Drilling Tool Ring Bit Retention and Extraction Mechanism
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Solution Overview
Problem
Existing drilling tools with ring bits and inner bits face inefficiencies in drilling through hard formations, as they require larger diameters for the casing pipe and ring bit, leading to economic inefficiencies and risk of the ring bit falling off during drilling.
Innovation Solution
A drilling tool with a cylindrical casing pipe and an annular ring bit, featuring latching and pull-out mechanisms that allow the ring bit to be securely attached and easily removed, enabling the formation of holes with consistent diameters without the need for the casing pipe, thereby reducing the diameter of the drilling tool and preventing ring bit dropout.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the casing pipe and ring bit are used together for drilling, then the drilling can be performed in soft formations, but the outer diameter of the member inserted through the casing pipe is limited by the inner diameter of the casing pipe, leading to economic inefficiency
Solution Approach 1:
The drilling system is segmented into two distinct phases: first drilling with the casing pipe and ring bit together to establish the hole, then removing the ring bit to allow insertion of a larger diameter member through the casing pipe. This segmentation resolves the contradiction by separating the functions of hole formation and member insertion.
Solution Approach 2:
The casing pipe and ring bit are used together in a preliminary drilling phase to create the initial hole and stabilize the formation. After this preliminary action is complete, the ring bit is removed to enable the subsequent insertion of larger diameter members, thus resolving the diameter limitation issue.
2Quantity of substance
If the ring bit is made detachable from the casing pipe, then the ring bit can be removed for inserting larger members, but the ring bit may fall off during drilling operations
Solution Approach 1:
The connection between the ring bit and casing pipe is made dynamic rather than static. The ring bit can be attached when needed for drilling and detached when needed for member insertion. This dynamic connection resolves the contradiction between removability and retention.
Solution Approach 2:
A coupling mechanism acts as an intermediary between the ring bit and casing pipe, providing secure attachment during drilling while allowing controlled removal. This intermediary connection resolves the contradiction by mediating between the opposing requirements of retention and removability.
3Ease of operation
If the inner bit is pulled out from the casing pipe after drilling, then the member can be inserted, but the outer diameter of the member is limited to less than the inner diameter of the casing pipe
Solution Approach 1:
The ring bit is extracted or removed from the casing pipe after the initial drilling phase is complete. This extraction enables the insertion of members with larger outer diameters that would not fit if the ring bit remained in place, thus resolving the diameter limitation contradiction.
Solution Approach 2:
The ring bit performs its drilling function as a preliminary action, then is removed to enable the main function of inserting larger diameter members. This preliminary action approach resolves the contradiction by separating the temporary drilling need from the permanent member insertion requirement.
4Productivity
If the ring bit and inner bit are used together for drilling, then the first hole can be formed, but the second hole formed without the casing pipe has a smaller inner diameter
Solution Approach 1:
The drilling operation is segmented into two phases: first hole formation using both casing pipe and ring bit, then second hole formation using only the ring bit after its removal from the casing pipe. This segmentation allows optimization of each phase for its specific purpose while maintaining overall productivity and diameter consistency.
Solution Approach 2:
The system transitions dynamically from a two-component drilling configuration to a single-component configuration. This dynamic adjustment allows the ring bit to be optimally positioned for drilling the second hole with consistent diameter while maintaining the productivity benefits of the initial two-component system.
Data Source
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AI summary
There are provided a drilling tool and a drilling method, the drilling tool including a ring bit 4 inserted into a tip portion of a casing pipe (1) to be rotatable around an axis line, and latched in a tip side in the direction of an axis line (O) by a latching means (7) and mounted to be moved in the direction of the axis line (O); an inner bit (5) inserted into the casing pipe (1) to be contacted toward the tip side of the casing pipe (1) and the ring bit (4), the said inner bit being engaged around the axis line (O) by an engaging means with respect to the ring bit (4); and a pull-out mechanism which pulls out the ring bit (4) to the tip side with respect to the casing pipe (1) in the latching means (7).