High-Pressure Fluid Jet Drill Bit for Erosion-Resistant Drilling
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Solution Overview
Problem
Conventional drilling bits face challenges in efficiently removing material from formations while maintaining reliability and operational lifetime, as increasing mechanical force and fluid pressure can lead to erosion and reduced bit performance.
Innovation Solution
The integration of a high-pressure fluid conduit within the bit body, capable of withstanding pressures greater than 40 kpsi, to direct a high-pressure fluid jet for material removal, combined with a low-pressure conduit for debris flushing, reduces mechanical force requirements and enhances bit durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If fluid pressure is increased to improve material removal efficiency, then penetration rate increases, but bit erosion increases and reliability decreases
Solution Approach 1:
The bit is divided into separate functional zones: a cutting element zone for mechanical cutting and a fluid jet zone for high-pressure fluid delivery. This segmentation allows the fluid conduit to be positioned away from the cutting elements, reducing erosion at the cutting interface while maintaining high penetration rates through the fluid jet's weakening action on the formation.
Solution Approach 2:
A fluid jet acts as an intermediary between the drilling system and the formation. The high-pressure fluid jet first weakens the formation material, making it more susceptible to removal by the cutting elements. This intermediary action allows mechanical cutting to operate at lower forces, reducing bit erosion and improving reliability while maintaining high penetration rates.
2Productivity
If mechanical force is increased to remove material from formation, then material removal efficiency improves, but torque and weight on bit increase
Solution Approach 1:
The patent replaces direct mechanical force application with a fluid-based system. High-pressure fluid jets are used to weaken and remove formation material, substituting the need for high mechanical torque and weight on the bit. This allows efficient material removal while reducing the mechanical load on the drilling system.
Solution Approach 2:
The invention employs hydraulic principles by using high-pressure fluid jets to perform the work of mechanical cutting. The fluid pressure (greater than 40 kpsi) provides the force needed to weaken and remove formation material, eliminating the need for proportionally high mechanical forces that would increase torque and weight on the bit.
3Productivity
If fluid pressure is increased to improve penetration rate, then cutting efficiency improves, but bit body erosion increases
Solution Approach 1:
The bit is designed with localized functional zones: cutting elements positioned for mechanical cutting and fluid conduits positioned to deliver high-pressure fluid away from the cutting interface. This local differentiation allows high fluid pressure to be applied where it weakens the formation, while the cutting elements operate in a lower-erosion environment, reducing overall bit body erosion.
Solution Approach 2:
The high-pressure fluid jet performs a preliminary action by weakening the formation material before the cutting elements make contact. This pre-softening of the formation reduces the mechanical stress and erosion on the bit body during the actual cutting operation, while still achieving high penetration rates through the combined action of fluid weakening and mechanical removal.
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 increases penetration rate and reduces the likelihood of cutting element and bit body failure, thereby improving drilling efficiency and extending the bit's operational life.
Implementation Method 1
directing the fluid at the formation in a fluid jet, weakening the formation with the fluid jet to create a weakened region of the formation
Implementation Method 2
Increasing the fluid pressure in a conventional bit erodes the bit and decreases the reliability and operational lifetime of the bit
Data Source
AI summary
A cutting bit includes a bit body and high-pressure body with a high-pressure fluid conduit therethrough. The high-pressure body and bit body are joined together. The high-pressure fluid conduit is configured to convey a fluid at greater than 14.5 ksi, and in some embodiments greater than 40 ksi. The high-pressure fluid conduit may direct the fluid through a nozzle in a fluid jet to weaken material, such as an earth formation. The cutting bit includes at least one roller cone and/or blades with cutting elements thereon to remove the weakened material. A cutting bit includes both high and low-pressure fluid conduits, and high and low-pressure fluid nozzles. The high-pressure nozzles receive fluid flow from a downhole pressure intensifier, and a connection between the bit and the downhole pressure intensifier includes rigid connectors, flexible connectors, or a combination thereof.