Modular Top Drive Segmented Coupling for Drilling Casing Switching
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Solution Overview
Problem
The existing top drive systems for drilling and casing operations are time-consuming and dangerous, requiring rig personnel to work at heights and have limited load capacity due to threaded connections, which complicates the transition between drilling and casing modes.
Innovation Solution
A modular top drive system with a rail and motor unit, including a pipe handler with bails, slide hinge, and linear actuator, allows for the alignment and connection of drilling and casing units with the motor unit, enabling efficient switching between modes and increased load capacity through a more secure and stable connection mechanism.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a threaded connection is used between the quill and gripping head for adapting to casing string, then the top drive can switch between drilling and casing modes, but the load capacity is unduly limited and the transition is time-consuming
Solution Approach 1:
The top drive is divided into separate functional modules: a drilling unit with quill for drilling operations and a casing unit with gripping head for casing operations. These modules can be independently connected to the motor unit through different coupling mechanisms, allowing mode switching without compromising load capacity. The segmentation enables each module to be optimized for its specific function while maintaining overall system versatility.
2Adaptability or versatility
If rig personnel manually handle the transition between drilling and casing modes, then the top drive can adapt to different operations, but the process is time-consuming and dangerous requiring work at heights
Solution Approach 1:
The top drive incorporates automated coupling mechanisms that enable self-service mode transitions. The drilling unit and casing unit are equipped with automatic coupling devices that can connect to and disconnect from the motor unit without manual intervention. This automation reduces transition time and eliminates the need for personnel to work at heights during mode changes, while maintaining operational flexibility.
3Stability of the object's composition
If the top drive uses a fixed connection structure for drilling operations, then the drilling function is stable, but the structure cannot accommodate casing operations without compromising stability
Solution Approach 1:
The top drive employs dynamic connection structures that can adapt between drilling and casing modes. The motor unit is equipped with interchangeable coupling mechanisms that provide stable connections for both operations. The drilling unit uses a quill coupling system optimized for drilling stability, while the casing unit uses a gripping head coupling system optimized for casing operations. Both coupling systems maintain structural stability in their respective operational contexts.
Data Source
Figure 1
Figure 2A
Figure 2B~2C
AI summary
A modular top drive (1) for construction of a wellbore includes a rail (2), a motor unit (1m) and a pipe handler (1h). The motor unit includes: a body (20), a drive motor (15), a trolley (22) connecting the body to the rail; and a first latch for selectively connecting either a drilling unit (1d) or a casing unit (1c) to the motor unit (1m). The pipe handler (1h) comprising a pair of bails (102b), a slide hinge (12) pivotally connecting the bails to the rail and a linear actuator (1a) for moving the slide hinge relative to the motor unit to a loading position. The top drive further includes a bracket (5, 6) for holding any one of a drilling (1d), casing (1c), and cementing unit (1s) and movable relative to the rail between a standby position and a connection position.