Hydrojet Rotary Drill Bit Tangential Nozzle Torque
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Solution Overview
Problem
Conventional drill bits face issues such as low rate of penetration, frequent bit failures, and reduced bit life due to heat stress and erosion, particularly in hard formations and deep wells, where the existing hydraulic designs are inefficient in cooling and cleaning the cutters.
Innovation Solution
A rotary drill bit design featuring radially extending ribs with flow channels and conical nozzles that direct high-speed fluid jets tangentially to the cutting elements, providing effective cooling, cleaning, and torque, while reducing thermal stress and erosion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If conventional hydraulic designs are used to cool and clean cutters, then the drill bit can operate, but the cooling and cleaning efficiency is insufficient leading to heat stress and erosion
Solution Approach 1:
The drill bit divides the cooling and cleaning function into multiple separate nozzles positioned at different locations around the bit body. Each nozzle targets specific cutting elements, allowing optimized cooling and cleaning for each cutter rather than using a single general-purpose hydraulic system.
Solution Approach 2:
The hydraulic system provides localized cooling and cleaning by positioning nozzles in direct proximity to each cutting element. The fluid jets are directed precisely at the cutter-rock interface and cutter surface, concentrating the cooling and cleaning effect exactly where heat stress and erosion occur most intensely.
2Temperature
If high-pressure fluid jets are directed at cutting elements for cooling and cleaning, then cutter temperature and erosion are reduced, but additional torque is required to maintain rotation
Solution Approach 1:
The hydraulic system converts the potentially harmful reactive force from high-pressure fluid jets into a beneficial effect. By positioning nozzles to direct fluid jets tangentially in the direction of rotation, the reactive force generates additional torque that assists the drive system, transforming what would normally be a destabilizing force into a power-enhancing mechanism.
Solution Approach 2:
The system uses hydraulic pressure to generate both the cooling/cleaning function and the rotational force. High-pressure fluid is pumped through nozzles where it expands and reacts against the drill bit structure to produce torque, eliminating the need for separate mechanical transmission of rotational force and reducing overall system complexity.
3Device complexity
If conventional nozzle designs are used, then the hydraulic system is simple, but the jets do not effectively reach or cool the cutting elements
Solution Approach 1:
The nozzle design transitions from simple axial or radial positioning to three-dimensional spatial arrangement with multiple nozzles at different heights, angles, and radial distances from the bit center. This multi-dimensional configuration allows fluid jets to reach cutting elements at various positions around the bit perimeter, ensuring comprehensive coverage and effective cooling of all cutters simultaneously.
Solution Approach 2:
The hydraulic system is designed to adapt to the dynamic conditions of drilling by positioning nozzles to account for the rotational motion and varying load conditions. The fluid jet direction and pressure can be optimized to maintain effective cooling and cleaning throughout the rotation cycle, ensuring consistent performance despite changing operational parameters.
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
The design enhances the rate of penetration, extends bit life, and reduces maintenance needs by maintaining cutter sharpness and rigidity through efficient cooling and debris removal, allowing for longer drilling intervals with improved drilling efficiency and reduced costs.
Implementation Method 1
conical nozzles that direct high-speed fluid jets tangentially to the cutting elements, providing effective cooling, cleaning, and torque
Implementation Method 2
The fluid flow is outputting tangentially to the circumference of bit body through a plurality of conical flow nozzles to the respective plurality of cutting elements
Implementation Method 3
directing high-speed fluid jets from nozzle to a respective one of the plurality of cutting elements to clean and cool the cutting element
Implementation Method 4
wherein the rib's manifold positioning each of the plurality nozzles on an opposite side of the cutters (backside to the cutters) to create the torque in the same direction as applied to the drill bit
Data Source
AI summary
A hydrojet rotary drill bit (10) is provided for drilling a hole in a subsurface formation. The bit body (12) includes a plurality of axially extending ribs (16a, b, c, d, e, and f) and a flow channel between adjacent ribs. A plurality of cutting elements are fixedly mounting on a respective one of the plurality of ribs. A plurality of flow nozzles (20a, b, c, d, e, and f) made on respective one of the plurality of ribs to direct fluid (mud) to a respective one of the plurality of cutting elements to clean and cool the cutting elements.