit includes a bit head defining a longitudinal axis, an adjustable cutter blade having a cutting element, and a blade ramp extending transversely relative to the longitudinal axis and arranged to radially adjust the adjustable cutter blade when the adjustable cutter blade moves axially along a side of the bit head. The drill bit further includes a gauge pad coupled to the adjustable cutter blade and a gauge pad ramp extending transversely relative to the longitudinal axis and arranged to radially adjust the gauge pad when the gauge pad moves axially along the side of the bit head.