Coring Cutting Element Orientation for Hard Formation Drilling
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional drill bits are inefficient for drilling through hard and abrasive formations, such as sandstone, and require frequent replacement, leading to increased drilling time and costs due to their limited durability and rate of penetration (ROP).
Innovation Solution
A fixed cutter drill bit design featuring a bit body with radially extending blades and coring cutting elements oriented at specific angles to enhance cutting efficiency, allowing for the formation of core sample fragments and improved penetration in various formation hardnesses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional drill bits are used to drill through hard and abrasive formations, then drilling can proceed, but the rate of penetration is slow and bit life is short
Solution Approach 1:
The patent applies local quality by differentiating the cutting elements at different radial positions. The first radial position cutting elements are specifically oriented to cut the core with a coring angle less than the inner cone angle, while other cutting elements are configured for bottom hole cutting. This localized optimization of cutting element orientation at the core-cutting position improves both penetration rate and bit life when drilling through hard and abrasive formations.
2Productivity
If conventional cutting element orientation is used, then the bit can cut the formation, but core sample fragmentation is insufficient
Solution Approach 1:
The patent implements local quality by providing cutting elements at the first radial position with a specific coring angle orientation that is less than the inner cone angle. This localized angular differentiation enables effective core sample fragmentation while maintaining ease of operation, as the core cuts are specifically optimized at this position without compromising the overall bit performance.
3Productivity
If frequent bit replacements are performed, then drilling can continue, but drilling time and costs increase
Solution Approach 1:
The patent applies parameter changes by optimizing the coring angle of cutting elements at the first radial position to be less than the inner cone angle. This parameter optimization enables the bit to effectively handle hard and abrasive formations, thereby extending bit life and reducing the frequency of replacements. The result is improved drilling continuity and reduced drilling time and costs.
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 drill bit achieves faster drilling and longer bit life by effectively cutting through both core samples and hard formations, reducing the need for frequent bit replacements and lowering drilling costs through optimized cutting element orientation and design.
Implementation Method 1
the rotating bit engages the earthen formation causing the bit to cut through the formation material by either abrasion, fracturing, or shearing action
Implementation Method 2
the rotating bit engages the earthen formation causing the bit to cut through the formation material
Data Source
AI summary
A fixed cutter drill bit may include a bit body having a bit centerline a plurality of blades extending radially from the bit body, and a plurality of flow courses between the plurality of blades. Each of the plurality of blades is spaced a radial distance from the bit centerline to define a core-forming region. A plurality of cutting elements is disposed on the plurality of blades, and the plurality of cutting elements include at least one coring cutting element disposed on at least one of the plurality of blades. The at least one coring cutting element is the radially innermost cutting element on the plurality of blades, and a coring angle of the at least one coring cutting element is less than an inner cone angle thereof.