Flow Guide Drill Bit for Cooling and Cleaning
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Solution Overview
Problem
Fixed cutter drill bits face inadequate cooling and cleaning of cutting elements due to reduced drilling fluid velocity, leading to increased erosion, wear, and 'bit balling' in difficult formations like plastic shales, which hampers drilling efficiency.
Innovation Solution
The design incorporates flow guides that extend along the leading face of fixed blades, directing drilling fluid to form a continuous flow channel with cutting elements, increasing hydraulic shear stress and enhancing fluid acceleration, thereby improving fluid dynamics and cutting element engagement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If nozzles are oriented to direct high velocity drilling fluid toward the formation at the bottom of the hole, then the drilling fluid effectively removes formation cuttings from the bit face, but the velocity of the drilling fluid is reduced by the time it contacts the cutting elements, limiting cooling and cleaning effectiveness
Solution Approach 1:
The invention segments the drilling fluid flow path by introducing flow guides that create separate flow channels. One channel directs fluid to cool cutting elements while another directs fluid to clean the bit face, allowing simultaneous optimization of both functions without velocity loss
Solution Approach 2:
Flow guides act as intermediary structures between the nozzles and the cutting elements/bit face. These guides redirect and maintain fluid velocity, serving as mediators that preserve the high velocity needed for both cooling and cleaning functions
2Area of stationary object
If drilling fluid velocity is reduced after impacting the formation, then the fluid has traveled sufficient distance to clean the bit face, but the reduced velocity limits the amount of cooling and cleaning that can be achieved by the drilling fluid
Solution Approach 1:
The flow guides introduce a new spatial dimension to the fluid flow by creating three-dimensional flow channels with specific geometries. This allows the fluid to maintain velocity while changing direction and covering different areas, decoupling the relationship between travel distance and velocity loss
3Productivity
If flow guides are added to direct drilling fluid along the leading face of fixed blades, then hydraulic shear stress and fluid acceleration are increased, but the device complexity increases
Solution Approach 1:
The flow guides are merged with the existing drill bit structure, specifically integrating them with the fixed blades and nozzle assembly. This combining approach allows the flow guidance function to be added without requiring completely separate components, thereby reducing 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 configuration enhances the drilling fluid's ability to cool and clean cutting elements, reducing erosion, wear, and 'bit balling, resulting in increased drilling efficiency and rate of penetration, especially in challenging formations like shale.
Implementation Method 1
Each of the plurality of flow guides may increase hydraulic shear stress on a plurality of cutting elements disposed on each of the plurality of fixed blades
Implementation Method 2
The drilling fluid may be accelerated in the continuous flow channel
Implementation Method 3
The drilling fluid acts to cool the bit and remove formation cuttings from the bit face and the bottom of the borehole
Implementation Method 4
The drilling fluid acts to cool the bit and remove formation cuttings from the bit face
Implementation Method 5
The drilling fluid acts to cool the bit and remove formation cuttings from the bit face
Data Source
AI summary
A drill bit comprises a bit body having a body face. A plurality of fixed blades extends from the bit body. Each of the plurality of fixed blades has a leading face and a trailing face. A plurality of nozzles is disposed on the body face to flow drilling fluid out of the bit body. A plurality of flow guides direct a portion of the drilling fluid away from the bit body. Each of the plurality of flow guides extends longitudinally from the body face, and along the leading face of one of the plurality of fixed blades.