Alternating Side Rake Cutter Drill Bit Stabilization
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Prior art fixed cutter drill bits often exhibit unstable drilling motion, leading to larger than desired holes and cutting structure problems, particularly in various operating windows, which results in reduced drilling efficiency and increased stress on drilling equipment.
Innovation Solution
A fixed cutter stabilizing drill bit design featuring alternating rows of cutters with varying side rake angles, where a first subset is oriented at a negative side rake angle and a second subset at zero or slightly positive side rake angle, with the absolute value of the negative side rake angles decreasing as distance from the center increases, enhancing stability and drilling efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If conventional fixed cutter drill bit design is used, then manufacturing is simpler, but drilling stability deteriorates leading to unstable drilling motion
Solution Approach 1:
The cutters are divided into different subsets based on their side rake angles. The first subset has cutters with negative side rake angles while the second subset has cutters with zero or positive side rake angles. This segmentation allows each subset to perform specific functions that collectively improve drilling stability.
Solution Approach 2:
Different regions of the drill bit have cutters with different side rake angle characteristics. The alternating pattern of negative and zero/positive side rake angle cutters creates local variations in cutting behavior that stabilize the drilling process across different operating conditions.
2Productivity
If conventional cutter orientation is used, then device complexity is lower, but drilling efficiency deteriorates
Solution Approach 1:
The alternating pattern of cutters with different side rake angles creates a dynamic cutting action that adapts to varying operating conditions. This dynamic configuration maintains optimal cutting performance across different drilling parameters and rock types.
Solution Approach 2:
The alternating arrangement of negative and zero/positive side rake angle cutters creates a periodic cutting pattern as the drill bit rotates. This periodic action helps maintain consistent drilling efficiency by periodically varying the cutting engagement characteristics.
Data Source
AI summary
A bit for drilling a wellbore includes: a body; and a cutting face including: a blade protruding from the body; and a row of cutters, each cutter including: a substrate mounted in a pocket formed adjacent to a leading edge of the blade; and a cutting table made from a superhard material, mounted to the substrate, and having a working face. A first subset of the row of cutters is oriented at a negative side rake angle. A second subset of the row of cutters is oriented at a zero or slightly positive side rake angle. The first and the second subsets are alternating. An innermost cutter of the first subset has a maximum absolute value of the negative side rake angle. The absolute value negative side rake angles of the rest of the cutters decrease as their distance from a center of the cutting face increases.