Cutting Insert with Turning and Milling Portions for Casing
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Solution Overview
Problem
Current methods for removing casing in oil and gas wells during abandonment or slot recovery operations are inefficient, as existing section milling tools lack effective mechanisms for both radial and axial cutting, leading to incomplete removal and increased operational time.
Innovation Solution
A section mill with movable blades and cutting inserts that include both turning and milling portions, allowing for radial initiation and axial extension of cuts, enabling efficient cutting and milling of casing by rotating and pivoting to engage the casing effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If existing section milling tools are used, then the milling operation can be performed, but the cutting is incomplete and operational time increases
Solution Approach 1:
The cutting insert is divided into two distinct functional portions: a turning portion with radially-oriented cutting edges for initiating cutouts, and a milling portion with axially-oriented cutting edges for extending cuts. This segmentation allows each portion to specialize in its optimal cutting direction, resolving the inefficiency of single-function tools that cannot complete cuts properly.
Solution Approach 2:
The cutting insert integrates both turning and milling capabilities into a single multi-functional component. The turning portion handles radial cutting to initiate cutouts, while the milling portion handles axial cutting to extend the cut along the casing. This multi-functionality eliminates the need for multiple separate tools or operations, directly improving productivity and reducing operational time.
2Reliability
If section mill blades are expanded radially outward, then the blades engage the casing, but without proper cutting features the cut is incomplete
Solution Approach 1:
Different regions of the cutting insert are given different cutting characteristics: the turning portion has radially-oriented cutting edges optimized for initiating cutouts by cutting radially into the casing, while the milling portion has axially-oriented cutting edges optimized for extending the cut axially along the casing. This local differentiation ensures reliable cut completion by providing the right cutting features at the right locations.
Data Source
AI summary
A milling tool includes a cutting insert coupled to a movable blade. The movable blade may change from a retracted to an expanded state to engage and cut downhole casing. A cutout initiation region of the movable blade makes contact with the downhole casing, and cutting inserts with turning portions designed to cut in a turning manner may be located in the cutout initiation region. Cutting inserts with milling portions designed to cut in a face-milling manner may be located outside the cutout initiation region. Some cutting inserts may include both turning portions and milling portions.