Casing Driver With Segmented Drill Stem Connections
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Solution Overview
Problem
The limitation of typical casing connections in drilling rigs restricts pile depth to the length of the drill stem extending above the rotary, preventing the use of different casing lengths on a full-length drill stem.
Innovation Solution
A casing driver connected to different points on the drill stem allows the rotary drive to be connected only to the drill stem, enabling the use of varying casing lengths and extending the drilling depth beyond the tip of the casing without dissembling the drill stem.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the rotary drive is connected directly to both the drill stem and the casing, then the connection is simple and direct, but the pile depth is limited to the length of the drill stem extending above the rotary
Solution Approach 1:
The connection system is segmented into two separate connection points: one between the rotary drive and the drill stem, and another between the drill stem and the casing. This allows independent control and movement of the drill stem and casing, enabling the drill stem to be extended beyond the rotary while maintaining connection to the casing through the drill stem connection point.
2Length of moving object
If the drill stem is extended beyond the rotary to achieve greater depth, then the drilling depth increases, but the casing cannot be accommodated on the extended portion
Solution Approach 1:
The system is made dynamic by allowing the drill stem to move independently relative to the casing. The drill stem can be extended beyond the rotary drive while the casing remains connected at a lower point, creating a dynamic configuration where the drill stem acts as both a drilling tool and a support structure for the casing at different depths.
3Adaptability or versatility
If different casing lengths are used for varying soil conditions, then the adaptability to different soil conditions improves, but the drill stem must be disassembled and reassembled
Solution Approach 1:
The drill stem is prepared in advance with multiple connection points along its length. This preliminary configuration allows different length casings to be connected to the same drill stem without disassembly, as the required connection point is already positioned and ready to receive the casing of the appropriate length.
Data Source
AI summary
An apparatus and method are provided for using a rotary drive of a drilling rig to drive both the drill stem and the casing simultaneously, by connecting the drill stem to the casing using a drive head. Subsequently, after drilling a first length of bore, the drive head may be removed and the drill stem driven by the rotary drive independently from the casing, allowing the bore to be extended further without moving the casing.