Actuatable Cutting Elements and Hydraulic Fracturing for Hard Rock Boring
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Solution Overview
Problem
Conventional earth-boring tools face challenges in efficiently initiating and propagating cracks in underground formations, which limits their ability to effectively remove hard rock layers and increases wear on cutting elements.
Innovation Solution
The introduction of selectively actuatable cutting elements and hydraulic fracturing devices that can transition between active and inactive states, allowing for controlled gouging or crushing actions and fluid injection to initiate or propagate cracks in the earth formation, thereby facilitating more efficient rock removal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional fixed-cutter earth-boring tools are used, then the tool structure is simple and reliable, but the rate of penetration is low and cutting elements wear quickly when encountering hard rock layers
Solution Approach 1:
The cutting elements are designed to be selectively actuatable between extended and retracted positions, transforming the static fixed-cutter design into a dynamic system. This allows the tool to adapt its cutting action based on formation hardness, extending into hard layers for crushing/gouging and retracting for shearing, thereby increasing penetration rate without excessive structural complexity
Solution Approach 2:
The tool incorporates multiple independently actuatable cutting elements that can be controlled separately. This segmentation allows different cutting elements to perform different functions (crushing, gouging, shearing) on different sections of the borehole, optimizing penetration rate while maintaining manageable system complexity through modular control
2Duration of action of stationary object
If conventional fixed-cutter tools continuously engage the formation, then the tool structure is simple, but cutting elements experience excessive wear on hard rock layers
Solution Approach 1:
The selectively actuatable mechanism allows cutting elements to dynamically adjust their engagement with the formation. By retracting from hard rock layers that cause excessive wear and extending only when needed for breaking hard formations, the operational life of cutting elements is extended while the added complexity of the actuation mechanism is justified by the increased tool life
Solution Approach 2:
The system changes the operational parameters of cutting elements by controlling their extension and retraction timing. This parameter control optimizes the balance between cutting effectiveness and wear prevention, extending elements for crushing/gouging actions on hard formations and retracting for shearing actions, thereby extending operational life despite the added actuation system complexity
3Productivity
If hydraulic fracturing devices are added to initiate and propagate cracks, then rock removal efficiency is improved, but the device complexity increases
Solution Approach 1:
The hydraulic fracturing device is integrated with the existing earth-boring tool and selectively actuatable cutting elements. The fluid injection system is combined with the mechanical cutting system, allowing crack initiation and propagation to work synergistically with the cutting elements, thereby improving rock removal efficiency while minimizing additional complexity through integration rather than separate systems
Solution Approach 2:
Hydraulic fluid acts as an intermediary substance that facilitates crack initiation and propagation in the rock formation. The fluid is injected through the hydraulic fracturing device to create and extend cracks, making rock removal easier for the cutting elements. This intermediary approach improves rock removal efficiency without requiring direct mechanical modification of the cutting elements, thus limiting the increase in device complexity
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 enhances the rate of penetration and reduces wear on cutting elements by allowing for targeted crack initiation and propagation, improving the tool's ability to handle hard formations and extending its operational life.
Implementation Method 1
activating a selectively activatable hydraulic fracturing device secured to the earth-boring tool to impact an underlying earth formation with a fluid from the selectively activatable hydraulic fracturing device. A crack may be at least one of initiated or propagated in a portion of the underlying earth formation utilizing the fluid
Data Source
AI summary
Method of operating earth-boring tools may involve activating a selectively activatable hydraulic fracturing device secured to the earth-boring tool to impact an underlying earth formation with a fluid from the selectively activatable hydraulic fracturing device. A crack may be at least one of initiated or propagated in a portion of the underlying earth formation utilizing the fluid in response to activation of the selectively activatable hydraulic fracturing device. The selectively activatable hydraulic fracturing device may be subsequently deactivated. Earth-boring tools may include a selectively activatable hydraulic fracturing device configured to transition between an activated state in which fluid is permitted to flow through the selectively activatable hydraulic fracturing device to engage with an underlying earth formation and a deactivated state in which fluid does not flow through the selectively activatable hydraulic fracturing device. The selectively activatable hydraulic fracturing device may be configured to at least one of initiate or propagate cracks.